Allocation of Resources Without Limits or Throttling in Linux kernel - CVE-2026-31531
Published: April 24, 2026
Vulnerability identifier: #VU127615
CSH Severity: Low
CVSS v4.0: 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
CVE-ID: CVE-2026-31531
CWE-ID: CWE-770
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
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.
How to mitigate CVE-2026-31531
Install security update from vendor's repository.