What’s Vulnerable › Vulnerabilities

CVE-2023-52760: gfs2: Fix slab-use-after-free in gfs2_qd_dealloc

• Severity: high (CVSS 7.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.3% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-05-21 · updated 2026-08-04
• Weakness: CWE-416

Description

In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix slab-use-after-free in gfs2_qd_dealloc In gfs2_put_super(), whether withdrawn or not, the quota should be cleaned up by gfs2_quota_cleanup(). Otherwise, struct gfs2_sbd will be freed before gfs2_qd_dealloc (rcu callback) has run for all gfs2_quota_data objects, resulting in use-after-free. Also, gfs2_destroy_threads() and gfs2_quota_cleanup() is already called by gfs2_make_fs_ro(), so in gfs2_put_super(), after calling gfs2_make_fs_ro(), there is no need to call them again.

Affected products

• Linux kernel: before 6.1.97; from 6.2 before 6.6.3 — fixed in 6.1.97, 6.6.3

How to fix

Upgrade to a fixed version: Linux kernel 6.1.97, 6.6.3. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/08a28272faa750d4357ea2cb48d2baefd778ea81
• https://git.kernel.org/stable/c/bdcb8aa434c6d36b5c215d02a9ef07551be25a37
• https://git.kernel.org/stable/c/08a28272faa750d4357ea2cb48d2baefd778ea81
• https://git.kernel.org/stable/c/7ad4e0a4f61c57c3ca291ee010a9d677d0199fba
• https://git.kernel.org/stable/c/bdcb8aa434c6d36b5c215d02a9ef07551be25a37
• https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html

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