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CVE-2023-52752 (GCVE-0-2023-52752)

Vulnerability from cvelistv5 – Published: 2024-05-21 15:30 – Updated: 2026-08-05 09:11
VLAI
Title
smb: client: fix use-after-free bug in cifs_debug_data_proc_show()
Summary
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix use-after-free bug in cifs_debug_data_proc_show() Skip SMB sessions that are being teared down (e.g. @ses->ses_status == SES_EXITING) in cifs_debug_data_proc_show() to avoid use-after-free in @ses. This fixes the following GPF when reading from /proc/fs/cifs/DebugData while mounting and umounting [ 816.251274] general protection fault, probably for non-canonical address 0x6b6b6b6b6b6b6d81: 0000 [#1] PREEMPT SMP NOPTI ... [ 816.260138] Call Trace: [ 816.260329] <TASK> [ 816.260499] ? die_addr+0x36/0x90 [ 816.260762] ? exc_general_protection+0x1b3/0x410 [ 816.261126] ? asm_exc_general_protection+0x26/0x30 [ 816.261502] ? cifs_debug_tcon+0xbd/0x240 [cifs] [ 816.261878] ? cifs_debug_tcon+0xab/0x240 [cifs] [ 816.262249] cifs_debug_data_proc_show+0x516/0xdb0 [cifs] [ 816.262689] ? seq_read_iter+0x379/0x470 [ 816.262995] seq_read_iter+0x118/0x470 [ 816.263291] proc_reg_read_iter+0x53/0x90 [ 816.263596] ? srso_alias_return_thunk+0x5/0x7f [ 816.263945] vfs_read+0x201/0x350 [ 816.264211] ksys_read+0x75/0x100 [ 816.264472] do_syscall_64+0x3f/0x90 [ 816.264750] entry_SYSCALL_64_after_hwframe+0x6e/0xd8 [ 816.265135] RIP: 0033:0x7fd5e669d381
SSVC
Exploitation: none Automatable: no Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-22 17:22 UTC
CWE
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7f48558e6489d032b1584b0cc9ac4bb11072c034 , < 2abdf136784b7edaec7ffe0f4b461b63f9c4c4de (git)
Affected: 7f48558e6489d032b1584b0cc9ac4bb11072c034 , < 336a066990bb3962c46daf574ace596bda9303ce (git)
Affected: 7f48558e6489d032b1584b0cc9ac4bb11072c034 , < 558817597d5fbd7af31f891b67b0fd20f0d047b7 (git)
Affected: 7f48558e6489d032b1584b0cc9ac4bb11072c034 , < 89929ea46f9cc11ba66d2c64713aa5d5dc723b09 (git)
Affected: 7f48558e6489d032b1584b0cc9ac4bb11072c034 , < 0ab6f842452ce2cae04209d4671ac6289d0aef8a (git)
Affected: 7f48558e6489d032b1584b0cc9ac4bb11072c034 , < d328c09ee9f15ee5a26431f5aad7c9239fa85e62 (git)
Affected: a67172a013953664b1dad03c648200c70b90506c (git)
Affected: 3.12.48 , < 3.13 (semver)
guessed Create a notification for this product.
Linux Linux Affected: 3.13
Unaffected: 0 , < 3.13 (semver)
Unaffected: 5.10.237 , ≤ 5.10.* (semver)
Unaffected: 5.15.181 , ≤ 5.15.* (semver)
Unaffected: 6.1.64 , ≤ 6.1.* (semver)
Unaffected: 6.5.13 , ≤ 6.5.* (semver)
Unaffected: 6.6.3 , ≤ 6.6.* (semver)
Unaffected: 6.7 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
linux linux_kernel Unaffected: 6.7
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
Create a notification for this product.
linux linux_kernel Unaffected: 6.6.3
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
Create a notification for this product.
linux linux_kernel Affected: 1da177e4c3f4
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
Create a notification for this product.
linux linux_kernel Unaffected: 6.1.64
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
Create a notification for this product.
linux linux_kernel Unaffected: 6.5.13
    cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:*
Create a notification for this product.
Show details on NVD website

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              "value": "AV:L - The vulnerable code is reached by reading /proc/fs/cifs/DebugData via local syscalls (vfs_read \u2192 seq_read_iter \u2192 cifs_debug_data_proc_show), not by processing remote SMB packets; this is the CIFS client debug interface.\nAC:L - The attacker can control both sides of the race by concurrently mounting/unmounting CIFS shares while repeatedly reading DebugData, making the UAF reliably triggerable without depending on unrelated system state.\nPR:L - DebugData is created with mode 0 which becomes world-readable (0444), so any unprivileged local user can hit the vulnerable show path; session teardown is reachable without real root via user/setuid CIFS mounts or multiuser-mount session prune.\nUI:N - No victim action is required; the attacker alone can open/read the proc file and induce session teardown through their own mount/session activity.\nS:U - This is a standard in-kernel UAF enabling local privilege escalation within the same host kernel authority; it does not cross VM, IOMMU, or other security boundaries.\nC:H - Use-after-free of session/tcon objects (demonstrated via SLAB poison 0x6b\u2026 in cifs_debug_tcon) allows reclaim and attacker-controlled contents, enabling arbitrary kernel memory disclosure.\nI:H - The same UAF of heap objects used during debug iteration can be turned into write/control-flow primitives via heap spraying, enabling integrity compromise and code execution in the kernel.\nA:H - The bug causes a kernel general protection fault/oops when freed tcon memory is accessed, so availability impact is a full kernel crash even without further exploitation."
