Description
In the Linux kernel, the following vulnerability has been resolved: can: bcm: add locking for bcm_op runtime updates The CAN broadcast manager (CAN BCM) can send a sequence of CAN frames via hrtimer. The content and also the length of the sequence can be changed resp reduced at runtime where the 'currframe' counter is then set to zero. Although this appeared to be a safe operation the updates of 'currframe' can be triggered from user space and hrtimer context in bcm_can_tx(). Anderson Nascimento created a proof of concept that triggered a KASAN slab-out-of-bounds read access which can be prevented with a spin_lock_bh. At the rework of bcm_can_tx() the 'count' variable has been moved into the protected section as this variable can be modified from both contexts too.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
ffd980f976e7fd666c2e61bf8ab35107efd11828 to < 8f1c022541bf5a923c8d6fa483112c15250f30a4affectedffd980f976e7fd666c2e61bf8ab35107efd11828 to < 7595de7bc56e0e52b74e56c90f7e247bf626d628affectedffd980f976e7fd666c2e61bf8ab35107efd11828 to < fbd8fdc2b218e979cfe422b139b8f74c12419d1faffectedffd980f976e7fd666c2e61bf8ab35107efd11828 to < 2a437b86ac5a9893c902f30ef66815bf13587bf6affectedffd980f976e7fd666c2e61bf8ab35107efd11828 to < 76c84c3728178b2d38d5604e399dfe8b0752645eaffectedffd980f976e7fd666c2e61bf8ab35107efd11828 to < cc55dd28c20a6611e30596019b3b2f636819a4c0affectedffd980f976e7fd666c2e61bf8ab35107efd11828 to < c4e8a172501e677ebd8ea9d9161d97dc4df56fbdaffectedffd980f976e7fd666c2e61bf8ab35107efd11828 to < c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7affected
Linux Linux
Default version status: affected
2.6.25affected0 to < 2.6.25unaffected5.4.294 to ≤ 5.4.*unaffected5.10.238 to ≤ 5.10.*unaffected5.15.185 to ≤ 5.15.*unaffected6.1.141 to ≤ 6.1.*unaffected6.6.93 to ≤ 6.6.*unaffected6.12.31 to ≤ 6.12.*unaffected6.14.9 to ≤ 6.14.*unaffected6.15 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/8f1c022541bf5a923c8d6fa483112c15250f30a4 ↗
- https://git.kernel.org/stable/c/7595de7bc56e0e52b74e56c90f7e247bf626d628 ↗
- https://git.kernel.org/stable/c/fbd8fdc2b218e979cfe422b139b8f74c12419d1f ↗
- https://git.kernel.org/stable/c/2a437b86ac5a9893c902f30ef66815bf13587bf6 ↗
- https://git.kernel.org/stable/c/76c84c3728178b2d38d5604e399dfe8b0752645e ↗
- https://git.kernel.org/stable/c/cc55dd28c20a6611e30596019b3b2f636819a4c0 ↗
- https://git.kernel.org/stable/c/c4e8a172501e677ebd8ea9d9161d97dc4df56fbd ↗
- https://git.kernel.org/stable/c/c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7 ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00008.html ↗
- https://lists.debian.org/debian-lts-announce/2025/10/msg00007.html ↗