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CVE-2023-54258 (GCVE-0-2023-54258)

Vulnerability from cvelistv5 – Published: 2025-12-30 12:15 – Updated: 2026-08-05 09:18
VLAI
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 04:12:50 2023] Call Trace: [Fri Aug 4 04:12:50 2023] <TASK> [Fri Aug 4 04:12:50 2023] process_one_work+0x225/0x3d0 [Fri Aug 4 04:12:50 2023] worker_thread+0x4d/0x3e0 [Fri Aug 4 04:12:50 2023] ? process_one_work+0x3d0/0x3d0 [Fri Aug 4 04:12:50 2023] kthread+0x12a/0x150 [Fri Aug 4 04:12:50 2023] ? set_kthread_struct+0x50/0x50 [Fri Aug 4 04:12:50 2023] ret_from_fork+0x22/0x30 [Fri Aug 4 04:12:50 2023] </TASK> To fix this change the ordering of the checks before sending the oplock_response to first check if the openFileList is empty.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 63fb45ddc491895c4b36664e0c2c3b548545ae93 , < b99f490ea87ebcca3a429fd8837067feb56a4c7c (git)
Affected: 1bf709b9625001eefdd41048c5f4c7544ee33394 , < 5ee28bcfbaacf289eb25c662a2862542ea6ce6a7 (git)
Affected: 3b4c15171c3ce9120c81f5564b9367d8d0f4219c , < 6b67a6d2e50634fe127e656147c81915955e9f5e (git)
Affected: da787d5b74983f7525d1eb4b9c0b4aff2821511a , < e8f5f849ffce24490eb9449e98312b66c0dba76f (git)
Affected: cff7fb969edaeff2bc80c8a8f7cf7b0c8df32da7 (git)
Affected: 6.3.13 , < 6.4 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 5.15.121 , < 5.15.128 (semver)
Affected: 6.1.39 , < 6.1.47 (semver)
Affected: 6.4.4 , < 6.4.12 (semver)
guessed Create a notification for this product.
Show details on NVD website
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
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      "descriptions": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncifs: fix potential oops in cifs_oplock_break\n\nWith deferred close we can have closes that race with lease breaks,\nand so with the current checks for whether to send the lease response,\noplock_response(), this can mean that an unmount (kill_sb) can occur\njust before we were checking if the tcon-\u003eses is valid.  See below:\n\n[Fri Aug  4 04:12:50 2023] RIP: 0010:cifs_oplock_break+0x1f7/0x5b0 [cifs]\n[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 \u003c48\u003e 83 78 60 00 74 57 45 84 ff 75 52 48 8b 43 98 48 83 eb 68 48 39\n[Fri Aug  4 04:12:50 2023] RSP: 0018:ffffb30607ddbdf8 EFLAGS: 00010206\n[Fri Aug  4 04:12:50 2023] RAX: 632d223d32612022 RBX: ffff97136944b1e0 RCX: 0000000080100009\n[Fri Aug  4 04:12:50 2023] RDX: 0000000000000001 RSI: 0000000080100009 RDI: ffff97136944b188\n[Fri Aug  4 04:12:50 2023] RBP: ffffb30607ddbe58 R08: 0000000000000001 R09: ffffffffc08e0900\n[Fri Aug  4 04:12:50 2023] R10: 0000000000000001 R11: 000000000000000f R12: ffff97136944b138\n[Fri Aug  4 04:12:50 2023] R13: ffff97149147c000 R14: ffff97136944b188 R15: 0000000000000000\n[Fri Aug  4 04:12:50 2023] FS:  0000000000000000(0000) GS:ffff9714f7c00000(0000) knlGS:0000000000000000\n[Fri Aug  4 04:12:50 2023] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\n[Fri Aug  4 04:12:50 2023] CR2: 00007fd8de9c7590 CR3: 000000011228e000 CR4: 0000000000350ef0\n[Fri Aug  4 04:12:50 2023] Call Trace:\n[Fri Aug  4 04:12:50 2023]  \u003cTASK\u003e\n[Fri Aug  4 04:12:50 2023]  process_one_work+0x225/0x3d0\n[Fri Aug  4 04:12:50 2023]  worker_thread+0x4d/0x3e0\n[Fri Aug  4 04:12:50 2023]  ? process_one_work+0x3d0/0x3d0\n[Fri Aug  4 04:12:50 2023]  kthread+0x12a/0x150\n[Fri Aug  4 04:12:50 2023]  ? set_kthread_struct+0x50/0x50\n[Fri Aug  4 04:12:50 2023]  ret_from_fork+0x22/0x30\n[Fri Aug  4 04:12:50 2023]  \u003c/TASK\u003e\n\nTo fix this change the ordering of the checks before sending the oplock_response\nto first check if the openFileList is empty."
