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Ubuntu 22.04 LTS / 26.04 LTS / Pro Realtime 22.04 LTS : GNU C Library vulnerabilities (USN-8737-1)

critical Nessus Plugin ID 344610

Synopsis

The remote Ubuntu host is missing one or more security updates.

Description

The remote Ubuntu 22.04 LTS / 26.04 LTS / Pro Realtime 22.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8737-1 advisory.

 It was discovered that GNU C Library had a buffer overflow in the strfmon function when handling right- justification padding. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. This issue only affected Ubuntu 26.04 LTS. (CVE-2026-19499)

 It was discovered that GNU C Library had an out-of-bounds stack array access in the tdelete function. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code.
 (CVE-2026-19542)

 It was discovered that GNU C Library incorrectly handled memory when calling wordexp with the WRDE_APPEND flag. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-6368)

 It was discovered that GNU C Library had a stack overflow in the wordexp function when expanding paths beginning with a tilde followed by a long username. An attacker could possibly use this issue to cause a denial of service or execute arbitrary code. (CVE-2026-6791)

 It was discovered that GNU C Library had a hang in the SHIFT_JISX0213 character set converter. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-77117)

 It was discovered that GNU C Library had a hang in the EUC_JISX0213 character set converter. An attacker could possibly use this issue to cause a denial of service. (CVE-2026-80489)

Tenable has extracted the preceding description block directly from the Ubuntu security advisory.

Note that Nessus has not tested for these issues but has instead relied only on the application's self-reported version number.

Solution

Update the affected packages.

See Also

https://ubuntu.com/security/notices/USN-8737-1

Plugin Details

Severity: Critical

ID: 344610

File Name: ubuntu_USN-8737-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 9/10/2026

Updated: 9/10/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.9

Percentile: 58.15

CVSS v2

Risk Factor: Medium

Base Score: 5.4

Temporal Score: 4

Vector: CVSS2#AV:N/AC:H/Au:N/C:N/I:N/A:C

CVSS Score Source: CVE-2026-6791

CVSS v3

Risk Factor: Medium

Base Score: 5.9

Temporal Score: 5.2

Vector: CVSS:3.0/AV:N/AC:H/PR:N/UI:N/S:U/C:N/I:N/A:H

Temporal Vector: CVSS:3.0/E:U/RL:O/RC:C

CVSS v4

Risk Factor: Critical

Base Score: 9

Threat Score: 6.6

Threat Vector: CVSS:4.0/E:U

Vector: CVSS:4.0/AV:N/AC:H/AT:N/PR:N/UI:N/VC:L/VI:L/VA:H/SC:N/SI:L/SA:H

Vulnerability Information

CPE: cpe:/o:canonical:ubuntu_linux:22.04:-:lts, cpe:/o:canonical:ubuntu_linux:26.04:-:lts, cpe:/o:canonical:ubuntu_linux:pro:-:lts, p-cpe:/a:canonical:ubuntu_linux:glibc-source, p-cpe:/a:canonical:ubuntu_linux:libc-bin, p-cpe:/a:canonical:ubuntu_linux:libc-dev-bin, p-cpe:/a:canonical:ubuntu_linux:libc-devtools, p-cpe:/a:canonical:ubuntu_linux:libc-gconv-modules-extra, p-cpe:/a:canonical:ubuntu_linux:libc6-amd64, p-cpe:/a:canonical:ubuntu_linux:libc6-dev-amd64, p-cpe:/a:canonical:ubuntu_linux:libc6-dev-i386, p-cpe:/a:canonical:ubuntu_linux:libc6-dev-s390, p-cpe:/a:canonical:ubuntu_linux:libc6-dev-x32, p-cpe:/a:canonical:ubuntu_linux:libc6-i386, p-cpe:/a:canonical:ubuntu_linux:libc6-prof, p-cpe:/a:canonical:ubuntu_linux:libc6-s390, p-cpe:/a:canonical:ubuntu_linux:libc6-x32, p-cpe:/a:canonical:ubuntu_linux:libc6, p-cpe:/a:canonical:ubuntu_linux:locales-all, p-cpe:/a:canonical:ubuntu_linux:locales, p-cpe:/a:canonical:ubuntu_linux:nscd

Required KB Items: Host/cpu, Host/Debian/dpkg-l, Host/Ubuntu, Host/Ubuntu/release

Exploit Ease: No known exploits are available

Patch Publication Date: 9/8/2026

Vulnerability Publication Date: 8/10/2026

Reference Information

CVE: CVE-2026-19499, CVE-2026-19542, CVE-2026-6368, CVE-2026-6791, CVE-2026-77117, CVE-2026-80489

IAVA: 2026-A-0897

USN: 8737-1