CVE-2025-40242
In the Linux kernel, the following vulnerability has been resolved: gfs2: Fix unlikely race in gdlm_put_lock In gdlm_put_lock(), there is a small window of time in which the DFL_UNMOUNT flag has been set but the lockspace hasn't been released, yet. In that window, dlm may still call gdlm_ast() and gdlm_bast(). To prevent it from dereferencing freed glock objects, only free the glock if the lockspace has actually been released.
Affected versions
Linux kernel versions
4.4.284,
4.9.283,
4.14.247,
4.19.207,
5.4.148,
5.10.67,
5.13.19,
5.14.6,
5.15
and later are affected. Fixed in
6.1.168,
6.6.131,
6.12.56,
6.17.6,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40242 including vendor advisories, patch commits, exploit details, and third-party analysis. Links are sourced from the NIST NVD database.
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PatchKernel patch commithttps://git.kernel.org/stable/c/279bde3bbb0ac0bad5c729dfa85983d75a5d7641
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PatchKernel patch commithttps://git.kernel.org/stable/c/28c4d9bc0708956c1a736a9e49fee71b65deee81
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PatchKernel patch commithttps://git.kernel.org/stable/c/4913592a3358f6ec366b8346b733d5e2360b08e1
Frequently asked questions
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What is CVE-2025-40242?
CVE-2025-40242 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 4.4.284 onward and has been patched in 6.1.168, 6.6.131, 6.12.56 and others. CVE-2025-40242 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2025-40242?
Yes — CVE-2025-40242 has been patched. Fixed versions include 6.1.168, 6.6.131, 6.12.56 and others. If you are running Linux kernel 4.4.284 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40242 actively exploited?
No — CVE-2025-40242 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.