SB20261023112 - Use-after-free in Linux kernel verity

Description

This security bulletin contains information about 1 vulnerability.

1) Use-after-free (CVE-ID: CVE-2026-99051)

CWE-ID: CWE-416 - Use After Free

CVSSv4: 5.7 [CVSS:4.0/AV:L/AC:L/AT:P/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a local user to potentially cause a denial of service through a kernel crash.

The vulnerability exists due to a use-after-free in the Linux kernel fs-verity subsystem when concurrent metadata lookups and removal involve different inodes in the same hash chain. A local user can potentially trigger these concurrent operations to cause a lookup to access the rhash_head or inode fields of a freed fsverity_info structure, which may crash the kernel.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/e58c3805ed325fe2d4ae2dd467c0486cc860b733
• https://git.kernel.org/stable/c/fa84f091a8e7fc46fd29834496fab9739dd4c8dc