CVE-2023-52752 (GCVE-0-2023-52752)
Vulnerability from cvelistv5 – Published: 2024-05-21 15:30 – Updated: 2026-08-05 09:11
VLAI
EPSS
VEX
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
Severity
7.8 (High)
SSVC
Exploitation: none
Automatable: no
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2024-05-22 17:22 UTC
CWE
- CWE-416 - Use After Free
Assigner
References
7 references
Impacted products
7 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 | |
| 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 | |
| linux | linux_kernel |
Unaffected:
6.7
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
6.6.3
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Affected:
1da177e4c3f4
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
6.1.64
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
||
| linux | linux_kernel |
Unaffected:
6.5.13
cpe:2.3:o:linux:linux_kernel:-:*:*:*:*:*:*:* |
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"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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"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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Experimental. This forecast is provided for visualization only and may change without notice. Do not use it for operational decisions.
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.
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.
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