can: bcm: fix CAN frame rx/tx statistics

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Summary

CVECVE-2026-72118
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:21:26 UTC
Updated2026-08-17 06:18:11 UTC
DescriptionIn 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.

Risk And Classification

EPSS: 0.002000000 probability, percentile 0.101980000 (date 2026-08-17)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 8b2783172d92edd650de6006ebd1c800937021ab git Not specified
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 970caff5c1a63702c80e08d920256bcb5f88ecc5 git Not specified
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 8104bcdb2612fdda95169ddc3b49747b2ff98d24 git Not specified
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 df47f07cdc801a6afe05a486b5a343c3e532a93c git Not specified
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 e6c24ba95fc3f1b5e1dcd28b1c6e59ef61a9daa5 git Not specified
CNA Linux Linux affected 2.6.25 Not specified
CNA Linux Linux unaffected 2.6.25 semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.5 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/8104bcdb2612fdda95169ddc3b49747b2ff98d24 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/970caff5c1a63702c80e08d920256bcb5f88ecc5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8b2783172d92edd650de6006ebd1c800937021ab 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/e6c24ba95fc3f1b5e1dcd28b1c6e59ef61a9daa5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/df47f07cdc801a6afe05a486b5a343c3e532a93c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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