FKIE_CVE-2026-64164

Vulnerability from fkie_nvd - Published: 2026-07-19 16:17 - Updated: 2026-08-13 15:33
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
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: [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 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().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0a96d9a85cd2240481297156b9bb72e10b7a8036Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/12a0487945c09760a5968d9333383014ea294117Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/26b2290baaf6da6add0f782a100766e686a33f4fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4361954f0e158af0530caa1e57f12b531be4658fPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/6279992c9ba2774901c9d4dd4a481162e2534714Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c32a7e0e3c73c1c0768556a56bd78de9f7b83780Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/c73370c677646e86fc4b1780fb07027bdf847375Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d78b0a80eac36879ef5478707135c446920e134bPatch
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.0
linux linux_kernel 7.1
linux linux_kernel 7.1
linux linux_kernel 7.1
To clipboard 

{
  "affected": [
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          "product": "Linux",
          "programFiles": [
            "include/trace/events/btrfs.h"
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/trace/events/btrfs.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "7.0"
            },
            {
              "lessThan": "7.0",
              "status": "unaffected",
              "version": "0",
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              "status": "unaffected",
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              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
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  ],
  "cveTags": [],
  "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] [\u003c0000000000000000\u003e] 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]  \u003cTASK\u003e\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-\u003ed_parent. This is also what ext4 is doing in\nits equivalent trace event ext4_sync_file_enter()."
    }
  ],
  "id": "CVE-2026-64164",
  "lastModified": "2026-08-13T15:33:00.410",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ]
  },
  "published": "2026-07-19T16:17:58.450",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/0a96d9a85cd2240481297156b9bb72e10b7a8036"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/12a0487945c09760a5968d9333383014ea294117"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
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      "url": "https://git.kernel.org/stable/c/26b2290baaf6da6add0f782a100766e686a33f4f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/4361954f0e158af0530caa1e57f12b531be4658f"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      "url": "https://git.kernel.org/stable/c/6279992c9ba2774901c9d4dd4a481162e2534714"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
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      ],
      "url": "https://git.kernel.org/stable/c/c32a7e0e3c73c1c0768556a56bd78de9f7b83780"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/c73370c677646e86fc4b1780fb07027bdf847375"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/d78b0a80eac36879ef5478707135c446920e134b"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Analyzed",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-476"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}



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