ksmbd: don't hold ci->m_lock while waiting for a lease break ack

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Summary

CVECVE-2026-98897
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-10-23 12:18:23 UTC
Updated2026-10-26 07:17:14 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ksmbd: don't hold ci->m_lock while waiting for a lease break ack When a cifs.ko client caches a read-handle (RH) lease via deferred close and a conflicting open arrives, ksmbd breaks the lease and waits for the acknowledgment in wait_for_break_ack() for up to OPLOCK_WAIT_TIME (35s). __smb_break_all_levII_oplock() runs that wait while holding ci->m_lock for read. cifs.ko reacts to a handle-lease break by closing the deferred handle rather than sending a lease break acknowledgment. That close path (close_id_del_oplock() -> opinfo_del()) takes ci->m_lock for write and is exactly what would wake the waiter, but it blocks on the read lock held by the waiting thread. The break is then resolved only by the 35s timeout, so xfstests generic/001 takes ~78s with leases enabled versus ~4s with oplocks only. Collect the target opinfos (each pinned with a reference) while holding ci->m_lock, then break them after releasing it, matching how smb_grant_oplock() already breaks a conflicting lease using only a reference. The reference keeps the opinfo (and its conn and lease) alive across the unlocked window, and a close racing the break is handled by the existing OPLOCK_CLOSING state check. Apply the same fix to the parent lease break paths.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected d1c189c6cb8b0fb7b5ee549237d27889c40c2f8b 868c9038ffd4af39766d087f68c8f543a3f66635 git Not specified
CNA Linux Linux affected d1c189c6cb8b0fb7b5ee549237d27889c40c2f8b 27a9bc968d4ae809a3f5ca2f2b136856ee613cb4 git Not specified
CNA Linux Linux affected 16ece7c5645a68efca22a0a69a7718c8e50c3232 git Not specified
CNA Linux Linux affected 6.6.35 6.7 semver Not specified
CNA Linux Linux affected 6.9 Not specified
CNA Linux Linux unaffected 6.9 semver Not specified
CNA Linux Linux unaffected 6.18.53 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/868c9038ffd4af39766d087f68c8f543a3f66635 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/27a9bc968d4ae809a3f5ca2f2b136856ee613cb4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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