UBUNTU-CVE-2026-0861

See a problem?
Please try reporting it to the source first.
Source
https://ubuntu.com/security/CVE-2026-0861
Import Source
https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-0861.json
JSON Data
https://api.test.osv.dev/v1/vulns/UBUNTU-CVE-2026-0861
Upstream
Downstream
Related
Published
2026-01-14T21:15:00Z
Modified
2026-02-04T08:43:47.711092Z
Severity
  • 8.4 (High) CVSS_V3 - CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H CVSS Calculator
  • Ubuntu - medium
Summary
[none]
Details

Passing too large an alignment to the memalign suite of functions (memalign, posixmemalign, alignedalloc) in the GNU C Library version 2.30 to 2.42 may result in an integer overflow, which could consequently result in a heap corruption. Note that the attacker must have control over both, the size as well as the alignment arguments of the memalign function to be able to exploit this. The size parameter must be close enough to PTRDIFFMAX so as to overflow sizet along with the large alignment argument. This limits the malicious inputs for the alignment for memalign to the range [1<<62+ 1, 1<<63] and exactly 1<<63 for posixmemalign and alignedalloc. Typically the alignment argument passed to such functions is a known constrained quantity (e.g. page size, block size, struct sizes) and is not attacker controlled, because of which this may not be easily exploitable in practice. An application bug could potentially result in the input alignment being too large, e.g. due to a different buffer overflow or integer overflow in the application or its dependent libraries, but that is again an uncommon usage pattern given typical sources of alignments.

References

Affected packages

Ubuntu:Pro:20.04:LTS / glibc

Package

Name
glibc
Purl
pkg:deb/ubuntu/glibc@2.31-0ubuntu9.18+esm1?arch=source&distro=esm-infra/focal

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.31-0ubuntu9.18+esm1

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

Ecosystem specific 

{
    "availability": "Available with Ubuntu Pro (Infra-only): https://ubuntu.com/pro",
    "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",
            "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-2026-0861.json"

Ubuntu:22.04:LTS / glibc

Package

Name
glibc
Purl
pkg:deb/ubuntu/glibc@2.35-0ubuntu3.13?arch=source&distro=jammy

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.35-0ubuntu3.13

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "glibc-source",
            "binary_version": "2.35-0ubuntu3.13"
        },
        {
            "binary_name": "libc-bin",
            "binary_version": "2.35-0ubuntu3.13"
        },
        {
            "binary_name": "libc-dev-bin",
            "binary_version": "2.35-0ubuntu3.13"
        },
        {
            "binary_name": "libc-devtools",
            "binary_version": "2.35-0ubuntu3.13"
        },
        {
            "binary_name": "libc6",
            "binary_version": "2.35-0ubuntu3.13"
        },
        {
            "binary_name": "libc6-amd64",
            "binary_version": "2.35-0ubuntu3.13"
        },
        {
            "binary_name": "libc6-dev",
            "binary_version": "2.35-0ubuntu3.13"
        },
        {
            "binary_name": "libc6-dev-amd64",
            "binary_version": "2.35-0ubuntu3.13"
        },
        {
            "binary_name": "libc6-dev-i386",
            "binary_version": "2.35-0ubuntu3.13"
        },
        {
            "binary_name": "libc6-dev-s390",
            "binary_version": "2.35-0ubuntu3.13"
        },
        {
            "binary_name": "libc6-dev-x32",
            "binary_version": "2.35-0ubuntu3.13"
        },
        {
            "binary_name": "libc6-i386",
            "binary_version": "2.35-0ubuntu3.13"
        },
        {
            "binary_name": "libc6-prof",
            "binary_version": "2.35-0ubuntu3.13"
        },
        {
            "binary_name": "libc6-s390",
            "binary_version": "2.35-0ubuntu3.13"
        },
        {
            "binary_name": "libc6-x32",
            "binary_version": "2.35-0ubuntu3.13"
        },
        {
            "binary_name": "locales",
            "binary_version": "2.35-0ubuntu3.13"
        },
        {
            "binary_name": "locales-all",
            "binary_version": "2.35-0ubuntu3.13"
        },
        {
            "binary_name": "nscd",
            "binary_version": "2.35-0ubuntu3.13"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-0861.json"

