SB20261022399 - Memory leak in Linux kernel bpf

Description

This security bulletin contains information about 1 vulnerability.

1) Memory leak (CVE-ID: CVE-2026-98789)

CWE-ID: CWE-401 - Missing release of memory after effective lifetime

CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to exhaust kernel memory and potentially cause a denial of service.

The vulnerability exists due to a memory leak in the BPF memory allocator when objects are queued for freeing during an ongoing RCU tasks trace grace period. A local user can trigger BPF memory allocation and freeing operations under these conditions to leave an unbounded number of objects unreclaimed, potentially exhausting kernel memory and causing a denial of service.

Objects can remain stranded indefinitely if no further bulk allocation or freeing occurs for the same BPF memory cache.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/33d0a5d2fee06a51f2f056dd901296515912e954
• https://git.kernel.org/stable/c/fbd97dd1d3ce32d32fb7be86acc3fdb7c04fa043