UBUNTU-CVE-2026-86805

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-86805
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86805.json
JSON Data
https://api.osv.dev/v1/vulns/UBUNTU-CVE-2026-86805
Upstream
Published
2026-09-22T16:18:00Z
Modified
2026-09-24T02:00:38Z
Severity
  • 6.3 (Medium) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:L/UI:R/S:U/C:H/I:H/A:L CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

A time-of-check to time-of-use (TOCTOU) race condition in the dynamic loader (ld.so) of the GNU C Library (glibc) versions 2.14 through 2.44 allows a local attacker to escalate privileges. When expanding $ORIGIN in DT_RPATH for setuid/setgid (AT_SECURE) programs, glibc validates the lexically normalized search path against the trusted directories but then opens the raw, un-normalized path. On systems where the Linux fs.protected_hardlinks sysctl is disabled, a local attacker who hard-links such a program into an attacker-controlled directory and wins a race to replace an intermediate path component with a symbolic link can direct the loader outside the trusted directory, causing it to load an attacker-controlled shared object and execute arbitrary code with the elevated privileges of the program. Exploitation requires an installed setuid or setgid binary whose DT_RPATH uses $ORIGIN followed by ".." traversal that normalizes into a trusted directory, and the ability to hard-link that binary and win the race by swapping a path component for a symbolic link. Major Linux-based OS distributions ship with fs.protected_hardlinks enabled by default and mitigate the vulnerability.

References

Affected packages

Ubuntu:22.04:LTS
glibc

Package

Name
glibc
Purl
pkg:deb/ubuntu/glibc?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.34-0ubuntu3
2.35-0ubuntu1
2.35-0ubuntu3
2.35-0ubuntu3.1
2.35-0ubuntu3.3
2.35-0ubuntu3.4
2.35-0ubuntu3.5
2.35-0ubuntu3.6
2.35-0ubuntu3.7
2.35-0ubuntu3.8
2.35-0ubuntu3.9
2.35-0ubuntu3.10
2.35-0ubuntu3.11
2.35-0ubuntu3.12
2.35-0ubuntu3.13
2.35-0ubuntu3.14
2.35-0ubuntu3.15

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "glibc-source",
            "binary_version":  "2.35-0ubuntu3.15"
        },
        {
            "binary_name":  "libc-bin",
            "binary_version":  "2.35-0ubuntu3.15"
        },
        {
            "binary_name":  "libc-dev-bin",
            "binary_version":  "2.35-0ubuntu3.15"
        },
        {
            "binary_name":  "libc-devtools",
            "binary_version":  "2.35-0ubuntu3.15"
        },
        {
            "binary_name":  "libc6",
            "binary_version":  "2.35-0ubuntu3.15"
        },
        {
            "binary_name":  "libc6-amd64",
            "binary_version":  "2.35-0ubuntu3.15"
        },
        {
            "binary_name":  "libc6-dev-amd64",
            "binary_version":  "2.35-0ubuntu3.15"
        },
        {
            "binary_name":  "libc6-dev-i386",
            "binary_version":  "2.35-0ubuntu3.15"
        },
        {
            "binary_name":  "libc6-dev-s390",
            "binary_version":  "2.35-0ubuntu3.15"
        },
        {
            "binary_name":  "libc6-dev-x32",
            "binary_version":  "2.35-0ubuntu3.15"
        },
        {
            "binary_name":  "libc6-i386",
            "binary_version":  "2.35-0ubuntu3.15"
        },
        {
            "binary_name":  "libc6-prof",
            "binary_version":  "2.35-0ubuntu3.15"
        },
        {
            "binary_name":  "libc6-s390",
            "binary_version":  "2.35-0ubuntu3.15"
        },
        {
            "binary_name":  "libc6-x32",
            "binary_version":  "2.35-0ubuntu3.15"
        },
        {
            "binary_name":  "locales",
            "binary_version":  "2.35-0ubuntu3.15"
        },
        {
            "binary_name":  "locales-all",
            "binary_version":  "2.35-0ubuntu3.15"
        },
        {
            "binary_name":  "nscd",
            "binary_version":  "2.35-0ubuntu3.15"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86805.json"
Ubuntu:24.04:LTS
glibc

