SB20260424184 - Allocation of Resources Without Limits or Throttling in Linux kernel ipv4

Description

This security bulletin contains information about 1 vulnerability.

1) Allocation of Resources Without Limits or Throttling (CVE-ID: CVE-2026-31531)

CWE-ID: CWE-770 - Allocation of Resources Without Limits or Throttling

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper memory allocation in rtm_get_nexthop() when handling RTM_GETNEXTHOP requests for large nexthop groups. A local user can send a specially crafted netlink request to cause a denial of service.

This issue can be triggered when querying large Equal-Cost Multi-Path nexthop groups such as groups containing hundreds of nexthops.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/14cf0cd35361f4e94824bf8a42f72713d7702a73
• https://git.kernel.org/stable/c/40bd39e383a0478fd5c221f393df05fd9d70cfbc
• https://git.kernel.org/stable/c/615517f3f8d53b0cf41507c7599971e17adfdfa5
• https://git.kernel.org/stable/c/635038fe19db391117e66b46bdc2b6e447ac801d