ksmbd: scope conn->binding slowpath to bound sessions only

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Summary

CVECVE-2026-52911
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-06-21 08:16:23 UTC
Updated2026-06-21 08:16:23 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ksmbd: scope conn->binding slowpath to bound sessions only When the binding SESSION_SETUP sets conn->binding = true, the flag stays set after the call so that the global session lookup in ksmbd_session_lookup_all() can find the session, which was not added to conn->sessions. Because the flag is connection-wide, the global lookup path will also resolve any other session by id if asked. Tighten the global lookup so that the returned session must have this connection registered in its channel xarray (sess->ksmbd_chann_list). The channel entry is installed by the existing binding_session path in ntlm_authenticate()/krb5_authenticate() when a SESSION_SETUP completes successfully, so this condition is a strict equivalent of "this connection has been accepted as a channel of this session". Connections that have not bound to a given session cannot reach it via the global table. The existing conn->binding gate for entering the slowpath is preserved so that non-binding connections keep the fast-path-only behavior, and the session->state check is unchanged.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f5a544e3bab78142207e0242d22442db85ba1eff e74c00c6af428a39e564cdc5bd3a3648c6d8de87 git Not specified
CNA Linux Linux affected f5a544e3bab78142207e0242d22442db85ba1eff e3a93ce6e25757b8f375e38b8f91e1d9da4edc1a git Not specified
CNA Linux Linux affected f5a544e3bab78142207e0242d22442db85ba1eff 1ff46c9915c1cbf454db58a8cb87f7cac818e6a6 git Not specified
CNA Linux Linux affected f5a544e3bab78142207e0242d22442db85ba1eff 974c1c224e85549dc3459f3bb2255bbbdd2b9372 git Not specified
CNA Linux Linux affected f5a544e3bab78142207e0242d22442db85ba1eff 2cc8a4db633b10715450b291c1343859a4b2c509 git Not specified
CNA Linux Linux affected f5a544e3bab78142207e0242d22442db85ba1eff 1e2bec062c5c9ec282636715166056d0998d746d git Not specified
CNA Linux Linux affected f5a544e3bab78142207e0242d22442db85ba1eff b0da97c034b6107d14e537e212d4ce8b22109a58 git Not specified
CNA Linux Linux affected 5.15 Not specified
CNA Linux Linux unaffected 5.15 semver Not specified
CNA Linux Linux unaffected 5.15.209 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.175 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.141 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.91 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.33 6.18.* semver Not specified
CNA Linux Linux unaffected 7.0.10 7.0.* semver Not specified
CNA Linux Linux unaffected 7.1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/e3a93ce6e25757b8f375e38b8f91e1d9da4edc1a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/974c1c224e85549dc3459f3bb2255bbbdd2b9372 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/2cc8a4db633b10715450b291c1343859a4b2c509 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b0da97c034b6107d14e537e212d4ce8b22109a58 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1e2bec062c5c9ec282636715166056d0998d746d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/1ff46c9915c1cbf454db58a8cb87f7cac818e6a6 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e74c00c6af428a39e564cdc5bd3a3648c6d8de87 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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