Package

Name
glibc
Purl
pkg:deb/ubuntu/glibc?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.38-1ubuntu6
2.38-3ubuntu1
2.39-0ubuntu1
2.39-0ubuntu2
2.39-0ubuntu6
2.39-0ubuntu8
2.39-0ubuntu8.1
2.39-0ubuntu8.2
2.39-0ubuntu8.3
2.39-0ubuntu8.4
2.39-0ubuntu8.5
2.39-0ubuntu8.6
2.39-0ubuntu8.7
2.39-0ubuntu8.8
2.39-0ubuntu8.9

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "glibc-source",
            "binary_version":  "2.39-0ubuntu8.9"
        },
        {
            "binary_name":  "libc-bin",
            "binary_version":  "2.39-0ubuntu8.9"
        },
        {
            "binary_name":  "libc-dev-bin",
            "binary_version":  "2.39-0ubuntu8.9"
        },
        {
            "binary_name":  "libc-devtools",
            "binary_version":  "2.39-0ubuntu8.9"
        },
        {
            "binary_name":  "libc6",
            "binary_version":  "2.39-0ubuntu8.9"
        },
        {
            "binary_name":  "libc6-amd64",
            "binary_version":  "2.39-0ubuntu8.9"
        },
        {
            "binary_name":  "libc6-dev-amd64",
            "binary_version":  "2.39-0ubuntu8.9"
        },
        {
            "binary_name":  "libc6-dev-i386",
            "binary_version":  "2.39-0ubuntu8.9"
        },
        {
            "binary_name":  "libc6-dev-s390",
            "binary_version":  "2.39-0ubuntu8.9"
        },
        {
            "binary_name":  "libc6-dev-x32",
            "binary_version":  "2.39-0ubuntu8.9"
        },
        {
            "binary_name":  "libc6-i386",
            "binary_version":  "2.39-0ubuntu8.9"
        },
        {
            "binary_name":  "libc6-s390",
            "binary_version":  "2.39-0ubuntu8.9"
        },
        {
            "binary_name":  "libc6-x32",
            "binary_version":  "2.39-0ubuntu8.9"
        },
        {
            "binary_name":  "locales",
            "binary_version":  "2.39-0ubuntu8.9"
        },
        {
            "binary_name":  "locales-all",
            "binary_version":  "2.39-0ubuntu8.9"
        },
        {
            "binary_name":  "nscd",
            "binary_version":  "2.39-0ubuntu8.9"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86805.json"
Ubuntu:26.04:LTS
glibc

Package

Name
glibc
Purl
pkg:deb/ubuntu/glibc?arch=source&distro=resolute

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.42-0ubuntu3
2.42-2ubuntu1
2.42-2ubuntu2
2.42-2ubuntu4
2.42-2ubuntu5
2.43-2ubuntu1
2.43-2ubuntu2
2.43-2ubuntu2.3
2.43-2ubuntu2.4

