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CVE-2026-90167

ksmbd: serialize oplock close with pending break ownership PUBLISHED

Description (CNA)

In the Linux kernel, the following vulnerability has been resolved: ksmbd: serialize oplock close with pending break ownership close may abort an in-flight oplock break while another breaker already holds an opinfo reference. Releasing pending_break wakes that waiter, but without serializing the close transition with bit acquisition it can become a new break owner through the test_and_set_bit() fast path. It can then overwrite OPLOCK_CLOSING with OPLOCK_ACK_WAIT and continue a break for a dying opinfo. Make OPLOCK_CLOSING terminal once the opinfo is removed from the inode list. Serialize that transition, pending_break acquisition, and OPLOCK_ACK_WAIT setup with an opinfo state lock. A breaker which loses the race releases its ownership and returns -ENOENT. Explicitly wake pending_break waiters during close so they can observe the terminal state. Also prevent ACK and timeout paths from replacing OPLOCK_CLOSING with OPLOCK_STATE_NONE.

Affected (CNA)

Vendor / productVersions
Linux / Linuxaffected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 7148a6c06ddf1c263a1cf422bee541f24d3d3926; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 7d6e682b7633120c2f93400b8c6f335d9d8e5318; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before dc1e34f78dfab755fab9ad820ac5f82348fe1792; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 5f97bac88bfb333f426f01c118b8235e75af8d96; affected e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before b0148dc5625dbfd50596ac63c7487c12e8a8ab03
Linux / Linuxaffected 5.15; unaffected 0 before 5.15; unaffected 6.6.160 through 6.6.*; unaffected 6.12.114 through 6.12.*; unaffected 6.18.57 through 6.18.*; unaffected 7.2.6 through 7.2.*; unaffected 7.3 through *

CWE

No CWE identifiers supplied.

References