SB20261022429 - Use-after-free in Linux kernel bpf

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-98813)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 6.7 [CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local privileged user to cause a denial of service through a kernel use-after-free.

The vulnerability exists due to use-after-free in the BPF memory allocator destructor context for non-preallocated hash maps and resizable hash maps when deferred teardown accesses map BTF data after it has been freed. A local privileged user can trigger teardown of a BPF map with pending RCU callbacks and release the associated BTF-owning program to cause deferred destructor processing to dereference freed memory, potentially crashing the kernel.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/ab39974240a0cff765f3bb9cce81d8001ffdb144
• https://git.kernel.org/stable/c/b506f5699e145196ee29d76cf1ca1cbb2202c055