CVE-2026-90167 (GCVE-0-2026-90167)
Vulnerability from cvelistv5
Published
2026-09-17 16:06
Modified
2026-10-30 12:34
Severity ?
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9
Version: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9
Version: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9
Version: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9
Version: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9
Version: e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9
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{
  "containers": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "fs/smb/server/oplock.c",
            "fs/smb/server/oplock.h",
            "fs/smb/server/smb2pdu.c"
          ],
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        },
        {
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          "product": "Linux",
          "programFiles": [
            "fs/smb/server/oplock.c",
            "fs/smb/server/oplock.h",
            "fs/smb/server/smb2pdu.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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              "version": "0",
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              "version": "7.3",
              "versionType": "original_commit_for_fix"
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      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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              "negate": false,
              "operator": "OR"
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      "descriptions": [
        {
          "lang": "en",
          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-30T12:34:33.398Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/02a31a30ccd09f3ff35ab5861c04209c381aa5dd"
        },
        {
          "url": "https://git.kernel.org/stable/c/7148a6c06ddf1c263a1cf422bee541f24d3d3926"
        },
        {
          "url": "https://git.kernel.org/stable/c/7d6e682b7633120c2f93400b8c6f335d9d8e5318"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc1e34f78dfab755fab9ad820ac5f82348fe1792"
        },
        {
          "url": "https://git.kernel.org/stable/c/5f97bac88bfb333f426f01c118b8235e75af8d96"
        },
        {
          "url": "https://git.kernel.org/stable/c/b0148dc5625dbfd50596ac63c7487c12e8a8ab03"
        }
      ],
      "title": "ksmbd: serialize oplock close with pending break ownership",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90167",
    "datePublished": "2026-09-17T16:06:56.507Z",
    "dateReserved": "2026-09-11T19:38:34.790Z",
    "dateUpdated": "2026-10-30T12:34:33.398Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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