What’s Vulnerable › Vulnerabilities

CVE-2026-53048: gfs2: prevent NULL pointer dereference during unmount

• Severity: medium (CVSS 5.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 0.1% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2026-06-24 · updated 2026-07-21
• Weakness: CWE-476

Description

In the Linux kernel, the following vulnerability has been resolved: gfs2: prevent NULL pointer dereference during unmount When flushing out outstanding glock work during an unmount, gfs2_log_flush() can be called when sdp->sd_jdesc has already been deallocated and sdp->sd_jdesc is NULL. Commit 35264909e9d1 ("gfs2: Fix NULL pointer dereference in gfs2_log_flush") added a check for that to gfs2_log_flush() itself, but it missed the sdp->sd_jdesc dereference in gfs2_log_release(). Fix that.

Affected products

• Linux kernel: from 5.15.200 before 5.15.209; from 6.1.162 before 6.1.175; from 6.6.37 before 6.6.141; from 6.9.8 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/233a0945a4b1dbe3f38c30afb7d05b76c67f1193
• https://git.kernel.org/stable/c/2fc4c868c9060f424fd4a7cacb0aec5082aba4de
• https://git.kernel.org/stable/c/74b4dbb946060a3233604d91859a9abd3708141d
• https://git.kernel.org/stable/c/abd73229f0e886a91a16ea781ab656bd9b4d1ee8
• https://git.kernel.org/stable/c/cec55674354794eddb80b914f73a6bf9b7fc304a
• https://git.kernel.org/stable/c/d8ffae016c4a78693fe1283335d0b6833a9c1366
• https://git.kernel.org/stable/c/e15f16761594e80b15776980b27c35477655a135

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