CVE-2026-72117

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.

CVSS

No CVSS.

References

Link	Resource
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

Configurations

No configuration.

History

No history.

Information

Published : 2026-08-15 06:21

Updated : 2026-08-19 17:20

NVD link : CVE-2026-72117

Mitre link : CVE-2026-72117

CVE.ORG link : CVE-2026-72117

JSON object : View

Products Affected

No product.

CWE

No CWE.

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So the assignment\nis placed in the same unbroken bcm_rx_update_lock section as the content\ncomparison.\n\nAs a side effect, the RTR-request frame feature (which never reach\nbcm_send_to_user()) no longer updates rx_stamp/rx_ifindex, since only\nthe notification path needs them."}], "lastModified": "2026-08-19T17:20:58.287", "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}