can: bcm: track a single source interface for ANYDEV timeout/throttle ops

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72115
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-15 06:21:25 UTC
Updated2026-08-17 06:18:10 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: can: bcm: track a single source interface for ANYDEV timeout/throttle ops An ANYDEV rx op (ifindex == 0) with an active RX timeout and/or throttle timer has no defined semantics when matching frames arrive from several interfaces: bcm_rx_handler() can run concurrently for the same op on different CPUs, racing hrtimer_cancel()/ bcm_rx_starttimer() against bcm_rx_timeout_handler() and causing spurious RX_TIMEOUT notifications and last_frames corruption. The same concurrency lets throttled multiplex frames from different interfaces clobber the single rx_ifindex/rx_stamp fields shared by the op. Add op->if_detected to track the first interface that delivers a matching frame while a timeout/throttle timer is configured, and reject frames from any other interface for that op. The claim is decided in bcm_rx_handler() before hrtimer_cancel() touches op->timer, so a rejected frame can never disturb the claimed interface's watchdog. RTR-mode ops are excluded via RX_RTR_FRAME, independent of kt_ival1/kt_ival2, since those may briefly hold a stale value from an earlier non-RTR configuration. The claim is released in bcm_notify() on NETDEV_UNREGISTER and in bcm_rx_setup() when SETTIMER reconfigures the timer values. A (re-)claim is only possible on CAN devices in NETREG_REGISTERED dev->reg_state to cover the release in bcm_notify() where reg_state becomes NETREG_UNREGISTERING until synchronize_net().

Risk And Classification

Primary CVSS: v3.1 8.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

EPSS: 0.002810000 probability, percentile 0.206750000 (date 2026-08-19)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary8.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
3.1CNADECLARED8.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
None

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 f147f48837cb1426521f5b3c3b3134c71128a25d git Not specified
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 57cf104da4cf450ae9c16801a3164604b801d2cc git Not specified
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 03dfe347c398fa41a7e30e8dc538f12568c183e6 git Not specified
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 18b45251e74e35668f0dd0c470549384ae191ecf git Not specified
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 3ff8c24b421070a2db99a5cdb86edc9ff339418e git Not specified
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 eca8b44d51fc6ab61022258ec968e55e3073b79e git Not specified
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 b6317022b685a430a3ae420456716e3c0c02ef4b git Not specified
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 2f5976f54a04e9f18b25283036ac3136be453b17 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 5.10.265 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.216 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.183 6.1.* 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/18b45251e74e35668f0dd0c470549384ae191ecf 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/b6317022b685a430a3ae420456716e3c0c02ef4b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/57cf104da4cf450ae9c16801a3164604b801d2cc https://git.kernel.org/stable/c/57cf104da4cf450ae9c16801a3164604b801d2cc git.kernel.org
git.kernel.org/stable/c/03dfe347c398fa41a7e30e8dc538f12568c183e6 https://git.kernel.org/stable/c/03dfe347c398fa41a7e30e8dc538f12568c183e6 git.kernel.org
git.kernel.org/stable/c/2f5976f54a04e9f18b25283036ac3136be453b17 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f147f48837cb1426521f5b3c3b3134c71128a25d https://git.kernel.org/stable/c/f147f48837cb1426521f5b3c3b3134c71128a25d git.kernel.org
git.kernel.org/stable/c/3ff8c24b421070a2db99a5cdb86edc9ff339418e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eca8b44d51fc6ab61022258ec968e55e3073b79e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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