        }
      ],
      "metrics": [
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            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:N - The oplock/lease break is an unsolicited SMB2 notification packet received from the remote server and processed by the cifs demultiplex thread (`is_oplock_break` \u2192 `cifs_queue_oplock_break`), so a malicious/compromised SMB server or an MITM on a non-signed connection triggers the vulnerable work item purely over the network. This matches the treatment of other cifs client bugs driven by server-supplied data, including the identical CVE-2025-38527 in this same function.\nAC:L - The remote server controls the triggering side entirely and can send lease/oplock breaks continuously, and the same break drives `cifs_close_deferred_file()` on the other side; with the last handle the `kfree(tcon)` occurs synchronously inside `_cifsFileInfo_put()` rather than through a narrow window, and unmounts occur automatically in common autofs/automount deployments.\nPR:N - The attacker is the SMB server (or an MITM) and needs no credentials or privileges on the victim client; the client\u0027s own handling of a server-sent break notification is what enters the vulnerable path.\nUI:N - Against an already-mounted share the attack needs no victim action \u2014 the server sends break notifications on its own schedule and the teardown side is reached via deferred-close plus automatic/idle unmount rather than an interactive step.\nS:U - The use-after-free is in kernel memory and its impact stays within the kernel\u0027s own security authority, with no crossing of a VM, IOMMU, or sandbox boundary.\nC:H - The freed `struct cifs_tcon` is dereferenced through a four-level pointer chain (`tcon-\u003eses-\u003eserver-\u003eops`) read from reallocated slab contents, which after heap grooming yields an arbitrary kernel read primitive; the oops itself shows the freed object already refilled with unrelated heap data.\nI:H - The stale pointer terminates in an indirect call `tcon-\u003eses-\u003eserver-\u003eops-\u003eoplock_response(tcon, ...)` where every pointer in the chain and the first argument come from freed, reallocatable memory, giving a control-flow hijack primitive and thus arbitrary kernel code execution.\nA:H - Even unexploited, the bug produces an immediate kernel oops (general protection fault from the non-canonical `ses` pointer in the reported trace), and it can be re-triggered repeatedly by the remote server."