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "glibc-source",
            "binary_version":  "2.43-2ubuntu2.4"
        },
        {
            "binary_name":  "libc-bin",
            "binary_version":  "2.43-2ubuntu2.4"
        },
        {
            "binary_name":  "libc-dev-bin",
            "binary_version":  "2.43-2ubuntu2.4"
        },
        {
            "binary_name":  "libc-devtools",
            "binary_version":  "2.43-2ubuntu2.4"
        },
        {
            "binary_name":  "libc-gconv-modules-extra",
            "binary_version":  "2.43-2ubuntu2.4"
        },
        {
            "binary_name":  "libc6",
            "binary_version":  "2.43-2ubuntu2.4"
        },
        {
            "binary_name":  "libc6-amd64",
            "binary_version":  "2.43-2ubuntu2.4"
        },
        {
            "binary_name":  "libc6-dev-amd64",
            "binary_version":  "2.43-2ubuntu2.4"
        },
        {
            "binary_name":  "libc6-dev-i386",
            "binary_version":  "2.43-2ubuntu2.4"
        },
        {
            "binary_name":  "libc6-dev-x32",
            "binary_version":  "2.43-2ubuntu2.4"
        },
        {
            "binary_name":  "libc6-i386",
            "binary_version":  "2.43-2ubuntu2.4"
        },
        {
            "binary_name":  "libc6-x32",
            "binary_version":  "2.43-2ubuntu2.4"
        },
        {
            "binary_name":  "locales",
            "binary_version":  "2.43-2ubuntu2.4"
        },
        {
            "binary_name":  "locales-all",
            "binary_version":  "2.43-2ubuntu2.4"
        },
        {
            "binary_name":  "nscd",
            "binary_version":  "2.43-2ubuntu2.4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86805.json"
Ubuntu:Pro:14.04:LTS
eglibc

Package

Name
eglibc
Purl
pkg:deb/ubuntu/eglibc?arch=source&distro=esm-infra-legacy%2Ftrusty

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.17-93ubuntu4
2.18-0ubuntu1
2.18-0ubuntu2
2.18-0ubuntu4
2.18-0ubuntu5
2.18-0ubuntu6
2.18-0ubuntu7
2.19-0ubuntu2
2.19-0ubuntu3
2.19-0ubuntu4
2.19-0ubuntu5
2.19-0ubuntu6
2.19-0ubuntu6.1
2.19-0ubuntu6.3
2.19-0ubuntu6.4
2.19-0ubuntu6.5
2.19-0ubuntu6.6
2.19-0ubuntu6.7
2.19-0ubuntu6.8
2.19-0ubuntu6.9
2.19-0ubuntu6.10
2.19-0ubuntu6.11
2.19-0ubuntu6.13
2.19-0ubuntu6.14
2.19-0ubuntu6.15
2.19-0ubuntu6.15+esm1
2.19-0ubuntu6.15+esm2
2.19-0ubuntu6.15+esm3
2.19-0ubuntu6.15+esm4

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "eglibc-source",
            "binary_version":  "2.19-0ubuntu6.15+esm4"
        },
        {
            "binary_name":  "libc-bin",
            "binary_version":  "2.19-0ubuntu6.15+esm4"
        },
        {
            "binary_name":  "libc-dev-bin",
            "binary_version":  "2.19-0ubuntu6.15+esm4"
        },
        {
            "binary_name":  "libc6",
            "binary_version":  "2.19-0ubuntu6.15+esm4"
        },
        {
            "binary_name":  "libc6-amd64",
            "binary_version":  "2.19-0ubuntu6.15+esm4"
        },
        {
            "binary_name":  "libc6-armel",
            "binary_version":  "2.19-0ubuntu6.15+esm4"
        },
        {
            "binary_name":  "libc6-dev-amd64",
            "binary_version":  "2.19-0ubuntu6.15+esm4"
        },
        {
            "binary_name":  "libc6-dev-armel",
            "binary_version":  "2.19-0ubuntu6.15+esm4"
        },
        {
            "binary_name":  "libc6-dev-i386",
            "binary_version":  "2.19-0ubuntu6.15+esm4"
        },
        {
            "binary_name":  "libc6-dev-x32",
            "binary_version":  "2.19-0ubuntu6.15+esm4"
        },
        {
            "binary_name":  "libc6-i386",
            "binary_version":  "2.19-0ubuntu6.15+esm4"
        },
        {
            "binary_name":  "libc6-pic",
            "binary_version":  "2.19-0ubuntu6.15+esm4"
        },
        {
            "binary_name":  "libc6-prof",
            "binary_version":  "2.19-0ubuntu6.15+esm4"
        },
        {
            "binary_name":  "libc6-x32",
            "binary_version":  "2.19-0ubuntu6.15+esm4"
        },
        {
            "binary_name":  "multiarch-support",
            "binary_version":  "2.19-0ubuntu6.15+esm4"
        },
        {
            "binary_name":  "nscd",
            "binary_version":  "2.19-0ubuntu6.15+esm4"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86805.json"
Ubuntu:Pro:16.04:LTS
glibc

