CVE-2025-40176
In the Linux kernel, the following vulnerability has been resolved: tls: wait for pending async decryptions if tls_strp_msg_hold fails Async decryption calls tls_strp_msg_hold to create a clone of the input skb to hold references to the memory it uses. If we fail to allocate that clone, proceeding with async decryption can lead to various issues (UAF on the skb, writing into userspace memory after the recv() call has returned). In this case, wait for all pending decryption requests.
Affected versions
Linux kernel versions
6.0
and later are affected. Fixed in
6.1.158,
6.6.114,
6.12.55,
6.17.5,
6.18
and their respective stable series.
References
The following references provide additional information about CVE-2025-40176 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/39dec4ea3daf77f684308576baf483b55ca7f160
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PatchKernel patch commithttps://git.kernel.org/stable/c/4fc109d0ab196bd943b7451276690fb6bb48c2e0
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PatchKernel patch commithttps://git.kernel.org/stable/c/9f83fd0c179e0f458e824e417f9d5ad53443f685
Frequently asked questions
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What is CVE-2025-40176?
CVE-2025-40176 is a unscored severity Linux kernel vulnerability . It affects Linux kernel versions from 6.0 onward and has been patched in 6.1.158, 6.6.114, 6.12.55 and others. CVE-2025-40176 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-2025-40176?
Yes — CVE-2025-40176 has been patched. Fixed versions include 6.1.158, 6.6.114, 6.12.55 and others. If you are running Linux kernel 6.0 or later up to the fix versions, apply the relevant patch for your kernel branch.
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Is CVE-2025-40176 actively exploited?
No — CVE-2025-40176 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.