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CVE-2026-72118

Vulnérabilité non évaluée dans Linux (Linux)

CVSS 0.0 · Non évaluée
EPSS 0.2%
Linux•Linux•Versions : <=6.1.*, 7.1.5, <=6.12.*, <970caff5c1a63702c80e08d920256bcb5f88ecc5, 6.12.101, <8b2783172d92edd650de6006ebd1c800937021ab, 0, <=7.1.*, 5.15.216, <47fca0d1620f2d4fab0677564989ef2b9c225c66, <=5.10.*, <=6.6.*, 6.18.42, 6.1.183, <8104bcdb2612fdda95169ddc3b49747b2ff98d24, <fd75884eae40a7be47867cbfc9fc84a80bb8ddb4, <=6.18.*, ffd980f976e7fd666c2e61bf8ab35107efd11828, <e6c24ba95fc3f1b5e1dcd28b1c6e59ef61a9daa5, 2.6.25, <2.6.25, <df47f07cdc801a6afe05a486b5a343c3e532a93c, <640acf3566fc897065127001be875ebc5401c218, <=*, <=5.15.*, 5.10.265, 6.6.148, 7.2

Description

In the Linux kernel, the following vulnerability has been resolved: can: bcm: fix CAN frame rx/tx statistics KCSAN detected a data race within the bcm_rx_handler() when two CAN frames have been simultaneously received and processed in a single rx op by two different CPUs. Use atomic operations with (signed) long data types to access the statistics in the hot path to fix the KCSAN complaint. Additionally simplify the update and check of statistics overflow by using the atomic operations in separate bcm_update_[rx|tx]_stats() functions. The rx variant runs under bcm_rx_update_lock to prevent races when resetting the two rx counters; the tx variant runs under bcm_tx_lock and only needs to guard its own counter's overflow. As the rx path resets its values already at LONG_MAX / 100, there is no conflict between the two locking domains (bcm_rx_update_lock vs. bcm_tx_lock) even for ops that use both paths. The rx statistics update and the frames_filtered update in bcm_rx_changed() were previously performed in two separate bcm_rx_update_lock sections. For an rx op subscribed on all interfaces (ifindex == 0), bcm_rx_handler() can run concurrently on different CPUs, so a counter reset by one CPU between these two sections could leave frames_filtered larger than frames_abs on another CPU, producing a bogus (even negative) reduction percentage in procfs. Update the statistics in the same critical section as bcm_rx_changed() to close this gap, which also removes the now unneeded extra lock/unlock pair around the traffic_flags calculation.

Gravité et risque d'exploitation

CVE-2026-72118 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 0.22 %, ce qui la place devant 11.4 % des CVE référencées.

Que faire ?

  • Vérifiez si Linux (versions <=6.1.*, 7.1.5, <=6.12.*, <970caff5c1a63702c80e08d920256bcb5f88ecc5, 6.12.101, <8b2783172d92edd650de6006ebd1c800937021ab, 0, <=7.1.*, 5.15.216, <47fca0d1620f2d4fab0677564989ef2b9c225c66, <=5.10.*, <=6.6.*, 6.18.42, 6.1.183, <8104bcdb2612fdda95169ddc3b49747b2ff98d24, <fd75884eae40a7be47867cbfc9fc84a80bb8ddb4, <=6.18.*, ffd980f976e7fd666c2e61bf8ab35107efd11828, <e6c24ba95fc3f1b5e1dcd28b1c6e59ef61a9daa5, 2.6.25, <2.6.25, <df47f07cdc801a6afe05a486b5a343c3e532a93c, <640acf3566fc897065127001be875ebc5401c218, <=*, <=5.15.*, 5.10.265, 6.6.148, 7.2) 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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