cifs: fix potential oops in cifs_oplock_break

{
  "id": "812910f3e968b8931eb66e7ad3a7db9746f44e91051d775bd41e1a4e58550eff",
  "url": "https://osv.dev/vulnerability/CVE-2023-54258",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "cifs: fix potential oops in cifs_oplock_break",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: cifs: fix potential oops in cifs_oplock_break With deferred close we can have closes that race with lease breaks, and so with the current checks for whether to send the lease response, oplock_response(), this can mean that an unmount (kill_sb) can occur just before we were checking if the tcon->ses is valid. See below: [Fri Aug 4 04:12:50 2023] RIP: 0010:cifs_oplock_break+0x1f7/0x5b0 [cifs] [Fri Aug 4 04:12:50 2023] Code: 7d a8 48 8b 7d c0 c0 e9 02 48 89 45 b8 41 89 cf e8 3e f5 ff ff 4c 89 f7 41 83 e7 01 e8 82 b3 03 f2 49 8b 45 50 48 85 c0 74 5e <48> 83 78 60 00 74 57 45 84 ff 75 52 48 8b 43 98 48 83 eb 68 48 39 [Fri Aug 4 04:12:50 2023] RSP: 0018:ffffb30607ddbdf8 EFLAGS: 00010206 [Fri Aug 4 04:12:50 2023] RAX: 632d223d32612022 RBX: ffff97136944b1e0 RCX: 0000000080100009 [Fri Aug 4 04:12:50 2023] RDX: 0000000000000001 RSI: 0000000080100009 RDI: ffff97136944b188 [Fri Aug 4 04:12:50 2023] RBP: ffffb30607ddbe58 R08: 0000000000000001 R09: ffffffffc08e0900 [Fri Aug 4 04:12:50 2023] R10: 0000000000000001 R11: 000000000000000f R12: ffff97136944b138 [Fri Aug 4 04:12:50 2023] R13: ffff97149147c000 R14: ffff97136944b188 R15: 0000000000000000 [Fri Aug 4 04:12:50 2023] FS: 0000000000000000(0000) GS:ffff9714f7c00000(0000) knlGS:0000000000000000 [Fri Aug 4 04:12:50 2023] CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 [Fri Aug 4 04:12:50 2023] CR2: 00007fd8de9c7590 CR3: 000000011228e000 CR4: 0000000000350ef0 [Fri Aug 4 04",
    "evidence": "osv:CVE-2023-54258",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
          {
            "value": "5.15.128",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.1.47",
            "evidence": "/affected/1/ranges"
          },
          {
            "value": "6.4.12",
            "evidence": "/affected/1/ranges"
          }
        ],
        "affected_versions": []
      }
    ],
    "severity": "critical",
    "structured": {
      "id": "CVE-2023-54258",
      "aliases": [
        "CVE-2023-54258"
      ],
      "metrics": [
        {
          "type": "CVSS_V3",
          "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"
        }
      ],
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            "v6.4.6",
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            "name": "Kernel",
            "ecosystem": "Linux"
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          }
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      ],
      "modified": "2026-10-28T02:30:38.150905473Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/5ee28bcfbaacf289eb25c662a2862542ea6ce6a7",
        "https://git.kernel.org/stable/c/6b67a6d2e50634fe127e656147c81915955e9f5e",
        "https://git.kernel.org/stable/c/b99f490ea87ebcca3a429fd8837067feb56a4c7c",
        "https://git.kernel.org/stable/c/e8f5f849ffce24490eb9449e98312b66c0dba76f",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54258.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-54258",
        "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"
      ],
      "provider_metadata": {
        "cna_assigner": "Linux",
        "osv_generated_from": "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/54xxx/CVE-2023-54258.json"
      }
    },
    "related_cves": [
      {
        "value": "CVE-2023-54258",
        "evidence": "/id"
      }
    ],
    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
  },
  "source_id": "core-osv",
  "document_id": 504997,
  "published_at": "2025-12-30T12:15:52.855+00:00"
}