Package

Name
glibc
Purl
pkg:deb/ubuntu/glibc?arch=source&distro=esm-infra%2Fxenial

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.21-0ubuntu4
2.21-0ubuntu5
2.21-0ubuntu6
2.23-0ubuntu1
2.23-0ubuntu2
2.23-0ubuntu3
2.23-0ubuntu4
2.23-0ubuntu5
2.23-0ubuntu6
2.23-0ubuntu7
2.23-0ubuntu9
2.23-0ubuntu10
2.23-0ubuntu11
2.23-0ubuntu11.2
2.23-0ubuntu11.3
2.23-0ubuntu11.3+esm1
2.23-0ubuntu11.3+esm2
2.23-0ubuntu11.3+esm3
2.23-0ubuntu11.3+esm5
2.23-0ubuntu11.3+esm6
2.23-0ubuntu11.3+esm7
2.23-0ubuntu11.3+esm8
2.23-0ubuntu11.3+esm9

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "glibc-source",
            "binary_version":  "2.23-0ubuntu11.3+esm9"
        },
        {
            "binary_name":  "libc-bin",
            "binary_version":  "2.23-0ubuntu11.3+esm9"
        },
        {
            "binary_name":  "libc-dev-bin",
            "binary_version":  "2.23-0ubuntu11.3+esm9"
        },
        {
            "binary_name":  "libc6",
            "binary_version":  "2.23-0ubuntu11.3+esm9"
        },
        {
            "binary_name":  "libc6-amd64",
            "binary_version":  "2.23-0ubuntu11.3+esm9"
        },
        {
            "binary_name":  "libc6-armel",
            "binary_version":  "2.23-0ubuntu11.3+esm9"
        },
        {
            "binary_name":  "libc6-dev-amd64",
            "binary_version":  "2.23-0ubuntu11.3+esm9"
        },
        {
            "binary_name":  "libc6-dev-armel",
            "binary_version":  "2.23-0ubuntu11.3+esm9"
        },
        {
            "binary_name":  "libc6-dev-i386",
            "binary_version":  "2.23-0ubuntu11.3+esm9"
        },
        {
            "binary_name":  "libc6-dev-s390",
            "binary_version":  "2.23-0ubuntu11.3+esm9"
        },
        {
            "binary_name":  "libc6-dev-x32",
            "binary_version":  "2.23-0ubuntu11.3+esm9"
        },
        {
            "binary_name":  "libc6-i386",
            "binary_version":  "2.23-0ubuntu11.3+esm9"
        },
        {
            "binary_name":  "libc6-pic",
            "binary_version":  "2.23-0ubuntu11.3+esm9"
        },
        {
            "binary_name":  "libc6-s390",
            "binary_version":  "2.23-0ubuntu11.3+esm9"
        },
        {
            "binary_name":  "libc6-x32",
            "binary_version":  "2.23-0ubuntu11.3+esm9"
        },
        {
            "binary_name":  "locales",
            "binary_version":  "2.23-0ubuntu11.3+esm9"
        },
        {
            "binary_name":  "locales-all",
            "binary_version":  "2.23-0ubuntu11.3+esm9"
        },
        {
            "binary_name":  "multiarch-support",
            "binary_version":  "2.23-0ubuntu11.3+esm9"
        },
        {
            "binary_name":  "nscd",
            "binary_version":  "2.23-0ubuntu11.3+esm9"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86805.json"
Ubuntu:Pro:18.04:LTS
glibc

