USN-8611-1

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Source
https://ubuntu.com/security/notices/USN-8611-1
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8611-1.json
JSON Data
https://api.osv.dev/v1/vulns/USN-8611-1
Upstream
Related
Published
2026-07-27T12:24:25Z
Modified
2026-07-27T21:14:45.559246235Z
Summary
glibc vulnerabilities
Details

It was discovered that the GNU C Library iconv function incorrectly handled certain IBM character sets. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-4046)

It was discovered that the GNU C Library DNS functions incorrectly handled certain DNS server responses when using gethostbyaddr or gethostbyaddr_r. An attacker in a privileged network position could possibly use this issue to cause an application to violate DNS specification or obtain incorrect hostname information. This issue only affected Ubuntu 24.04 LTS. (CVE-2026-4437, CVE-2026-4438)

It was discovered that the GNU C Library deprecated debugging functions incorrectly enforced caller-supplied buffer lengths. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-5435)

It was discovered that the GNU C Library scanf family of functions contained a heap buffer overflow when processing certain format specifiers. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-5450)

It was discovered that the GNU C Library ungetwc function incorrectly handled certain character encodings. An attacker could possibly use this issue to obtain sensitive information or cause a denial of service. (CVE-2026-5928)

It was discovered that the GNU C Library deprecated debugging functions incorrectly validated DNS response record data. An attacker could possibly use this issue to cause a denial of service or obtain sensitive information. (CVE-2026-6238)

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
0Unknown introduced version / All previous versions are affected
Fixed
2.35-0ubuntu3.14

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "glibc-source"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc-bin"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc-dev-bin"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc-devtools"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6-amd64"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6-dev-amd64"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6-dev-i386"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6-dev-s390"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6-dev-x32"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6-i386"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6-prof"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6-s390"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "libc6-x32"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "locales"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "locales-all"
        },
        {
            "binary_version": "2.35-0ubuntu3.14",
            "binary_name": "nscd"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-4046",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        },
        {
            "id": "CVE-2026-5435",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L",
                    "type": "CVSS_V3"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-5450",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-5928",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-6238",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:22.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8611-1.json"

Ubuntu:24.04:LTS / glibc

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.39-0ubuntu8.8

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "glibc-source"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc-bin"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc-dev-bin"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc-devtools"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc6"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc6-amd64"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc6-dev-amd64"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc6-dev-i386"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc6-dev-s390"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc6-dev-x32"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc6-i386"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc6-s390"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "libc6-x32"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "locales"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "locales-all"
        },
        {
            "binary_version": "2.39-0ubuntu8.8",
            "binary_name": "nscd"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-4046",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-4437",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-4438",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:N",
                    "type": "CVSS_V3"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-5435",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        },
        {
            "id": "CVE-2026-5450",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        },
        {
            "id": "CVE-2026-5928",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        },
        {
            "id": "CVE-2026-6238",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:24.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8611-1.json"

Ubuntu:26.04:LTS / glibc

Package

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

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.43-2ubuntu2.3

Affected versions

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "glibc-source"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc-bin"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc-dev-bin"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc-devtools"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc-gconv-modules-extra"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc6"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc6-amd64"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc6-dev-amd64"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc6-dev-i386"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc6-dev-x32"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc6-i386"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "libc6-x32"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "locales"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "locales-all"
        },
        {
            "binary_version": "2.43-2ubuntu2.3",
            "binary_name": "nscd"
        }
    ]
}

Database specific

cves_map 
{
    "cves": [
        {
            "id": "CVE-2026-4046",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        },
        {
            "id": "CVE-2026-5435",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:L/A:L"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        },
        {
            "id": "CVE-2026-5450",
            "severity": [
                {
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
                    "type": "CVSS_V3"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        },
        {
            "id": "CVE-2026-5928",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H"
                },
                {
                    "score": "medium",
                    "type": "Ubuntu"
                }
            ]
        },
        {
            "id": "CVE-2026-6238",
            "severity": [
                {
                    "type": "CVSS_V3",
                    "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L"
                },
                {
                    "type": "Ubuntu",
                    "score": "medium"
                }
            ]
        }
    ],
    "ecosystem": "Ubuntu:26.04:LTS"
}
source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/usn/USN-8611-1.json"