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            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix use-after-free bug in cifs_debug_data_proc_show()\n\nSkip SMB sessions that are being teared down\n(e.g. @ses-\u003eses_status == SES_EXITING) in cifs_debug_data_proc_show()\nto avoid use-after-free in @ses.\n\nThis fixes the following GPF when reading from /proc/fs/cifs/DebugData\nwhile mounting and umounting\n\n  [ 816.251274] general protection fault, probably for non-canonical\n  address 0x6b6b6b6b6b6b6d81: 0000 [#1] PREEMPT SMP NOPTI\n  ...\n  [  816.260138] Call Trace:\n  [  816.260329]  \u003cTASK\u003e\n  [  816.260499]  ? die_addr+0x36/0x90\n  [  816.260762]  ? exc_general_protection+0x1b3/0x410\n  [  816.261126]  ? asm_exc_general_protection+0x26/0x30\n  [  816.261502]  ? cifs_debug_tcon+0xbd/0x240 [cifs]\n  [  816.261878]  ? cifs_debug_tcon+0xab/0x240 [cifs]\n  [  816.262249]  cifs_debug_data_proc_show+0x516/0xdb0 [cifs]\n  [  816.262689]  ? seq_read_iter+0x379/0x470\n  [  816.262995]  seq_read_iter+0x118/0x470\n  [  816.263291]  proc_reg_read_iter+0x53/0x90\n  [  816.263596]  ? srso_alias_return_thunk+0x5/0x7f\n  [  816.263945]  vfs_read+0x201/0x350\n  [  816.264211]  ksys_read+0x75/0x100\n  [  816.264472]  do_syscall_64+0x3f/0x90\n  [  816.264750]  entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n  [  816.265135] RIP: 0033:0x7fd5e669d381"
          },
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            "lang": "es",
            "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: smb: cliente: corrige el error de use after free en cifs_debug_data_proc_show(). Omitir sesiones SMB que se est\u00e1n eliminando (por ejemplo, @ses-\u0026gt;ses_status == SES_EXITING) en cifs_debug_data_proc_show() para evitar el use after free en @ses. Esto corrige el siguiente GPF al leer desde /proc/fs/cifs/DebugData mientras se monta y desmonta [816.251274] falla de protecci\u00f3n general, probablemente para la direcci\u00f3n no can\u00f3nica 0x6b6b6b6b6b6b6d81: 0000 [#1] PREEMPT SMP NOPTI... [816.260138] Llamada Seguimiento: [816.260329]  [816.260499] ? die_addr+0x36/0x90 [816.260762]? exc_general_protection+0x1b3/0x410 [816.261126]? asm_exc_general_protection+0x26/0x30 [816.261502]? cifs_debug_tcon+0xbd/0x240 [cifs] [816.261878]? cifs_debug_tcon+0xab/0x240 [cifs] [816.262249] cifs_debug_data_proc_show+0x516/0xdb0 [cifs] [816.262689]? seq_read_iter+0x379/0x470 [816.262995] seq_read_iter+0x118/0x470 [816.263291] proc_reg_read_iter+0x53/0x90 [816.263596] ? srso_alias_return_thunk+0x5/0x7f [ 816.263945] vfs_read+0x201/0x350 [ 816.264211] ksys_read+0x75/0x100 [ 816.264472] do_syscall_64+0x3f/0x90 [ 816.2647 50] entrada_SYSCALL_64_after_hwframe+0x6e/0xd8 [816.265135] RIP: 0033:0x7fd5e669d381"
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                  "lessThanOrEqual": "6.5.*",
                  "status": "unaffected",
                  "version": "6.5.13",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "6.6.*",
                  "status": "unaffected",
                  "version": "6.6.3",
                  "versionType": "semver"
                },
                {
                  "lessThanOrEqual": "*",
                  "status": "unaffected",
                  "version": "6.7",
                  "versionType": "original_commit_for_fix"
                }
              ]
            }
          ],
          "cpeApplicability": [
            {
              "nodes": [
                {
                  "cpeMatch": [
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.10.237",
                      "versionStartIncluding": "3.13",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "5.15.181",
                      "versionStartIncluding": "3.13",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.1.64",
                      "versionStartIncluding": "3.13",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.5.13",
                      "versionStartIncluding": "3.13",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.6.3",
                      "versionStartIncluding": "3.13",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionEndExcluding": "6.7",
                      "versionStartIncluding": "3.13",
                      "vulnerable": true
                    },
                    {
                      "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                      "versionStartIncluding": "3.12.48",
                      "vulnerable": true
                    }
                  ],
                  "negate": false,
                  "operator": "OR"
                }
              ]
            }
          ],
          "descriptions": [
            {
              "lang": "en",
