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Ubuntu 22.04 LTS / 24.04 LTS : FRR vulnerabilities (USN-8376-1)

medium Nessus Plugin ID 318637

Synopsis

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

Description

The remote Ubuntu 22.04 LTS / 24.04 LTS host has packages installed that are affected by multiple vulnerabilities as referenced in the USN-8376-1 advisory.

 It was discovered that FRR incorrectly handled certain OSPF Traffic Engineering and Segment Routing TLVs.
 An attacker could possibly use this issue to cause FRR to crash, resulting in a denial of service.
 (CVE-2026-28532)

 It was discovered that FRR incorrectly handled certain BGP FlowSpec components. An attacker could possibly use this issue to cause FRR to crash, resulting in a denial of service. (CVE-2026-37457)

 It was discovered that FRR did not properly validate certain MP_REACH_NLRI messages. An authenticated user could possibly use this issue to cause FRR to crash, resulting in a denial of service. (CVE-2026-37458)

 It was discovered that FRR incorrectly handled processing certain BGP UPDATE messages. An attacker could possibly use this issue to cause FRR to crash, resulting in a denial of service. This issue only affected Ubuntu 25.04 and Ubuntu 25.10. (CVE-2026-37459)

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-8376-1

Plugin Details

Severity: Medium

ID: 318637

File Name: ubuntu_USN-8376-1.nasl

Version: 1.1

Type: Local

Agent: unix

Published: 6/4/2026

Updated: 6/4/2026

Supported Sensors: Nessus Agent, Continuous Assessment, Nessus

Risk Information

VPR

Risk Factor: Medium

Score: 4.4

CVSS v2

Risk Factor: Medium

Base Score: 6.1

Temporal Score: 4.5

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

CVSS Score Source: CVE-2026-28532

CVSS v3

Risk Factor: High

Base Score: 7.5

Temporal Score: 6.5

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

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

CVSS Score Source: CVE-2026-37459

CVSS v4

Risk Factor: Medium

Base Score: 6

Threat Score: 2.3

Threat Vector: CVSS:4.0/E:U

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

Vulnerability Information

CPE: p-cpe:/a:canonical:ubuntu_linux:frr-snmp, cpe:/o:canonical:ubuntu_linux:24.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:frr-rpki-rtrlib, cpe:/o:canonical:ubuntu_linux:22.04:-:lts, p-cpe:/a:canonical:ubuntu_linux:frr-pythontools, p-cpe:/a:canonical:ubuntu_linux:frr

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

Exploit Ease: No known exploits are available

Patch Publication Date: 6/3/2026

Vulnerability Publication Date: 4/30/2026

Reference Information

CVE: CVE-2026-28532, CVE-2026-37457, CVE-2026-37458, CVE-2026-37459

USN: 8376-1