{"id":"CVE-2026-64164","state":"PUBLISHED","title":"btrfs: tracepoints: fix sleep while in atomic context in btrfs_sync_file()","description":"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().","publishedAt":"2026-07-19T15:40:49.894Z","updatedAt":"2026-07-19T15:40:49.894Z","severity":null,"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4a7bab35fad5251c8cb738161152578cd83b6b9c","status":"affected","lessThan":"d78b0a80eac36879ef5478707135c446920e134b","versionType":"git"},{"version":"520e8b4bcf872a534a7bf61ccf880047642df296","status":"affected","lessThan":"4361954f0e158af0530caa1e57f12b531be4658f","versionType":"git"},{"version":"e252db8ca2a01f82d472091f35d549b313278636","status":"affected","lessThan":"6279992c9ba2774901c9d4dd4a481162e2534714","versionType":"git"},{"version":"c09a7446aab5773f38d6abb25fce99b8e1dfbc97","status":"affected","lessThan":"26b2290baaf6da6add0f782a100766e686a33f4f","versionType":"git"},{"version":"32372781d664a9b03c40343e96c29d0a6139f97d","status":"affected","lessThan":"12a0487945c09760a5968d9333383014ea294117","versionType":"git"},{"version":"2e4adfaec97ee053ad1bdfb5036845e66f7e0d8a","status":"affected","lessThan":"c32a7e0e3c73c1c0768556a56bd78de9f7b83780","versionType":"git"},{"version":"a85b46db143fda5869e7d8df8f258ccef5fa1719","status":"affected","lessThan":"0a96d9a85cd2240481297156b9bb72e10b7a8036","versionType":"git"},{"version":"a85b46db143fda5869e7d8df8f258ccef5fa1719","status":"affected","lessThan":"c73370c677646e86fc4b1780fb07027bdf847375","versionType":"git"},{"version":"d110d7cdb045715c0b45b0dfd974525bb38f653d","status":"affected","versionType":"git"},{"version":"6.6.136","status":"affected","lessThan":"6.6.142","versionType":"semver"},{"version":"6.12.83","status":"affected","lessThan":"6.12.92","versionType":"semver"},{"version":"6.18.24","status":"affected","lessThan":"6.18.34","versionType":"semver"},{"version":"6.19.14","status":"affected","lessThan":"6.20","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/trace/events/btrfs.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"7.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"7.0","versionType":"semver"},{"version":"6.6.142","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.92","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.34","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.11","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/trace/events/btrfs.h"]}],"references":["https://git.kernel.org/stable/c/d78b0a80eac36879ef5478707135c446920e134b","https://git.kernel.org/stable/c/4361954f0e158af0530caa1e57f12b531be4658f","https://git.kernel.org/stable/c/6279992c9ba2774901c9d4dd4a481162e2534714","https://git.kernel.org/stable/c/26b2290baaf6da6add0f782a100766e686a33f4f","https://git.kernel.org/stable/c/12a0487945c09760a5968d9333383014ea294117","https://git.kernel.org/stable/c/c32a7e0e3c73c1c0768556a56bd78de9f7b83780","https://git.kernel.org/stable/c/0a96d9a85cd2240481297156b9bb72e10b7a8036","https://git.kernel.org/stable/c/c73370c677646e86fc4b1780fb07027bdf847375"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:41.951Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/64xxx/CVE-2026-64164.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-64164","state":"PUBLISHED","datePublished":"2026-07-19T15:40:49.894Z","dateUpdated":"2026-07-19T15:40:49.894Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-07-19T07:54:57.038Z"},"containers":{"cna":{"title":"btrfs: tracepoints: fix sleep while in atomic context in btrfs_sync_file()","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()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"4a7bab35fad5251c8cb738161152578cd83b6b9c","status":"affected","lessThan":"d78b0a80eac36879ef5478707135c446920e134b","versionType":"git"},{"version":"520e8b4bcf872a534a7bf61ccf880047642df296","status":"affected","lessThan":"4361954f0e158af0530caa1e57f12b531be4658f","versionType":"git"},{"version":"e252db8ca2a01f82d472091f35d549b313278636","status":"affected","lessThan":"6279992c9ba2774901c9d4dd4a481162e2534714","versionType":"git"},{"version":"c09a7446aab5773f38d6abb25fce99b8e1dfbc97","status":"affected","lessThan":"26b2290baaf6da6add0f782a100766e686a33f4f","versionType":"git"},{"version":"32372781d664a9b03c40343e96c29d0a6139f97d","status":"affected","lessThan":"12a0487945c09760a5968d9333383014ea294117","versionType":"git"},{"version":"2e4adfaec97ee053ad1bdfb5036845e66f7e0d8a","status":"affected","lessThan":"c32a7e0e3c73c1c0768556a56bd78de9f7b83780","versionType":"git"},{"version":"a85b46db143fda5869e7d8df8f258ccef5fa1719","status":"affected","lessThan":"0a96d9a85cd2240481297156b9bb72e10b7a8036","versionType":"git"},{"version":"a85b46db143fda5869e7d8df8f258ccef5fa1719","status":"affected","lessThan":"c73370c677646e86fc4b1780fb07027bdf847375","versionType":"git"},{"version":"d110d7cdb045715c0b45b0dfd974525bb38f653d","status":"affected","versionType":"git"},{"version":"6.6.136","status":"affected","lessThan":"6.6.142","versionType":"semver"},{"version":"6.12.83","status":"affected","lessThan":"6.12.92","versionType":"semver"},{"version":"6.18.24","status":"affected","lessThan":"6.18.34","versionType":"semver"},{"version":"6.19.14","status":"affected","lessThan":"6.20","versionType":"semver"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/trace/events/btrfs.h"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"7.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"7.0","versionType":"semver"},{"version":"6.6.142","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.92","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.34","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.0.11","status":"unaffected","lessThanOrEqual":"7.0.*","versionType":"semver"},{"version":"7.1","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["include/trace/events/btrfs.h"]}],"references":[{"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"},{"url":"https://git.kernel.org/stable/c/12a0487945c09760a5968d9333383014ea294117"},{"url":"https://git.kernel.org/stable/c/c32a7e0e3c73c1c0768556a56bd78de9f7b83780"},{"url":"https://git.kernel.org/stable/c/0a96d9a85cd2240481297156b9bb72e10b7a8036"},{"url":"https://git.kernel.org/stable/c/c73370c677646e86fc4b1780fb07027bdf847375"}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-07-19T15:40:49.894Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.6.136","versionEndExcluding":"6.6.142"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.12.83","versionEndExcluding":"6.12.92"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.18.24","versionEndExcluding":"6.18.34"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.0.11"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"7.0","versionEndExcluding":"7.1"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"6.19.14"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}