            }
          ]
        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-05T09:18:36.889Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/b99f490ea87ebcca3a429fd8837067feb56a4c7c"
        },
        {
          "url": "https://git.kernel.org/stable/c/5ee28bcfbaacf289eb25c662a2862542ea6ce6a7"
        },
        {
          "url": "https://git.kernel.org/stable/c/6b67a6d2e50634fe127e656147c81915955e9f5e"
        },
        {
          "url": "https://git.kernel.org/stable/c/e8f5f849ffce24490eb9449e98312b66c0dba76f"
        }
      ],
      "title": "cifs: fix potential oops in cifs_oplock_break",
      "x_generator": {
        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2023-54258",
    "datePublished": "2025-12-30T12:15:52.855Z",
    "dateReserved": "2025-12-30T12:06:44.516Z",
    "dateUpdated": "2026-08-05T09:18:36.889Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2023-54258",
      "date": "2026-09-14",
      "epss": "0.00538",
      "percentile": "0.43691"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2023-54258\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-12-30T13:16:14.560\",\"lastModified\":\"2026-08-04T11:16:38.623\",\"vulnStatus\":\"Deferred\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncifs: fix potential oops in cifs_oplock_break\\n\\nWith deferred close we can have closes that race with lease breaks,\\nand so with the current checks for whether to send the lease response,\\noplock_response(), this can mean that an unmount (kill_sb) can occur\\njust before we were checking if the tcon-\u003eses is valid.  See below:\\n\\n[Fri Aug  4 04:12:50 2023] RIP: 0010:cifs_oplock_break+0x1f7/0x5b0 [cifs]\\n[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 \u003c48\u003e 83 78 60 00 74 57 45 84 ff 75 52 48 8b 43 98 48 83 eb 68 48 39\\n[Fri Aug  4 04:12:50 2023] RSP: 0018:ffffb30607ddbdf8 EFLAGS: 00010206\\n[Fri Aug  4 04:12:50 2023] RAX: 632d223d32612022 RBX: ffff97136944b1e0 RCX: 0000000080100009\\n[Fri Aug  4 04:12:50 2023] RDX: 0000000000000001 RSI: 0000000080100009 RDI: ffff97136944b188\\n[Fri Aug  4 04:12:50 2023] RBP: ffffb30607ddbe58 R08: 0000000000000001 R09: ffffffffc08e0900\\n[Fri Aug  4 04:12:50 2023] R10: 0000000000000001 R11: 000000000000000f R12: ffff97136944b138\\n[Fri Aug  4 04:12:50 2023] R13: ffff97149147c000 R14: ffff97136944b188 R15: 0000000000000000\\n[Fri Aug  4 04:12:50 2023] FS:  0000000000000000(0000) GS:ffff9714f7c00000(0000) knlGS:0000000000000000\\n[Fri Aug  4 04:12:50 2023] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[Fri Aug  4 04:12:50 2023] CR2: 00007fd8de9c7590 CR3: 000000011228e000 CR4: 0000000000350ef0\\n[Fri Aug  4 04:12:50 2023] Call Trace:\\n[Fri Aug  4 04:12:50 2023]  \u003cTASK\u003e\\n[Fri Aug  4 04:12:50 2023]  process_one_work+0x225/0x3d0\\n[Fri Aug  4 04:12:50 2023]  worker_thread+0x4d/0x3e0\\n[Fri Aug  4 04:12:50 2023]  ? process_one_work+0x3d0/0x3d0\\n[Fri Aug  4 04:12:50 2023]  kthread+0x12a/0x150\\n[Fri Aug  4 04:12:50 2023]  ? set_kthread_struct+0x50/0x50\\n[Fri Aug  4 04:12:50 2023]  ret_from_fork+0x22/0x30\\n[Fri Aug  4 04:12:50 2023]  \u003c/TASK\u003e\\n\\nTo fix this change the ordering of the checks before sending the oplock_response\\nto first check if the openFileList is empty.