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CVE-2026-53049: gfs2: add some missing log locking

• Severity: critical (CVSS 9.8 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-24 · updated 2026-10-19
• Weakness: CWE-667

Description

In the Linux kernel, the following vulnerability has been resolved: gfs2: add some missing log locking Function gfs2_logd() calls the log flushing functions gfs2_ail1_start(), gfs2_ail1_wait(), and gfs2_ail1_empty() without holding sdp->sd_log_flush_lock, but these functions require exclusion against concurrent transactions. To fix that, add a non-locking __gfs2_log_flush() function. Then, in gfs2_logd(), take sdp->sd_log_flush_lock before calling the above mentioned log flushing functions and __gfs2_log_flush().

Affected products

• Linux kernel: from 5.7 before 5.15.209; from 5.16 before 6.1.175; from 6.2 before 6.6.141; from 6.7 before 6.12.91; from 6.13 before 6.18.33; from 6.19 before 7.0.10 — fixed in 5.15.209, 6.1.175, 6.12.91, 6.18.33, 6.6.141, 7.0.10

How to fix

Upgrade to a fixed version: Linux kernel 5.15.209, 6.1.175, 6.12.91, 6.18.33. Check the vendor advisory for mitigations.

References

• https://git.kernel.org/stable/c/3b28eb75afe520972bacc833850c2b30aa0824cd
• https://git.kernel.org/stable/c/49d9be0722da3a4a893ba905720cba1921834ec3
• https://git.kernel.org/stable/c/98e8bf249c790d56de1abc4a5f8bd68035a00921
• https://git.kernel.org/stable/c/bf5fcd9c37c2546beaf7b401d31aefd89017dc3d
• https://git.kernel.org/stable/c/ca95342cb1b39062a03c115830286f0a426053d5
• https://git.kernel.org/stable/c/f2f225cf505ac016132ded21690f3ba0a080a4e8
• https://git.kernel.org/stable/c/fe2c8d051150b90b3ccb85f89e3b1d636cb88ec8

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