SB20261022401 - NULL pointer dereference in Linux kernel core en driver

Description

This security bulletin contains information about 1 vulnerability.

1) NULL pointer dereference (CVE-ID: CVE-2026-98791)

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 mlx5e_xsk_fill_timestamp() when completing outstanding transmit descriptors without a completion queue entry during AF_XDP TX queue teardown. A local user can trigger teardown with an outstanding descriptor that requested a transmit timestamp to cause a denial of service.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/63df0ef4c6e3105589e6bb2e758ce611b0ada86c
• https://git.kernel.org/stable/c/7b97273cbebe9dd4fddc457f0c4f2a124d0e3996
• https://git.kernel.org/stable/c/f81d40e2eb69552334f510114f3e6edd0d43178b
• https://git.kernel.org/stable/c/fce70b6bf9f3261e887419a4e7caa25b80fa9d55