              "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nsmb: client: fix use-after-free bug in cifs_debug_data_proc_show()\n\nSkip SMB sessions that are being teared down\n(e.g. @ses-\u003eses_status == SES_EXITING) in cifs_debug_data_proc_show()\nto avoid use-after-free in @ses.\n\nThis fixes the following GPF when reading from /proc/fs/cifs/DebugData\nwhile mounting and umounting\n\n  [ 816.251274] general protection fault, probably for non-canonical\n  address 0x6b6b6b6b6b6b6d81: 0000 [#1] PREEMPT SMP NOPTI\n  ...\n  [  816.260138] Call Trace:\n  [  816.260329]  \u003cTASK\u003e\n  [  816.260499]  ? die_addr+0x36/0x90\n  [  816.260762]  ? exc_general_protection+0x1b3/0x410\n  [  816.261126]  ? asm_exc_general_protection+0x26/0x30\n  [  816.261502]  ? cifs_debug_tcon+0xbd/0x240 [cifs]\n  [  816.261878]  ? cifs_debug_tcon+0xab/0x240 [cifs]\n  [  816.262249]  cifs_debug_data_proc_show+0x516/0xdb0 [cifs]\n  [  816.262689]  ? seq_read_iter+0x379/0x470\n  [  816.262995]  seq_read_iter+0x118/0x470\n  [  816.263291]  proc_reg_read_iter+0x53/0x90\n  [  816.263596]  ? srso_alias_return_thunk+0x5/0x7f\n  [  816.263945]  vfs_read+0x201/0x350\n  [  816.264211]  ksys_read+0x75/0x100\n  [  816.264472]  do_syscall_64+0x3f/0x90\n  [  816.264750]  entry_SYSCALL_64_after_hwframe+0x6e/0xd8\n  [  816.265135] RIP: 0033:0x7fd5e669d381"
            }
          ],
          "metrics": [
            {
              "cvssV3_1": {
                "baseScore": 7.8,
                "baseSeverity": "HIGH",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
                "version": "3.1"
              },
              "scenarios": [
                {
                  "lang": "en",
                  "value": "AV:L - The vulnerable code is reached by reading /proc/fs/cifs/DebugData via local syscalls (vfs_read \u2192 seq_read_iter \u2192 cifs_debug_data_proc_show), not by processing remote SMB packets; this is the CIFS client debug interface.\nAC:L - The attacker can control both sides of the race by concurrently mounting/unmounting CIFS shares while repeatedly reading DebugData, making the UAF reliably triggerable without depending on unrelated system state.\nPR:L - DebugData is created with mode 0 which becomes world-readable (0444), so any unprivileged local user can hit the vulnerable show path; session teardown is reachable without real root via user/setuid CIFS mounts or multiuser-mount session prune.\nUI:N - No victim action is required; the attacker alone can open/read the proc file and induce session teardown through their own mount/session activity.\nS:U - This is a standard in-kernel UAF enabling local privilege escalation within the same host kernel authority; it does not cross VM, IOMMU, or other security boundaries.\nC:H - Use-after-free of session/tcon objects (demonstrated via SLAB poison 0x6b\u2026 in cifs_debug_tcon) allows reclaim and attacker-controlled contents, enabling arbitrary kernel memory disclosure.\nI:H - The same UAF of heap objects used during debug iteration can be turned into write/control-flow primitives via heap spraying, enabling integrity compromise and code execution in the kernel.\nA:H - The bug causes a kernel general protection fault/oops when freed tcon memory is accessed, so availability impact is a full kernel crash even without further exploitation."
                }
              ]
            }
          ],
          "providerMetadata": {
            "dateUpdated": "2026-08-05T09:11:13.755Z",
            "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
            "shortName": "Linux"
          },
          "references": [
            {
              "url": "https://git.kernel.org/stable/c/2abdf136784b7edaec7ffe0f4b461b63f9c4c4de"
            },
            {
              "url": "https://git.kernel.org/stable/c/336a066990bb3962c46daf574ace596bda9303ce"
            },
            {
              "url": "https://git.kernel.org/stable/c/558817597d5fbd7af31f891b67b0fd20f0d047b7"
            },
            {
              "url": "https://git.kernel.org/stable/c/89929ea46f9cc11ba66d2c64713aa5d5dc723b09"
            },
            {
              "url": "https://git.kernel.org/stable/c/0ab6f842452ce2cae04209d4671ac6289d0aef8a"
            },
            {
              "url": "https://git.kernel.org/stable/c/d328c09ee9f15ee5a26431f5aad7c9239fa85e62"
            }
          ],
          "title": "smb: client: fix use-after-free bug in cifs_debug_data_proc_show()",
          "x_generator": {
            "engine": "bippy-1.2.0"
          }
        }
      },
      "cveMetadata": {
        "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "assignerShortName": "Linux",
        "cveId": "CVE-2023-52752",
        "datePublished": "2024-05-21T15:30:40.901Z",
        "dateReserved": "2024-05-21T15:19:24.234Z",
        "dateUpdated": "2026-08-05T09:11:13.755Z",
        "state": "PUBLISHED"
      },
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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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

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