SB20261022412 - Use-after-free in Linux kernel bpf

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-98799)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 5.6 [CVSS:4.0/AV:L/AC:L/AT:P/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 by triggering a kernel fault.

The vulnerability exists due to use-after-free in the Linux kernel BPF trampoline subsystem when a detached program is freed while an active trampoline image still references it. A local privileged user can trigger program detachment while a task sleeps in an earlier sleepable BPF program, causing the task to access the freed program when execution resumes and cause a denial of service.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/17637e1a581a22466ac3620a91e099683ff9cc6f
• https://git.kernel.org/stable/c/967566ad325b42150483e81acb09ea9d800c00b8