SB20260928145 - Improper input validation in Linux kernel trace

Description

This security bulletin contains information about 1 vulnerability.

1) Improper input validation (CVE-ID: CVE-2026-98057)

CWE-ID: CWE-20 - Improper input validation

CVSSv4: 0 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:N/SC:N/SI:N/SA:N]

The vulnerability allows a local user to cause persistent ring buffer validation to accept an inconsistent sub-buffer count.

The vulnerability exists due to improper input validation in the persistent ring buffer validation code when validating saved persistent ring buffer metadata. A local user can trigger validation of saved metadata with an nr_subbufs value that does not match nr_pages + 1 to cause persistent ring buffer validation to accept an inconsistent sub-buffer count.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/69d502457e3f76142f7fcf6e2625e80e0ce8a60f
• https://git.kernel.org/stable/c/6c001a62c34f13fe1c6a24304c289b387d9e697d
• https://git.kernel.org/stable/c/f0467190e6a9fc61e343c8064ef16aad513788c3