ksmbd: defer connection scavenging while session locks are busy

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Summary

CVECVE-2026-99276
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-11-07 14:17:02 UTC
Updated2026-11-07 14:17:02 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ksmbd: defer connection scavenging while session locks are busy The expiration worker holds conn_list_lock for reading while checking for authenticated sessions. Without this change, the check can wait for conn->session_lock or sessions_table_lock. In destroy_previous_session(), the status updates after ksmbd_conn_wait_idle_sess() run with both session locks held for writing. Both the KSMBD_SESS_GOOD error path and the KSMBD_SESS_NEED_SETUP success path call ksmbd_all_conn_set_status(), which takes conn_list_lock for reading. A writer queued on conn_list_lock can block these new read acquisitions. The worker then waits for a session lock held by destroy_previous_session(), which waits behind the writer. The writer cannot proceed until the worker releases conn_list_lock. Try both session locks instead of waiting in the scavenging check. Keep the connection when either lock is busy and let the periodic worker retry later.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d7fd1f98607f2cd358e583f9548bdf0173090a86 4e4e8b38994a0b0fc23f00ca6698b469a41abe70 git Not specified
CNA Linux Linux affected d7fd1f98607f2cd358e583f9548bdf0173090a86 b4bae7af1154089be87c7475218264fcbfd16d10 git Not specified
CNA Linux Linux affected c99ea7855124ca1428a1e59c2b4590aaef34eacf git Not specified
CNA Linux Linux affected 7.2.8 7.3 semver Not specified
CNA Linux Linux affected 7.3 Not specified
CNA Linux Linux unaffected 7.3 semver Not specified
CNA Linux Linux unaffected 7.3.2 7.3.* semver Not specified
CNA Linux Linux unaffected 7.4-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b4bae7af1154089be87c7475218264fcbfd16d10 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4e4e8b38994a0b0fc23f00ca6698b469a41abe70 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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NVD vulnerability detail NVD nvd.nist.gov canonical, analysis

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