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CVE-2026-64164

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.1%
Linux•Linux•Versions : <=7.0.*, <c32a7e0e3c73c1c0768556a56bd78de9f7b83780, <=6.12.*, 32372781d664a9b03c40343e96c29d0a6139f97d, 6.12.83, 0, 7.0, <6279992c9ba2774901c9d4dd4a481162e2534714, 6.12.92, <c73370c677646e86fc4b1780fb07027bdf847375, <6.18.34, 6.6.142, <=6.6.*, c09a7446aab5773f38d6abb25fce99b8e1dfbc97, 6.6.136, <d78b0a80eac36879ef5478707135c446920e134b, <7.0, <6.20, 6.18.34, 7.1, <=6.18.*, 7.0.11, <12a0487945c09760a5968d9333383014ea294117, 520e8b4bcf872a534a7bf61ccf880047642df296, <26b2290baaf6da6add0f782a100766e686a33f4f, <=*, <6.6.142, 6.19.14, 4a7bab35fad5251c8cb738161152578cd83b6b9c, d110d7cdb045715c0b45b0dfd974525bb38f653d, 6.18.24, <6.12.92, <0a96d9a85cd2240481297156b9bb72e10b7a8036, e252db8ca2a01f82d472091f35d549b313278636, 2e4adfaec97ee053ad1bdfb5036845e66f7e0d8a, a85b46db143fda5869e7d8df8f258ccef5fa1719, <4361954f0e158af0530caa1e57f12b531be4658f

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().

Gravité et risque d'exploitation

CVE-2026-64164 obtient un score CVSS de 0.0/10, soit une gravité non évaluée. Selon le modèle EPSS, la probabilité qu'elle soit exploitée dans les 30 prochains jours est de 0.11 %, ce qui la place devant 1.4 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=7.0.*, <c32a7e0e3c73c1c0768556a56bd78de9f7b83780, <=6.12.*, 32372781d664a9b03c40343e96c29d0a6139f97d, 6.12.83, 0, 7.0, <6279992c9ba2774901c9d4dd4a481162e2534714, 6.12.92, <c73370c677646e86fc4b1780fb07027bdf847375, <6.18.34, 6.6.142, <=6.6.*, c09a7446aab5773f38d6abb25fce99b8e1dfbc97, 6.6.136, <d78b0a80eac36879ef5478707135c446920e134b, <7.0, <6.20, 6.18.34, 7.1, <=6.18.*, 7.0.11, <12a0487945c09760a5968d9333383014ea294117, 520e8b4bcf872a534a7bf61ccf880047642df296, <26b2290baaf6da6add0f782a100766e686a33f4f, <=*, <6.6.142, 6.19.14, 4a7bab35fad5251c8cb738161152578cd83b6b9c, d110d7cdb045715c0b45b0dfd974525bb38f653d, 6.18.24, <6.12.92, <0a96d9a85cd2240481297156b9bb72e10b7a8036, e252db8ca2a01f82d472091f35d549b313278636, 2e4adfaec97ee053ad1bdfb5036845e66f7e0d8a, a85b46db143fda5869e7d8df8f258ccef5fa1719, <4361954f0e158af0530caa1e57f12b531be4658f) est présent sur votre parc.
  • Appliquez le correctif ou la version corrigée indiqués dans les références de l'éditeur.
  • À défaut de correctif, limitez l'exposition (filtrage réseau, désactivation du composant).
  • Automatisez la détection : les agents CVE Heimdall (gratuits, open source) corrèlent l'inventaire de vos serveurs avec la base CVE.

Références

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