DEBIAN-CVE-2026-86805

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Source
https://security-tracker.debian.org/tracker/CVE-2026-86805
Import Source
https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-86805.json
JSON Data
https://api.osv.dev/v1/vulns/DEBIAN-CVE-2026-86805
Upstream
Published
2026-09-22T16:18:06Z
Modified
2026-09-23T06:47:32Z
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
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

Debian:12 / glibc

Package

Name
glibc
Purl
pkg:deb/debian/glibc?arch=source&distro=bookworm

Affected ranges

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

Affected versions

2.*
2.36-9
2.36-9+deb12u1
2.36-9+deb12u2
2.36-9+deb12u3
2.36-9+deb12u4
2.36-9+deb12u5
2.36-9+deb12u6
2.36-9+deb12u7
2.36-9+deb12u8
2.36-9+deb12u9
2.36-9+deb12u10
2.36-9+deb12u11
2.36-9+deb12u12
2.36-9+deb12u13
2.36-9+deb12u14
2.36-9+loong64
2.36-10~0
2.37-1
2.37-2
2.37-3
2.37-4
2.37-5
2.37-6
2.37-7
2.37-8
2.37-9
2.37-10
2.37-11
2.37-12
2.37-13
2.37-14
2.37-15~deb13u1
2.37-15
2.37-15.1
2.37-15.1+sh4
2.37-16
2.37-17
2.37-18
2.37-19
2.38-1
2.38-2
2.38-3
2.38-4
2.38-5
2.38-6
2.38-7~0+hurd.1
2.38-7
2.38-8
2.38-9
2.38-10
2.38-11
2.38-12
2.38-12.1
2.38-13
2.38-14
2.38-15~0
2.38-15~1
2.39-1
2.39-2
2.39-3
2.39-3.1
2.39-4
2.39-5
2.39-6
2.39-6+hurd.1
2.39-6+sh4
2.39-7~0
2.39-7
2.39-7+sh4
2.39-8~0
2.40-1
2.40-2
2.40-2+sh4
2.40-3
2.40-3+sh4
2.40-4
2.40-5~hurd.1
2.40-5
2.40-6~1
2.40-6
2.40-7
2.41-1
2.41-2
2.41-3
2.41-4~0
2.41-4
2.41-5~0
2.41-5
2.41-6
2.41-7
2.41-8~0
2.41-8~1
2.41-8
2.41-9~0
2.41-9~1
2.41-9
2.41-10
2.41-11
2.41-12
2.41-13~hurd.0
2.41-13~hurd.1
2.42-1
2.42-2
2.42-3
2.42-4
2.42-5
2.42-6
2.42-7
2.42-8~hurd.1
2.42-8~hurd.2
2.42-8
2.42-9
2.42-10
2.42-11
2.42-12~hurd.1
2.42-12
2.42-13
2.42-14~hurd.1
2.42-14
2.42-15~hurd.1
2.42-15
2.42-16
2.42-17
2.43-1
2.43-2
2.43-3
2.43-3+m68k
2.43-4
2.43-4+m68k
2.43-5
2.43-6
2.44-1
2.44-2

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-86805.json"

Debian:13 / glibc

Package

Name
glibc
Purl
pkg:deb/debian/glibc?arch=source&distro=trixie

Affected ranges

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

Affected versions

2.*
2.41-12
2.41-12+deb13u1
2.41-12+deb13u2
2.41-12+deb13u3
2.41-12+deb13u4
2.41-13~hurd.0
2.41-13~hurd.1
2.42-1
2.42-2
2.42-3
2.42-4
2.42-5
2.42-6
2.42-7
2.42-8~hurd.1
2.42-8~hurd.2
2.42-8
2.42-9
2.42-10
2.42-11
2.42-12~hurd.1
2.42-12
2.42-13
2.42-14~hurd.1
2.42-14
2.42-15~hurd.1
2.42-15
2.42-16
2.42-17
2.43-1
2.43-2
2.43-3
2.43-3+m68k
2.43-4
2.43-4+m68k
2.43-5
2.43-6
2.44-1
2.44-2

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-86805.json"

Debian:14 / glibc

Package

Name
glibc
Purl
pkg:deb/debian/glibc?arch=source&distro=forky

Affected ranges

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

Affected versions

2.*
2.41-12
2.41-13~hurd.0
2.41-13~hurd.1
2.42-1
2.42-2
2.42-3
2.42-4
2.42-5
2.42-6
2.42-7
2.42-8~hurd.1
2.42-8~hurd.2
2.42-8
2.42-9
2.42-10
2.42-11
2.42-12~hurd.1
2.42-12
2.42-13
2.42-14~hurd.1
2.42-14
2.42-15~hurd.1
2.42-15
2.42-16
2.42-17
2.43-1
2.43-2
2.43-3
2.43-3+m68k
2.43-4
2.43-4+m68k
2.43-5
2.43-6
2.44-1
2.44-2

Ecosystem specific 

{
    "urgency":  "not yet assigned"
}

Database specific

source 
"https://storage.googleapis.com/debian-osv/debian-cve-osv/DEBIAN-CVE-2026-86805.json"