Ubuntu:24.04:LTS / glibc

Package

Name
glibc
Purl
pkg:deb/ubuntu/glibc@2.39-0ubuntu8.7?arch=source&distro=noble

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.39-0ubuntu8.7

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

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "glibc-source",
            "binary_version": "2.39-0ubuntu8.7"
        },
        {
            "binary_name": "libc-bin",
            "binary_version": "2.39-0ubuntu8.7"
        },
        {
            "binary_name": "libc-dev-bin",
            "binary_version": "2.39-0ubuntu8.7"
        },
        {
            "binary_name": "libc-devtools",
            "binary_version": "2.39-0ubuntu8.7"
        },
        {
            "binary_name": "libc6",
            "binary_version": "2.39-0ubuntu8.7"
        },
        {
            "binary_name": "libc6-amd64",
            "binary_version": "2.39-0ubuntu8.7"
        },
        {
            "binary_name": "libc6-dev",
            "binary_version": "2.39-0ubuntu8.7"
        },
        {
            "binary_name": "libc6-dev-amd64",
            "binary_version": "2.39-0ubuntu8.7"
        },
        {
            "binary_name": "libc6-dev-i386",
            "binary_version": "2.39-0ubuntu8.7"
        },
        {
            "binary_name": "libc6-dev-s390",
            "binary_version": "2.39-0ubuntu8.7"
        },
        {
            "binary_name": "libc6-dev-x32",
            "binary_version": "2.39-0ubuntu8.7"
        },
        {
            "binary_name": "libc6-i386",
            "binary_version": "2.39-0ubuntu8.7"
        },
        {
            "binary_name": "libc6-s390",
            "binary_version": "2.39-0ubuntu8.7"
        },
        {
            "binary_name": "libc6-x32",
            "binary_version": "2.39-0ubuntu8.7"
        },
        {
            "binary_name": "locales",
            "binary_version": "2.39-0ubuntu8.7"
        },
        {
            "binary_name": "locales-all",
            "binary_version": "2.39-0ubuntu8.7"
        },
        {
            "binary_name": "nscd",
            "binary_version": "2.39-0ubuntu8.7"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-0861.json"

Ubuntu:25.10 / glibc

Package

Name
glibc
Purl
pkg:deb/ubuntu/glibc@2.42-0ubuntu3.1?arch=source&distro=questing

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
2.42-0ubuntu3.1

Affected versions

2.*
2.41-6ubuntu1
2.41-6ubuntu2
2.41-9ubuntu1
2.42-0ubuntu1
2.42-0ubuntu3

Ecosystem specific 

{
    "availability": "No subscription required",
    "binaries": [
        {
            "binary_name": "glibc-source",
            "binary_version": "2.42-0ubuntu3.1"
        },
        {
            "binary_name": "libc-bin",
            "binary_version": "2.42-0ubuntu3.1"
        },
        {
            "binary_name": "libc-dev-bin",
            "binary_version": "2.42-0ubuntu3.1"
        },
        {
            "binary_name": "libc-devtools",
            "binary_version": "2.42-0ubuntu3.1"
        },
        {
            "binary_name": "libc6",
            "binary_version": "2.42-0ubuntu3.1"
        },
        {
            "binary_name": "libc6-amd64",
            "binary_version": "2.42-0ubuntu3.1"
        },
        {
            "binary_name": "libc6-dev",
            "binary_version": "2.42-0ubuntu3.1"
        },
        {
            "binary_name": "libc6-dev-amd64",
            "binary_version": "2.42-0ubuntu3.1"
        },
        {
            "binary_name": "libc6-dev-i386",
            "binary_version": "2.42-0ubuntu3.1"
        },
        {
            "binary_name": "libc6-dev-x32",
            "binary_version": "2.42-0ubuntu3.1"
        },
        {
            "binary_name": "libc6-i386",
            "binary_version": "2.42-0ubuntu3.1"
        },
        {
            "binary_name": "libc6-x32",
            "binary_version": "2.42-0ubuntu3.1"
        },
        {
            "binary_name": "locales",
            "binary_version": "2.42-0ubuntu3.1"
        },
        {
            "binary_name": "locales-all",
            "binary_version": "2.42-0ubuntu3.1"
        },
        {
            "binary_name": "nscd",
            "binary_version": "2.42-0ubuntu3.1"
        }
    ]
}

Database specific

source 
"https://github.com/canonical/ubuntu-security-notices/blob/main/osv/cve/2026/UBUNTU-CVE-2026-0861.json"