Bug 2414524 (CVE-2025-40176)

Summary: CVE-2025-40176 kernel: tls: wait for pending async decryptions if tls_strp_msg_hold fails
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedKeywords: Security
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OS: Linux   
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A vulnerability was found in tls_decrypt_sg in net/tls/tls_sw.c in networking subsystem in the Linux Kernel.In this flaw, If it fails to clone of the input skb to hold the reference to the memory it uses may lead a use-after-free.
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Description OSIDB Bzimport 2025-11-12 11:05:26 UTC 
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.
Comment 1 Alexander B 2025-11-13 12:25:54 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025111255-CVE-2025-40176-f2e3@gregkh/T