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CVE-2026-72121: Linux

8.8

CVSS 3.1

Няма данни

Вероятност да бъде експлоатирана в следващите 30 дни (EPSS)

Няма потвърждение

Атакува се

Няма данни

Време до експлоатация

Атакува се от съседна мрежа, без особени условия, без вход и без действие от потребителя.

  • Експлоатация: няма данни за експлоатация
  • Атаката не може да се автоматизира

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: can: bcm: add locking when updating filter and timer values KCSAN detected a simultaneous access to timer values that can be overwritten in bcm_rx_setup() when updating timer and filter content while bcm_rx_handler(), bcm_rx_timeout_handler() or bcm_rx_thr_handler() run concurrently on incoming CAN traffic. Protect the timer (ival1/ival2/kt_ival1/kt_ival2/kt_lastmsg) and filter (nframes/flags/frames/last_frames) updates in bcm_rx_setup() with a new per-op bcm_rx_update_lock, taken with the matching scope in the RX handlers. memcpy_from_msg() is staged into a temporary buffer before the lock is taken, since it can sleep and must not run under a spinlock. hrtimer_cancel() is always called without bcm_rx_update_lock held, since bcm_rx_timeout_handler()/bcm_rx_thr_handler() take the same lock and a running callback would otherwise deadlock against the canceller. Also close a related race: bcm_rx_setup() cleared the RTR flag in the stored reply frame's can_id as a separate, unprotected step after the frame content was already installed, so a concurrent bcm_rx_handler() could transmit a stale reply with CAN_RTR_FLAG still set. Fold that normalization into the initial frame preparation instead (on the staged buffer for updates, directly on op->frames pre-registration for new ops), so the installed frame is always atomically self-consistent. bcm_rx_handler()'s RX_RTR_FRAME check now takes a lock-protected snapshot of op->flags before deciding whether to call bcm_can_tx(), but does not hold the lock across that call. Also take a lock-protected snapshot of the currframe in bcm_can_tx() to avoid partly overwrites by content updates in bcm_tx_setup(). Finally check if a TX_RESET_MULTI_IDX/SETTIMER might have reset op->currframe between the two locked sections in bcm_can_tx(). Omit calling hrtimer_forward() with zero interval in bcm_rx_thr_handler(). kt_ival2 may have been concurrently cleared by bcm_rx_

Засегнати продукти

  • Linux Linux: 7595de7bc56e0e52b74e56c90f7e247bf626d628 преди 96994180bd7b248b0cc698afe926e23fc1bda59b; fbd8fdc2b218e979cfe422b139b8f74c12419d1f преди caa8704a7f3cb7806331596195385437126ecb3a; 2a437b86ac5a9893c902f30ef66815bf13587bf6 преди a7c369e7da8203e2b5be12bbcac7b9ab2ed5b658; 76c84c3728178b2d38d5604e399dfe8b0752645e преди a7eb6db1cd3f7b556a301dc1265945ad112089f7; cc55dd28c20a6611e30596019b3b2f636819a4c0 преди 834cbca3b12e46887f7a9b35f1981a888360ea4c; c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7 преди 19b1994069dd29478ba767de1f98f14a088198dc; c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7 преди fc9f5ee1b073bd233d9c604e338af4ebb42cbc33; c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7 преди 749179c2e25b95d22499ed29096b3e02d6dfd2b4; 8f1c022541bf5a923c8d6fa483112c15250f30a4; c4e8a172501e677ebd8ea9d9161d97dc4df56fbd; 5.10.238 преди 5.10.265; 5.15.185 преди 5.15.216; 6.1.141 преди 6.1.183; 6.6.93 преди 6.6.148; 6.12.31 преди 6.12.101; 5.4.294 преди 5.5; 6.14.9 преди 6.15
  • Linux Linux: 6.15; преди 6.15; 5.10.265 до 5.10.*; 5.15.216 до 5.15.*; 6.1.183 до 6.1.*; 6.6.148 до 6.6.*; 6.12.101 до 6.12.*; 6.18.42 до 6.18.*; 7.1.5 до 7.1.*; 7.2 до *

История

  • 15 август 2026 Публикувано

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CVE-2026-72121: Linux | freedomonline.bg