Description
In the Linux kernel, the following vulnerability has been resolved:
can: bcm: fix data race on rx_stamp/rx_ifindex in bcm_rx_handler()
For an rx op subscribed on all interfaces (ifindex == 0), the same op is registered once in the shared per-netns wildcard filter list, so bcm_rx_handler() can run concurrently on different CPUs for frames arriving on different net devices.
op->rx_stamp and op->rx_ifindex were written before bcm_rx_update_lock was taken, allowing concurrent writers to race each other - including a torn store of the 64-bit rx_stamp on 32-bit platforms.
Beyond a torn store bcm_send_to_user() must report the timestamp/ifindex of the very same frame whose content it is delivering. So the assignment is placed in the same unbroken bcm_rx_update_lock section as the content comparison.
As a side effect, the RTR-request frame feature (which never reach bcm_send_to_user()) no longer updates rx_stamp/rx_ifindex, since only the notification path needs them.
Metrics
No CVSS score has been published yet.
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= ffd980f976e7fd666c2e61bf8ab35107efd11828, < b64f60c468d149aca22ea56bb842b9730215aaa5; >= ffd980f976e7fd666c2e61bf8ab35107efd11828, < c8a5d7cb095d3b12bd9dcf752d6ca0ff50872ac5; >= ffd980f976e7fd666c2e61bf8ab35107efd11828, < 4b97410f4bba18d2ee2784c8e089104f387bc27c; >= ffd980f976e7fd666c2e61bf8ab35107efd11828, < 5f246b96ab47523ec9b8ea870b5c567a3cb1eb1c; >= ffd980f976e7fd666c2e61bf8ab35107efd11828, < 656ff69ef235699035e57d9e1ae417e62a38aa7f; >= ffd980f976e7fd666c2e61bf8ab35107efd11828, < 136de17f38630307991c59aa7080012a99451783; >= ffd980f976e7fd666c2e61bf8ab35107efd11828, < c312b750bb5ac3348cfc85dab25e90937bd4d251; >= ffd980f976e7fd666c2e61bf8ab35107efd11828, < 58fd6cbc8541216af1d7ed272ea7ac2b66d50fd8 |
| Linux | Linux | 2.6.25 |
References
- https://git.kernel.org/stable/c/136de17f38630307991c59aa7080012a99451783
- https://git.kernel.org/stable/c/4b97410f4bba18d2ee2784c8e089104f387bc27c
- https://git.kernel.org/stable/c/58fd6cbc8541216af1d7ed272ea7ac2b66d50fd8
- https://git.kernel.org/stable/c/5f246b96ab47523ec9b8ea870b5c567a3cb1eb1c
- https://git.kernel.org/stable/c/656ff69ef235699035e57d9e1ae417e62a38aa7f
- https://git.kernel.org/stable/c/b64f60c468d149aca22ea56bb842b9730215aaa5
- https://git.kernel.org/stable/c/c312b750bb5ac3348cfc85dab25e90937bd4d251
- https://git.kernel.org/stable/c/c8a5d7cb095d3b12bd9dcf752d6ca0ff50872ac5
Timeline
- Published
- Aug 15, 2026
- Last modified
- Nov 6, 2026
- NVD status
- Received