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\\n\\ncifs: corrige un posible oops en cifs_oplock_break\\n\\nCon el cierre diferido podemos tener cierres que compiten con las interrupciones de arrendamiento, y as\u00ed, con las comprobaciones actuales para determinar si enviar la respuesta de arrendamiento, oplock_response(), esto puede significar que un desmontaje (kill_sb) puede ocurrir justo antes de que estuvi\u00e9ramos comprobando si tcon-\u0026gt;ses es v\u00e1lido. V\u00e9ase a continuaci\u00f3n:\\n\\n[Fri Aug  4 04:12:50 2023] RIP: 0010:cifs_oplock_break+0x1f7/0x5b0 [cifs]\\n[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 \u0026lt;48\u0026gt; 83 78 60 00 74 57 45 84 ff 75 52 48 8b 43 98 48 83 eb 68 48 39\\n[Fri Aug  4 04:12:50 2023] RSP: 0018:ffffb30607ddbdf8 EFLAGS: 00010206\\n[Fri Aug  4 04:12:50 2023] RAX: 632d223d32612022 RBX: ffff97136944b1e0 RCX: 0000000080100009\\n[Fri Aug  4 04:12:50 2023] RDX: 0000000000000001 RSI: 0000000080100009 RDI: ffff97136944b188\\n[Fri Aug  4 04:12:50 2023] RBP: ffffb30607ddbe58 R08: 0000000000000001 R09: ffffffffc08e0900\\n[Fri Aug  4 04:12:50 2023] R10: 0000000000000001 R11: 000000000000000f R12: ffff97136944b138\\n[Fri Aug  4 04:12:50 2023] R13: ffff97149147c000 R14: ffff97136944b188 R15: 0000000000000000\\n[Fri Aug  4 04:12:50 2023] FS:  0000000000000000(0000) GS:ffff9714f7c00000(0000) knlGS:0000000000000000\\n[Fri Aug  4 04:12:50 2023] CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033\\n[Fri Aug  4 04:12:50 2023] CR2: 00007fd8de9c7590 CR3: 000000011228e000 CR4: 0000000000350ef0\\n[Fri Aug  4 04:12:50 2023] Call Trace:\\n[Fri Aug  4 04:12:50 2023]  \\n[Fri Aug  4 04:12:50 2023]  process_one_work+0x225/0x3d0\\n[Fri Aug  4 04:12:50 2023]  worker_thread+0x4d/0x3e0\\n[Fri Aug  4 04:12:50 2023]  ? process_one_work+0x3d0/0x3d0\\n[Fri Aug  4 04:12:50 2023]  kthread+0x12a/0x150\\n[Fri Aug  4 04:12:50 2023]  ? set_kthread_struct+0x50/0x50\\n[Fri Aug  4 04:12:50 2023]  ret_from_fork+0x22/0x30\\n[Fri Aug  4 04:12:50 2023]  \\n\\nPara solucionar esto, cambie el orden de las comprobaciones antes de enviar la oplock_response para comprobar primero si la openFileList est\u00e1 vac\u00eda.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/smb/client/file.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"63fb45ddc491895c4b36664e0c2c3b548545ae93\",\"lessThan\":\"b99f490ea87ebcca3a429fd8837067feb56a4c7c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"1bf709b9625001eefdd41048c5f4c7544ee33394\",\"lessThan\":\"5ee28bcfbaacf289eb25c662a2862542ea6ce6a7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3b4c15171c3ce9120c81f5564b9367d8d0f4219c\",\"lessThan\":\"6b67a6d2e50634fe127e656147c81915955e9f5e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"da787d5b74983f7525d1eb4b9c0b4aff2821511a\",\"lessThan\":\"e8f5f849ffce24490eb9449e98312b66c0dba76f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"cff7fb969edaeff2bc80c8a8f7cf7b0c8df32da7\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.3.13\",\"lessThan\":\"6.4\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"fs/smb/client/file.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.15.121\",\"lessThan\":\"5.15.128\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.1.39\",\"lessThan\":\"6.1.47\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.4.4\",\"lessThan\":\"6.4.12\",\"versionType\":\"semver\",\"status\":\"affected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/5ee28bcfbaacf289eb25c662a2862542ea6ce6a7\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6b67a6d2e50634fe127e656147c81915955e9f5e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b99f490ea87ebcca3a429fd8837067feb56a4c7c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e8f5f849ffce24490eb9449e98312b66c0dba76f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:12:29+00:00",
      "cve": "CVE-2023-54258",
      "id": "CVE-2023-54258",
      "initial_release_date": "2023-01-01T00:00:00+00:00",
      "product_status:known_affected": "156",
      "product_status:known_not_affected": "118",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: Kernel: Denial of Service in CIFS client due to race condition",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2023/cve-2023-54258.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.