Bug 2432367 (CVE-2025-71148)

Summary: CVE-2025-71148 kernel: net/handshake: restore destructor on submit failure
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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A socket leak vulnerability was found in the Linux kernel's TLS handshake subsystem. When handshake_req_submit() fails before the request is hashed, it does not restore the original sk->sk_destruct pointer. This causes handshake_sk_destruct() to return early without calling the original destructor, resulting in a socket resource leak that accumulates over time.
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Description OSIDB Bzimport 2026-01-23 15:02:53 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net/handshake: restore destructor on submit failure

handshake_req_submit() replaces sk->sk_destruct but never restores it when
submission fails before the request is hashed. handshake_sk_destruct() then
returns early and the original destructor never runs, leaking the socket.
Restore sk_destruct on the error path.
Comment 1 Keith Grant 2026-01-23 18:01:34 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026012327-CVE-2025-71148-78e6@gregkh/T