SB2026052796 - Missing Release of Resource after Effective Lifetime in Linux kernel afs

Description

This security bulletin contains information about 1 vulnerability.

1) Missing Release of Resource after Effective Lifetime (CVE-ID: CVE-2026-46100)

CWE-ID: CWE-772 - Missing Release of Resource after Effective Lifetime

CVSSv4: CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:L/SC:N/SI:N/SA:N/E:U/U:Clear

The vulnerability allows a local user to cause a denial of service.

The vulnerability exists due to improper reference count management in the afs mmap handling code when preparing memory mappings. A local user can trigger memory mapping operations to cause a denial of service.

The issue can occur if a merge or allocation failure happens after the preparation step, leading to a leaked reference count increment.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/48c7a0eaeea41da17d1d84d2d7a4c40be122b246
• https://git.kernel.org/stable/c/f51f85c044809fbd39ac8ae07ac99bc43ce32bd5
• https://git.kernel.org/stable/c/fbfc6578eaca12daa0c09df1e9ba7f2c657b49da