Package

Name
glibc
Purl
pkg:deb/ubuntu/glibc?arch=source&distro=esm-infra%2Fbionic

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.26-0ubuntu2
2.26-0ubuntu2.1
2.27-0ubuntu2
2.27-0ubuntu3
2.27-3ubuntu1
2.27-3ubuntu1.2
2.27-3ubuntu1.3
2.27-3ubuntu1.4
2.27-3ubuntu1.5
2.27-3ubuntu1.6
2.27-3ubuntu1.6+esm1
2.27-3ubuntu1.6+esm2
2.27-3ubuntu1.6+esm3
2.27-3ubuntu1.6+esm4
2.27-3ubuntu1.6+esm5
2.27-3ubuntu1.6+esm6

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "glibc-source",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        },
        {
            "binary_name":  "libc-bin",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        },
        {
            "binary_name":  "libc-dev-bin",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        },
        {
            "binary_name":  "libc6",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        },
        {
            "binary_name":  "libc6-amd64",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        },
        {
            "binary_name":  "libc6-armel",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        },
        {
            "binary_name":  "libc6-dev-amd64",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        },
        {
            "binary_name":  "libc6-dev-armel",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        },
        {
            "binary_name":  "libc6-dev-i386",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        },
        {
            "binary_name":  "libc6-dev-s390",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        },
        {
            "binary_name":  "libc6-dev-x32",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        },
        {
            "binary_name":  "libc6-i386",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        },
        {
            "binary_name":  "libc6-lse",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        },
        {
            "binary_name":  "libc6-pic",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        },
        {
            "binary_name":  "libc6-s390",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        },
        {
            "binary_name":  "libc6-x32",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        },
        {
            "binary_name":  "locales",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        },
        {
            "binary_name":  "locales-all",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        },
        {
            "binary_name":  "multiarch-support",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        },
        {
            "binary_name":  "nscd",
            "binary_version":  "2.27-3ubuntu1.6+esm6"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86805.json"
Ubuntu:Pro:20.04:LTS
glibc

Package

Name
glibc
Purl
pkg:deb/ubuntu/glibc?arch=source&distro=esm-infra%2Ffocal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0 Unknown introduced version / All previous versions are affected

Affected versions

2.*
2.30-0ubuntu2
2.30-0ubuntu3
2.31-0ubuntu5
2.31-0ubuntu6
2.31-0ubuntu7
2.31-0ubuntu9
2.31-0ubuntu9.1
2.31-0ubuntu9.2
2.31-0ubuntu9.3
2.31-0ubuntu9.7
2.31-0ubuntu9.9
2.31-0ubuntu9.12
2.31-0ubuntu9.14
2.31-0ubuntu9.15
2.31-0ubuntu9.16
2.31-0ubuntu9.17
2.31-0ubuntu9.18
2.31-0ubuntu9.18+esm1

Ecosystem specific 

{
    "binaries":  [
        {
            "binary_name":  "glibc-source",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        },
        {
            "binary_name":  "libc-bin",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        },
        {
            "binary_name":  "libc-dev-bin",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        },
        {
            "binary_name":  "libc6",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        },
        {
            "binary_name":  "libc6-amd64",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        },
        {
            "binary_name":  "libc6-armel",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        },
        {
            "binary_name":  "libc6-dev-amd64",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        },
        {
            "binary_name":  "libc6-dev-armel",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        },
        {
            "binary_name":  "libc6-dev-i386",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        },
        {
            "binary_name":  "libc6-dev-s390",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        },
        {
            "binary_name":  "libc6-dev-x32",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        },
        {
            "binary_name":  "libc6-i386",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        },
        {
            "binary_name":  "libc6-lse",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        },
        {
            "binary_name":  "libc6-pic",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        },
        {
            "binary_name":  "libc6-prof",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        },
        {
            "binary_name":  "libc6-s390",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        },
        {
            "binary_name":  "libc6-x32",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        },
        {
            "binary_name":  "locales",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        },
        {
            "binary_name":  "locales-all",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        },
        {
            "binary_name":  "nscd",
            "binary_version":  "2.31-0ubuntu9.18+esm1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-86805.json"