CVE-2024-56564: ceph: pass cred pointer to ceph_mds_auth_match()

Severity: medium (CVSS 5.5 v3.1)
Exploited in the wild: not listed in CISA KEV
EPSS: 0.2% probability of exploitation in the next 30 days
Public exploit or detection template: none known
Published: 2024-12-27 · updated 2026-06-17

Description

In the Linux kernel, the following vulnerability has been resolved: ceph: pass cred pointer to ceph_mds_auth_match() This eliminates a redundant get_current_cred() call, because ceph_mds_check_access() has already obtained this pointer. As a side effect, this also fixes a reference leak in ceph_mds_auth_match(): by omitting the get_current_cred() call, no additional cred reference is taken.

Affected products

Linux kernel: from 6.10 before 6.12.4 — fixed in 6.12.4

How to fix

Upgrade to a fixed version: Linux kernel 6.12.4. Check the vendor advisory for mitigations.

References

https://git.kernel.org/stable/c/23426309a4064b25a961e1c72961d8bfc7c8c990
https://git.kernel.org/stable/c/ffa6ba7bdb7f07f49c9e9150b0176df066520f62

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