af_unix: read UNIX_DIAG_VFS data under unix_state_lock

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Summary

CVECVE-2026-31673
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-04-25 09:16:00 UTC
Updated2026-04-25 09:16:00 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: af_unix: read UNIX_DIAG_VFS data under unix_state_lock Exact UNIX diag lookups hold a reference to the socket, but not to u->path. Meanwhile, unix_release_sock() clears u->path under unix_state_lock() and drops the path reference after unlocking. Read the inode and device numbers for UNIX_DIAG_VFS while holding unix_state_lock(), then emit the netlink attribute after dropping the lock. This keeps the VFS data stable while the reply is being built.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 5f7b0569460b7d8d01ca776430a00505a68b7584 0c739f3785f84af695952c2bac8be2f45082c9b8 git Not specified
CNA Linux Linux affected 5f7b0569460b7d8d01ca776430a00505a68b7584 900a4e0910e98b8caef117d5df00471fa438dcf9 git Not specified
CNA Linux Linux affected 5f7b0569460b7d8d01ca776430a00505a68b7584 bdf206e740bf2919d818f132c8c9cc7ed91d11c0 git Not specified
CNA Linux Linux affected 5f7b0569460b7d8d01ca776430a00505a68b7584 39897df386376912d561d4946499379effa1e7ef git Not specified
CNA Linux Linux affected 3.3 Not specified
CNA Linux Linux unaffected 3.3 semver Not specified
CNA Linux Linux unaffected 6.12.83 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.24 6.18.* semver Not specified
CNA Linux Linux unaffected 6.19.14 6.19.* semver Not specified
CNA Linux Linux unaffected 7.0 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/900a4e0910e98b8caef117d5df00471fa438dcf9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/0c739f3785f84af695952c2bac8be2f45082c9b8 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/39897df386376912d561d4946499379effa1e7ef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bdf206e740bf2919d818f132c8c9cc7ed91d11c0 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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