CVE-2026-90167 (GCVE-0-2026-90167)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:06 – Updated: 2026-10-30 12:34
VLAI
Title
ksmbd: serialize oplock close with pending break ownership
Summary
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.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6638 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 02a31a30ccd09f3ff35ab5861c04209c381aa5dd (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 7148a6c06ddf1c263a1cf422bee541f24d3d3926 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 7d6e682b7633120c2f93400b8c6f335d9d8e5318 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < dc1e34f78dfab755fab9ad820ac5f82348fe1792 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < 5f97bac88bfb333f426f01c118b8235e75af8d96 (git)
Affected: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 , < b0148dc5625dbfd50596ac63c7487c12e8a8ab03 (git)
guessed Create a notification for this product.
Linux Linux Affected: 5.15
Unaffected: 0 , < 5.15 (semver)
Unaffected: 6.1.191 , ≤ 6.1.* (semver)
Unaffected: 6.6.160 , ≤ 6.6.* (semver)
Unaffected: 6.12.114 , ≤ 6.12.* (semver)
Unaffected: 6.18.57 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nksmbd: serialize oplock close with pending break ownership\n\nclose may abort an in-flight oplock break while another breaker already\nholds an opinfo reference. Releasing pending_break wakes that waiter, but\nwithout serializing the close transition with bit acquisition it can become\na new break owner through the test_and_set_bit() fast path. It can then\noverwrite OPLOCK_CLOSING with OPLOCK_ACK_WAIT and continue a break for\na dying opinfo.\n\nMake OPLOCK_CLOSING terminal once the opinfo is removed from the inode\nlist. Serialize that transition, pending_break acquisition, and\nOPLOCK_ACK_WAIT setup with an opinfo state lock. A breaker which loses\nthe race releases its ownership and returns -ENOENT. Explicitly wake\npending_break waiters during close so they can observe the terminal state.\n\nAlso prevent ACK and timeout paths from replacing OPLOCK_CLOSING with\nOPLOCK_STATE_NONE."
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      "cve": "CVE-2026-90167",
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      "title": "kernel: ksmbd: serialize oplock close with pending break ownership",
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      "cve": "CVE-2026-90167",
      "id": "CVE-2026-90167",
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      "title": "SUSE CVE CVE-2026-90167",
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  }
}



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