smb: client: fix use-after-free bug in cifs_debug_data_proc_show()

{
  "id": "902a1490cd6c4920486c5bcb0a3a0033077061abebe1323abb5a88cbcc183c75",
  "url": "https://osv.dev/vulnerability/CVE-2023-52752",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "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] [ 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",
    "evidence": "osv:CVE-2023-52752",
    "products": [
      {
        "name": {
          "value": "Kernel",
          "evidence": "/affected/1/package/name"
        },
        "prerequisites": [],
        "fixed_versions": [
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    "severity": "high",
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      "modified": "2026-10-28T02:30:41.117230Z",
      "provider": "osv",
      "references": [
        "https://git.kernel.org/stable/c/0ab6f842452ce2cae04209d4671ac6289d0aef8a",
        "https://git.kernel.org/stable/c/2abdf136784b7edaec7ffe0f4b461b63f9c4c4de",
        "https://git.kernel.org/stable/c/336a066990bb3962c46daf574ace596bda9303ce",
        "https://git.kernel.org/stable/c/558817597d5fbd7af31f891b67b0fd20f0d047b7",
        "https://git.kernel.org/stable/c/89929ea46f9cc11ba66d2c64713aa5d5dc723b09",
        "https://git.kernel.org/stable/c/d328c09ee9f15ee5a26431f5aad7c9239fa85e62",
        "https://lists.debian.org/debian-lts-announce/2025/05/msg00030.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2023/52xxx/CVE-2023-52752.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2023-52752",
        "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/2023/52xxx/CVE-2023-52752.json"
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    "security_relevant": true,
    "severity_evidence": "/severity/0/score"
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  "source_id": "core-osv",
  "document_id": 508802,
  "published_at": "2024-05-21T15:30:40.901+00:00"
}