Bug 2420422 (CVE-2025-40331)

Summary: CVE-2025-40331 kernel: sctp: Prevent TOCTOU out-of-bounds write
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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Description OSIDB Bzimport 2025-12-09 05:02:18 UTC 
In the Linux kernel, the following vulnerability has been resolved:

sctp: Prevent TOCTOU out-of-bounds write

For the following path not holding the sock lock,

  sctp_diag_dump() -> sctp_for_each_endpoint() -> sctp_ep_dump()

make sure not to exceed bounds in case the address list has grown
between buffer allocation (time-of-check) and write (time-of-use).
Comment 1 Alexander B 2025-12-09 12:54:45 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025120910-CVE-2025-40331-ee3c@gregkh/T