CVE-2025-38004

can: bcm: add locking for bcm_op runtime updates

State: Published
Severity: 7.3 High
Published: Jun 8, 2025
Updated: Oct 15, 2026
Reserved: Apr 16, 2025

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.

Scores

CVSS	Score	Vector	Source
3.1	7.3 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:L/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 8f1c022541bf5a923c8d6fa483112c15250f30a4Affected ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 7595de7bc56e0e52b74e56c90f7e247bf626d628Affected ffd980f976e7fd666c2e61bf8ab35107efd11828 to before fbd8fdc2b218e979cfe422b139b8f74c12419d1fAffected ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 2a437b86ac5a9893c902f30ef66815bf13587bf6Affected ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 76c84c3728178b2d38d5604e399dfe8b0752645eAffected ffd980f976e7fd666c2e61bf8ab35107efd11828 to before cc55dd28c20a6611e30596019b3b2f636819a4c0Affected ffd980f976e7fd666c2e61bf8ab35107efd11828 to before c4e8a172501e677ebd8ea9d9161d97dc4df56fbdAffected ffd980f976e7fd666c2e61bf8ab35107efd11828 to before c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7Affected
LinuxLinux	2.6.25Affected before 2.6.25Not affected 5.4.294 through 5.4.Not affected 5.10.238 through 5.10.Not affected 5.15.185 through 5.15.Not affected 6.1.141 through 6.1.Not affected 6.6.93 through 6.6.Not affected 6.12.31 through 6.12.Not affected 6.14.9 through 6.14.*Not affected 6.15 and laterNot affected

Product

Versions

LinuxLinux

ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 8f1c022541bf5a923c8d6fa483112c15250f30a4Affected
ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 7595de7bc56e0e52b74e56c90f7e247bf626d628Affected
ffd980f976e7fd666c2e61bf8ab35107efd11828 to before fbd8fdc2b218e979cfe422b139b8f74c12419d1fAffected
ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 2a437b86ac5a9893c902f30ef66815bf13587bf6Affected
ffd980f976e7fd666c2e61bf8ab35107efd11828 to before 76c84c3728178b2d38d5604e399dfe8b0752645eAffected
ffd980f976e7fd666c2e61bf8ab35107efd11828 to before cc55dd28c20a6611e30596019b3b2f636819a4c0Affected
ffd980f976e7fd666c2e61bf8ab35107efd11828 to before c4e8a172501e677ebd8ea9d9161d97dc4df56fbdAffected
ffd980f976e7fd666c2e61bf8ab35107efd11828 to before c2aba69d0c36a496ab4f2e81e9c2b271f2693fd7Affected

LinuxLinux

2.6.25Affected
before 2.6.25Not affected
5.4.294 through 5.4.*Not affected
5.10.238 through 5.10.*Not affected
5.15.185 through 5.15.*Not affected
6.1.141 through 6.1.*Not affected
6.6.93 through 6.6.*Not affected
6.12.31 through 6.12.*Not affected
6.14.9 through 6.14.*Not affected
6.15 and laterNot affected

References

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