SB20260812410 - Improper Check or Handling of Exceptional Conditions in Linux kernel ptp driver

Description

This security bulletin contains information about 1 vulnerability.

1) Improper Check or Handling of Exceptional Conditions (CVE-ID: CVE-2026-68134)

CWE-ID: CWE-703 - Improper Check or Handling of Exceptional Conditions

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.

The vulnerability exists due to improper state validation in the ptp_s390 driver when initializing and unregistering PTP clocks on systems where facility 28 or PTFF QPT support is unavailable. A local user can trigger initialization of the vulnerable component to cause a denial of service.

The issue is specific to s390 PTP clock handling.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/545a7fdbc110c82933d448db2695abff07536f08
• https://git.kernel.org/stable/c/b3efb4744abf493c9782eae713b861a80d9bbeca
• https://git.kernel.org/stable/c/e78f1ac37afcb16cb6fef8a2c92591eab6558956