can: bcm: add missing device refcount for CAN filter removal

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-72113
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: add missing device refcount for CAN filter removal sashiko-bot remarked a problem with a concurrent device unregistration in isotp.c which also is present in the bcm.c code. A former fix for raw.c commit c275a176e4b6 ("can: raw: add missing refcount for memory leak fix") introduced a netdevice_tracker which solves the issue for bcm.c too. bcm_release(), bcm_delete_rx_op() and bcm_notifier() relied on dev_get_by_index(ifindex) to re-find the device for an rx_op before unregistering its filter. If a concurrent NETDEV_UNREGISTER has already unlisted the device from the ifindex table, that lookup fails and can_rx_unregister() is silently skipped, leaving a stale CAN filter pointing at the soon-to-be-freed bcm_op/socket. Hold a netdev_hold()/netdev_put() tracked reference on op->rx_reg_dev from the moment the rx filter is registered in bcm_rx_setup() until it is unregistered in bcm_rx_unreg(), and use that reference directly in bcm_release() and bcm_delete_rx_op() instead of re-looking the device up by ifindex.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001630000 probability, percentile 0.060390000 (date 2026-08-19)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

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

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 bd5232663524e94cc5aad861dca11e3db8e2ab6f git Not specified
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 ee8b36d0faca08f35b889b6e9aa850695e5b8ba9 git Not specified
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 dcaee869913c7210cd47ed0a8f27349d7bdcdb7b git Not specified
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 84aa4807816e405c1bf87114fc63e06d244281ef git Not specified
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 633bda66fbf309f5de5e1ad6defe8e6b1d77a20f git Not specified
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 b024c21c9066f6957b7d4a8f2037e4b000c5e041 git Not specified
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 04d23061bbf18d5d81022eb21e9d32e99d24468d git Not specified
CNA Linux Linux affected ffd980f976e7fd666c2e61bf8ab35107efd11828 d59948293ea34b6337ce2b5febab8510de70048c 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/84aa4807816e405c1bf87114fc63e06d244281ef 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/04d23061bbf18d5d81022eb21e9d32e99d24468d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/633bda66fbf309f5de5e1ad6defe8e6b1d77a20f 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d59948293ea34b6337ce2b5febab8510de70048c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/bd5232663524e94cc5aad861dca11e3db8e2ab6f https://git.kernel.org/stable/c/bd5232663524e94cc5aad861dca11e3db8e2ab6f git.kernel.org
git.kernel.org/stable/c/dcaee869913c7210cd47ed0a8f27349d7bdcdb7b https://git.kernel.org/stable/c/dcaee869913c7210cd47ed0a8f27349d7bdcdb7b git.kernel.org
git.kernel.org/stable/c/ee8b36d0faca08f35b889b6e9aa850695e5b8ba9 https://git.kernel.org/stable/c/ee8b36d0faca08f35b889b6e9aa850695e5b8ba9 git.kernel.org
git.kernel.org/stable/c/b024c21c9066f6957b7d4a8f2037e4b000c5e041 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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