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CVE-2023-53728

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, <ef535e0315afd098c4beb1da364847eca4b56a20, 5ed67f05f66c41e39880a6d61358438a25f9fee5, 5.4.251, 0, <37175e25edf7cc0d5a2cd2c2a1cbe2dcbf4a1937, 6.5, <3.10, <=5.10.*, <=4.14.*, 4.14.322, <9ea26a8494a0a9337e7415eafd6f3ed940327dc5, <8ad6679a5bb97cdb3e14942729292b4bfcc0e223, <6a0ac84501b4fec73a1a823c55cf13584c43f418, <=5.4.*, 6.1.107, <=4.19.*, <8ce8849dd1e78dadcee0ec9acbd259d239b7069f, <=*, <=5.15.*, 3.10, 4.19.291, 5.10.188, <8dc52c200b889bc1cb34288fbf623d4ff381d2ae, <322377cc909defcca9451487484845e7e1d20d1b, 5.15.150, 6.4.7, <=6.4.*

Description

In the Linux kernel, the following vulnerability has been resolved: posix-timers: Ensure timer ID search-loop limit is valid posix_timer_add() tries to allocate a posix timer ID by starting from the cached ID which was stored by the last successful allocation. This is done in a loop searching the ID space for a free slot one by one. The loop has to terminate when the search wrapped around to the starting point. But that's racy vs. establishing the starting point. That is read out lockless, which leads to the following problem: CPU0 CPU1 posix_timer_add() start = sig->posix_timer_id; lock(hash_lock); ... posix_timer_add() if (++sig->posix_timer_id < 0) start = sig->posix_timer_id; sig->posix_timer_id = 0; So CPU1 can observe a negative start value, i.e. -1, and the loop break never happens because the condition can never be true: if (sig->posix_timer_id == start) break; While this is unlikely to ever turn into an endless loop as the ID space is huge (INT_MAX), the racy read of the start value caught the attention of KCSAN and Dmitry unearthed that incorrectness. Rewrite it so that all id operations are under the hash lock.

Gravité et risque d'exploitation

CVE-2023-53728 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 10.5 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, <ef535e0315afd098c4beb1da364847eca4b56a20, 5ed67f05f66c41e39880a6d61358438a25f9fee5, 5.4.251, 0, <37175e25edf7cc0d5a2cd2c2a1cbe2dcbf4a1937, 6.5, <3.10, <=5.10.*, <=4.14.*, 4.14.322, <9ea26a8494a0a9337e7415eafd6f3ed940327dc5, <8ad6679a5bb97cdb3e14942729292b4bfcc0e223, <6a0ac84501b4fec73a1a823c55cf13584c43f418, <=5.4.*, 6.1.107, <=4.19.*, <8ce8849dd1e78dadcee0ec9acbd259d239b7069f, <=*, <=5.15.*, 3.10, 4.19.291, 5.10.188, <8dc52c200b889bc1cb34288fbf623d4ff381d2ae, <322377cc909defcca9451487484845e7e1d20d1b, 5.15.150, 6.4.7, <=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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