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CVE-2023-54211

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : 6.1.43, <=6.1.*, 5.10.190, 0, <b4f4ab423107dc1ba8e9cc6488c645be6403d3f5, 6.5, <813cede7b2f5a4b1b75d2d4bb4e705cc8e063b20, <=4.14.*, 4.14.322, <=5.10.*, <528c9d73153754defb748f0b96ad33308668d817, <dea499781a1150d285c62b26659f62fb00824fce, <a3a3c7bddab9b6c5690b20796ef5e332b8c48afb, <a6d2fd1703cdc8ecfc3e73987e0fb7474ae2b074, 5.15.124, <=5.4.*, 4.7, <=4.19.*, 5.4.253, 6.4.8, <1488d782c9e43087a3f341b8186cd25f3cf75583, <=*, <=5.15.*, <4.7, 4.19.291, 0fc1b09ff1ff404ddf753f5ffa5cd0adc8fdcdc9, <cdcc35e6454133feb61561b4e0d0c80e52cbc2ba, <=6.4.*

Description

In the Linux kernel, the following vulnerability has been resolved: tracing: Fix warning in trace_buffered_event_disable() Warning happened in trace_buffered_event_disable() at WARN_ON_ONCE(!trace_buffered_event_ref) Call Trace: ? __warn+0xa5/0x1b0 ? trace_buffered_event_disable+0x189/0x1b0 __ftrace_event_enable_disable+0x19e/0x3e0 free_probe_data+0x3b/0xa0 unregister_ftrace_function_probe_func+0x6b8/0x800 event_enable_func+0x2f0/0x3d0 ftrace_process_regex.isra.0+0x12d/0x1b0 ftrace_filter_write+0xe6/0x140 vfs_write+0x1c9/0x6f0 [...] The cause of the warning is in __ftrace_event_enable_disable(), trace_buffered_event_enable() was called once while trace_buffered_event_disable() was called twice. Reproduction script show as below, for analysis, see the comments: ``` #!/bin/bash cd /sys/kernel/tracing/ # 1. Register a 'disable_event' command, then: # 1) SOFT_DISABLED_BIT was set; # 2) trace_buffered_event_enable() was called first time; echo 'cmdline_proc_show:disable_event:initcall:initcall_finish' > \ set_ftrace_filter # 2. Enable the event registered, then: # 1) SOFT_DISABLED_BIT was cleared; # 2) trace_buffered_event_disable() was called first time; echo 1 > events/initcall/initcall_finish/enable # 3. Try to call into cmdline_proc_show(), then SOFT_DISABLED_BIT was # set again!!! cat /proc/cmdline # 4. Unregister the 'disable_event' command, then: # 1) SOFT_DISABLED_BIT was cleared again; # 2) trace_buffered_event_disable() was called second time!!! echo '!cmdline_proc_show:disable_event:initcall:initcall_finish' > \ set_ftrace_filter ``` To fix it, IIUC, we can change to call trace_buffered_event_enable() at fist time soft-mode enabled, and call trace_buffered_event_disable() at last time soft-mode disabled.

Gravité et risque d'exploitation

CVE-2023-54211 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 0.21 %, ce qui la place devant 10.8 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions 6.1.43, <=6.1.*, 5.10.190, 0, <b4f4ab423107dc1ba8e9cc6488c645be6403d3f5, 6.5, <813cede7b2f5a4b1b75d2d4bb4e705cc8e063b20, <=4.14.*, 4.14.322, <=5.10.*, <528c9d73153754defb748f0b96ad33308668d817, <dea499781a1150d285c62b26659f62fb00824fce, <a3a3c7bddab9b6c5690b20796ef5e332b8c48afb, <a6d2fd1703cdc8ecfc3e73987e0fb7474ae2b074, 5.15.124, <=5.4.*, 4.7, <=4.19.*, 5.4.253, 6.4.8, <1488d782c9e43087a3f341b8186cd25f3cf75583, <=*, <=5.15.*, <4.7, 4.19.291, 0fc1b09ff1ff404ddf753f5ffa5cd0adc8fdcdc9, <cdcc35e6454133feb61561b4e0d0c80e52cbc2ba, <=6.4.*) 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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