CVE-2025-40286
In the Linux kernel, the following vulnerability has been resolved: smb/server: fix possible memory leak in smb2_read() Memory leak occurs when ksmbd_vfs_read() fails. Fix this by adding the missing kvfree().
Affected versions
Linux kernel versions
5.15
and later are affected. Fixed in
6.1.159,
6.6.117,
6.12.59,
6.17.9,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40286 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/0797c6cf3b857cc229ab2bc69552938dcd738d78
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PatchKernel patch commithttps://git.kernel.org/stable/c/63d8706a2c09a0c29b8b0e8a44bc7a1339685de9
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PatchKernel patch commithttps://git.kernel.org/stable/c/6fced056d2cc8d01b326e6fcfabaacb9850b71a4
Frequently asked questions
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What is CVE-2025-40286?
CVE-2025-40286 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 5.15 onward and has been patched in 6.1.159, 6.6.117, 6.12.59 and others. CVE-2025-40286 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-2025-40286?
Yes — CVE-2025-40286 has been patched. Fixed versions include 6.1.159, 6.6.117, 6.12.59 and others. If you are running Linux kernel 5.15 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40286 actively exploited?
No — CVE-2025-40286 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.