SB2026091669 - Improper control of a resource through its lifetime in Linux kernel ceph

Description

This security bulletin contains information about 1 vulnerability.

1) Improper control of a resource through its lifetime (CVE-ID: CVE-2026-90042)

CWE-ID: CWE-664 - Improper control of a resource through its lifetime

CVSSv4: 9.3 [CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]

The vulnerability allows a remote attacker to cause a denial of service.

The vulnerability exists due to improper handling of non-linear memory buffers in ceph_fname_to_usr() when processing MDS messages held in vmalloc()-allocated buffers. A remote attacker can cause a message containing encrypted filenames to be processed to cause a denial of service.

The issue can result in kernel oopses, especially on non-x86 platforms.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/110747ff535e3d98ac17d68dbd056bb6ef000e23
• https://git.kernel.org/stable/c/3b467c68803d7c7e82678289e598afd44faa6101
• https://git.kernel.org/stable/c/e939fc6a7bd969a58a150b7f188c1047138403e3