CVE-2026-90167ksmbd: serialize oplock close with pending break ownership
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before dc1e34f78dfab755fab9ad820ac5f82348fe1792; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before 5f97bac88bfb333f426f01c118b8235e75af8d96; from e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 before b0148dc5625dbfd50596ac63c7487c12e8a8ab03 | CNA record |
References
- https://git.kernel.org/stable/c/dc1e34f78dfab755fab9ad820ac5f82348fe1792
- https://git.kernel.org/stable/c/5f97bac88bfb333f426f01c118b8235e75af8d96
- https://git.kernel.org/stable/c/b0148dc5625dbfd50596ac63c7487c12e8a8ab03
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.