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CVE-2026-64164

Estado: AnalizadaMedia (5.5)—

In the Linux kernel, the following vulnerability has been resolved:

btrfs: tracepoints: fix sleep while in atomic context in btrfs_sync_file()

The trace event btrfs_sync_file() is called in an atomic context (all trace events are) and its call to dput(), which is needed due to the call to dget_parent(), can sleep, triggering a kernel splat.

This can be reproduced by enabling the trace event and running btrfs/056 from fstests for example. The splat shown in dmesg is the following:

So stop using dget_parent() and dput() and access the parent dentry directly as dentry->d_parent. This is also what ext4 is doing in its equivalent trace event ext4_sync_file_enter().

Detalles técnicos trazas, registros y código del informe original
  [53.919] BUG: sleeping function called from invalid context at fs/dcache.c:970
  [53.947] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 32773, name: xfs_io
  [53.988] preempt_count: 2, expected: 0
  [53.967] RCU nest depth: 0, expected: 0
  [53.943] Preemption disabled at:
  [53.944] [<0000000000000000>] 0x0
  [54.078] CPU: 0 UID: 0 PID: 32773 Comm: xfs_io Tainted: G        W           7.1.0-rc1-btrfs-next-232+ #1 PREEMPT(full)
  [54.070] Tainted: [W]=WARN
  [54.071] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-0-gea1b7a073390-prebuilt.qemu.org 04/01/2014
  [54.072] Call Trace:
  [54.074]  <TASK>
  [54.076]  dump_stack_lvl+0x56/0x80
  [54.079]  __might_resched.cold+0xd6/0x10f
  [54.072]  dput.part.0+0x24/0x110
  [54.078]  trace_event_raw_event_btrfs_sync_file+0x75/0x140 [btrfs]
  [54.089]  btrfs_sync_file+0x1ed/0x530 [btrfs]
  [54.087]  ? __handle_mm_fault+0x8ae/0xed0
  [54.089]  btrfs_do_write_iter+0x172/0x210 [btrfs]
  [54.091]  vfs_write+0x21f/0x450
  [54.094]  __x64_sys_pwrite64+0x8d/0xc0
  [54.096]  ? do_user_addr_fault+0x20c/0x670
  [54.099]  do_syscall_64+0x60/0xf20
  [54.092]  ? clear_bhb_loop+0x60/0xb0
  [54.094]  entry_SYSCALL_64_after_hwframe+0x76/0x7e

CVSS

Probabilidad de explotación (EPSS)

EPSS (Exploit Prediction Scoring System, de FIRST) estima la probabilidad de que una vulnerabilidad sea explotada en 30 días. Complementa a CVSS (impacto) y a CISA KEV (explotación confirmada).

Tecnologías afectadas (1)

Linux — Linux Kernel

CWE

Referencias

JSON original (NVD)

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{
  "id": "CVE-2026-64164",
  "cveTags": [],
  "metrics": {
    "cvssMetricV31": [
      {
        "type": "Primary",
        "source": "nvd@nist.gov",
        "cvssData": {
          "scope": "UNCHANGED",
          "version": "3.1",
          "baseScore": 5.5,
          "attackVector": "LOCAL",
          "baseSeverity": "MEDIUM",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "integrityImpact": "NONE",
          "userInteraction": "NONE",
          "attackComplexity": "LOW",
          "availabilityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "confidentialityImpact": "NONE"
        },
        "impactScore": 3.6,
        "exploitabilityScore": 1.8
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          "product": "Linux",
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  "published": "2026-07-19T16:17:58.450",
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      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
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  ],
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "type": "Primary",
      "source": "nvd@nist.gov",
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ]
    }
  ],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nbtrfs: tracepoints: fix sleep while in atomic context in btrfs_sync_file()\n\nThe trace event btrfs_sync_file() is called in an atomic context (all trace\nevents are) and its call to dput(), which is needed due to the call to\ndget_parent(), can sleep, triggering a kernel splat.\n\nThis can be reproduced by enabling the trace event and running btrfs/056\nfrom fstests for example. The splat shown in dmesg is the following:\n\n  [53.919] BUG: sleeping function called from invalid context at fs/dcache.c:970\n  [53.947] in_atomic(): 1, irqs_disabled(): 0, non_block: 0, pid: 32773, name: xfs_io\n  [53.988] preempt_count: 2, expected: 0\n  [53.967] RCU nest depth: 0, expected: 0\n  [53.943] Preemption disabled at:\n  [53.944] [<0000000000000000>] 0x0\n  [54.078] CPU: 0 UID: 0 PID: 32773 Comm: xfs_io Tainted: G        W           7.1.0-rc1-btrfs-next-232+ #1 PREEMPT(full)\n  [54.070] Tainted: [W]=WARN\n  [54.071] Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS rel-1.16.2-0-gea1b7a073390-prebuilt.qemu.org 04/01/2014\n  [54.072] Call Trace:\n  [54.074]  <TASK>\n  [54.076]  dump_stack_lvl+0x56/0x80\n  [54.079]  __might_resched.cold+0xd6/0x10f\n  [54.072]  dput.part.0+0x24/0x110\n  [54.078]  trace_event_raw_event_btrfs_sync_file+0x75/0x140 [btrfs]\n  [54.089]  btrfs_sync_file+0x1ed/0x530 [btrfs]\n  [54.087]  ? __handle_mm_fault+0x8ae/0xed0\n  [54.089]  btrfs_do_write_iter+0x172/0x210 [btrfs]\n  [54.091]  vfs_write+0x21f/0x450\n  [54.094]  __x64_sys_pwrite64+0x8d/0xc0\n  [54.096]  ? do_user_addr_fault+0x20c/0x670\n  [54.099]  do_syscall_64+0x60/0xf20\n  [54.092]  ? clear_bhb_loop+0x60/0xb0\n  [54.094]  entry_SYSCALL_64_after_hwframe+0x76/0x7e\n\nSo stop using dget_parent() and dput() and access the parent dentry\ndirectly as dentry->d_parent. This is also what ext4 is doing in\nits equivalent trace event ext4_sync_file_enter()."
    }
  ],
  "lastModified": "2026-08-13T15:33:00.410",
  "configurations": [
    {
      "nodes": [
        {
          "negate": false,
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}