CVE-2026-64164 (GCVE-0-2026-64164)

Vulnerability from cvelistv5 – Published: 2026-07-19 15:40 – Updated: 2026-07-19 15:40
VLAI
Title
btrfs: tracepoints: fix sleep while in atomic context in btrfs_sync_file()
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().
Severity
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 4a7bab35fad5251c8cb738161152578cd83b6b9c , < d78b0a80eac36879ef5478707135c446920e134b (git)
Affected: 520e8b4bcf872a534a7bf61ccf880047642df296 , < 4361954f0e158af0530caa1e57f12b531be4658f (git)
Affected: e252db8ca2a01f82d472091f35d549b313278636 , < 6279992c9ba2774901c9d4dd4a481162e2534714 (git)
Affected: c09a7446aab5773f38d6abb25fce99b8e1dfbc97 , < 26b2290baaf6da6add0f782a100766e686a33f4f (git)
Affected: 32372781d664a9b03c40343e96c29d0a6139f97d , < 12a0487945c09760a5968d9333383014ea294117 (git)
Affected: 2e4adfaec97ee053ad1bdfb5036845e66f7e0d8a , < c32a7e0e3c73c1c0768556a56bd78de9f7b83780 (git)
Affected: a85b46db143fda5869e7d8df8f258ccef5fa1719 , < 0a96d9a85cd2240481297156b9bb72e10b7a8036 (git)
Affected: a85b46db143fda5869e7d8df8f258ccef5fa1719 , < c73370c677646e86fc4b1780fb07027bdf847375 (git)
Affected: d110d7cdb045715c0b45b0dfd974525bb38f653d (git)
Affected: 6.6.136 , < 6.6.142 (semver)
Affected: 6.12.83 , < 6.12.92 (semver)
Affected: 6.18.24 , < 6.18.34 (semver)
Affected: 6.19.14 , < 6.20 (semver)
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Linux Linux Affected: 7.0
Unaffected: 0 , < 7.0 (semver)
Unaffected: 6.6.142 , ≤ 6.6.* (semver)
Unaffected: 6.12.92 , ≤ 6.12.* (semver)
Unaffected: 6.18.34 , ≤ 6.18.* (semver)
Unaffected: 7.0.11 , ≤ 7.0.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
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        {
          "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()."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-07-19T15:40:49.894Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/d78b0a80eac36879ef5478707135c446920e134b"
        },
        {
          "url": "https://git.kernel.org/stable/c/4361954f0e158af0530caa1e57f12b531be4658f"
        },
        {
          "url": "https://git.kernel.org/stable/c/6279992c9ba2774901c9d4dd4a481162e2534714"
        },
        {
          "url": "https://git.kernel.org/stable/c/26b2290baaf6da6add0f782a100766e686a33f4f"
        },
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          "url": "https://git.kernel.org/stable/c/12a0487945c09760a5968d9333383014ea294117"
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          "url": "https://git.kernel.org/stable/c/0a96d9a85cd2240481297156b9bb72e10b7a8036"
        },
        {
          "url": "https://git.kernel.org/stable/c/c73370c677646e86fc4b1780fb07027bdf847375"
        }
      ],
      "title": "btrfs: tracepoints: fix sleep while in atomic context in btrfs_sync_file()",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-64164",
    "datePublished": "2026-07-19T15:40:49.894Z",
    "dateReserved": "2026-07-19T07:54:57.038Z",
    "dateUpdated": "2026-07-19T15:40:49.894Z",
    "state": "PUBLISHED"
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  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-64164",
      "date": "2026-07-20",
      "epss": "0.00164",
      "percentile": "0.06014"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-64164\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-07-19T16:17:58.450\",\"lastModified\":\"2026-07-19T16:17:58.450\",\"vulnStatus\":\"Received\",\"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().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"include/trace/events/btrfs.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4a7bab35fad5251c8cb738161152578cd83b6b9c\",\"lessThan\":\"d78b0a80eac36879ef5478707135c446920e134b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"520e8b4bcf872a534a7bf61ccf880047642df296\",\"lessThan\":\"4361954f0e158af0530caa1e57f12b531be4658f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"e252db8ca2a01f82d472091f35d549b313278636\",\"lessThan\":\"6279992c9ba2774901c9d4dd4a481162e2534714\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c09a7446aab5773f38d6abb25fce99b8e1dfbc97\",\"lessThan\":\"26b2290baaf6da6add0f782a100766e686a33f4f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"32372781d664a9b03c40343e96c29d0a6139f97d\",\"lessThan\":\"12a0487945c09760a5968d9333383014ea294117\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"2e4adfaec97ee053ad1bdfb5036845e66f7e0d8a\",\"lessThan\":\"c32a7e0e3c73c1c0768556a56bd78de9f7b83780\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a85b46db143fda5869e7d8df8f258ccef5fa1719\",\"lessThan\":\"0a96d9a85cd2240481297156b9bb72e10b7a8036\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"a85b46db143fda5869e7d8df8f258ccef5fa1719\",\"lessThan\":\"c73370c677646e86fc4b1780fb07027bdf847375\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"d110d7cdb045715c0b45b0dfd974525bb38f653d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"6.6.136\",\"lessThan\":\"6.6.142\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.12.83\",\"lessThan\":\"6.12.92\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.18.24\",\"lessThan\":\"6.18.34\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"6.19.14\",\"lessThan\":\"6.20\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"include/trace/events/btrfs.h\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7.0\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"7.0\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.142\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.92\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.34\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0.11\",\"lessThanOrEqual\":\"7.0.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/0a96d9a85cd2240481297156b9bb72e10b7a8036\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/12a0487945c09760a5968d9333383014ea294117\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/26b2290baaf6da6add0f782a100766e686a33f4f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4361954f0e158af0530caa1e57f12b531be4658f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6279992c9ba2774901c9d4dd4a481162e2534714\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c32a7e0e3c73c1c0768556a56bd78de9f7b83780\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c73370c677646e86fc4b1780fb07027bdf847375\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d78b0a80eac36879ef5478707135c446920e134b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}



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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

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.


Detection rules are retrieved from Rulezet.