btrfs: tracepoints: fix sleep while in atomic context in btrfs_sync_file()
Summary
| CVE | CVE-2026-64164 |
|---|---|
| State | PUBLISHED |
| Assigner | Linux |
| Source Priority | CVE Program / NVD first with legacy fallback |
| Published | 2026-07-19 16:17:58 UTC |
| Updated | 2026-07-30 14:59:47 UTC |
| Description | 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(). |
Risk And Classification
EPSS: 0.001650000 probability, percentile 0.060940000 (date 2026-08-02)
Vendor Declared Affected Products
| Source | Vendor | Product | Version | Platforms |
|---|---|---|---|---|
| CNA | Linux | Linux | affected 4a7bab35fad5251c8cb738161152578cd83b6b9c d78b0a80eac36879ef5478707135c446920e134b git | Not specified |
| CNA | Linux | Linux | affected 520e8b4bcf872a534a7bf61ccf880047642df296 4361954f0e158af0530caa1e57f12b531be4658f git | Not specified |
| CNA | Linux | Linux | affected e252db8ca2a01f82d472091f35d549b313278636 6279992c9ba2774901c9d4dd4a481162e2534714 git | Not specified |
| CNA | Linux | Linux | affected c09a7446aab5773f38d6abb25fce99b8e1dfbc97 26b2290baaf6da6add0f782a100766e686a33f4f git | Not specified |
| CNA | Linux | Linux | affected 32372781d664a9b03c40343e96c29d0a6139f97d 12a0487945c09760a5968d9333383014ea294117 git | Not specified |
| CNA | Linux | Linux | affected 2e4adfaec97ee053ad1bdfb5036845e66f7e0d8a c32a7e0e3c73c1c0768556a56bd78de9f7b83780 git | Not specified |
| CNA | Linux | Linux | affected a85b46db143fda5869e7d8df8f258ccef5fa1719 0a96d9a85cd2240481297156b9bb72e10b7a8036 git | Not specified |
| CNA | Linux | Linux | affected a85b46db143fda5869e7d8df8f258ccef5fa1719 c73370c677646e86fc4b1780fb07027bdf847375 git | Not specified |
| CNA | Linux | Linux | affected d110d7cdb045715c0b45b0dfd974525bb38f653d git | Not specified |
| CNA | Linux | Linux | affected 6.6.136 6.6.142 semver | Not specified |
| CNA | Linux | Linux | affected 6.12.83 6.12.92 semver | Not specified |
| CNA | Linux | Linux | affected 6.18.24 6.18.34 semver | Not specified |
| CNA | Linux | Linux | affected 6.19.14 6.20 semver | Not specified |
| CNA | Linux | Linux | affected 7.0 | Not specified |
| CNA | Linux | Linux | unaffected 7.0 semver | Not specified |
| CNA | Linux | Linux | unaffected 6.6.142 6.6.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.12.92 6.12.* semver | Not specified |
| CNA | Linux | Linux | unaffected 6.18.34 6.18.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.0.11 7.0.* semver | Not specified |
| CNA | Linux | Linux | unaffected 7.1 * original_commit_for_fix | Not specified |
References
| Reference | Source | Link | Tags |
|---|---|---|---|
| git.kernel.org/stable/c/12a0487945c09760a5968d9333383014ea294117 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/c32a7e0e3c73c1c0768556a56bd78de9f7b83780 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/c73370c677646e86fc4b1780fb07027bdf847375 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/d78b0a80eac36879ef5478707135c446920e134b | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/26b2290baaf6da6add0f782a100766e686a33f4f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/4361954f0e158af0530caa1e57f12b531be4658f | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/0a96d9a85cd2240481297156b9bb72e10b7a8036 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| git.kernel.org/stable/c/6279992c9ba2774901c9d4dd4a481162e2534714 | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 | git.kernel.org | |
| CVE Program record | CVE.ORG | www.cve.org | canonical |
| NVD vulnerability detail | NVD | nvd.nist.gov | canonical, analysis |
No vendor comments have been submitted for this CVE.
There are currently no legacy QID mappings associated with this CVE.