SB20261029144 - NULL pointer dereference in Linux kernel trace

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-99160)

CWE-ID: CWE-476 - NULL Pointer Dereference

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 cause a denial of service by triggering a kernel NULL pointer dereference.

The vulnerability exists due to a null pointer dereference in the Linux kernel ring-buffer rbm_start() function when reading buffer metadata for a CPU that has never come online. A local user can read the corresponding per_cpu/cpuN/buffer_meta file to trigger access to an unallocated CPU buffer and potentially crash the kernel.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/3f23cae09a4677a3f7c163a68388512cb231ff22
• https://git.kernel.org/stable/c/8512d0312cc0ea83ca4511b164c29a138bbb0c21
• https://git.kernel.org/stable/c/ae670c1a24fb5ffb167f26358cf47a5f0abbd670