SB2026052829 - Always-Incorrect Control Flow Implementation in Linux kernel ceph

Description

This security bulletin contains information about 1 vulnerability.

1) Always-Incorrect Control Flow Implementation (CVE-ID: CVE-2026-46052)

CWE-ID: CWE-670 - Always-Incorrect Control Flow Implementation

CVSSv4: 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/E:U/U:Clear

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

The vulnerability exists due to improper handling of negative dentries in fs/ceph/dir.c when processing Ceph lookup or atomic_open operations with reused cached negative dentries. A local user can trigger lookup paths that call d_add() on an already-hashed negative dentry to cause a denial of service.

The issue can corrupt the dcache hash bucket, potentially creating a self-loop that causes __d_lookup() to spin forever and trigger RCU stall reports.

Remediation

Install update from vendor's website.

References

• https://git.kernel.org/stable/c/2010cb06b9df7d3c816c78358c566bdacbdf38ff
• https://git.kernel.org/stable/c/4179cc390dacebc87079419ec92f86f3dc46294d
• https://git.kernel.org/stable/c/803447f93d75ab6e40c85e6d12b5630d281d70d6
• https://git.kernel.org/stable/c/83ce43a21bb7df8dd52228afdd918d2d058eefde
• https://git.kernel.org/stable/c/b91e535f208c48a5e7464f1aa38338a30e7912df