{"id":"CVE-2026-72117","title":"can: bcm: fix data race on rx_stamp/rx_ifindex in bcm_rx_handler()","summary":"In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: fix data race on rx_stamp/rx_ifindex in bcm_rx_handler()\n\nFor an rx op subscribed on all interfaces (ifindex == 0), the same op\nis registered once in the shar…","severity":"none","vendor":"Linux","product":"Linux","affected":["Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < b64f60c468d149aca22ea56bb842b9730215aaa5","Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < c8a5d7cb095d3b12bd9dcf752d6ca0ff50872ac5","Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 4b97410f4bba18d2ee2784c8e089104f387bc27c","Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 5f246b96ab47523ec9b8ea870b5c567a3cb1eb1c","Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 656ff69ef235699035e57d9e1ae417e62a38aa7f","Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 136de17f38630307991c59aa7080012a99451783","Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < c312b750bb5ac3348cfc85dab25e90937bd4d251","Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 58fd6cbc8541216af1d7ed272ea7ac2b66d50fd8","Linux 2.6.25"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"partial","timestamp":"2026-11-06T16:51:45.682684Z"},"published":"2026-08-15","updated":"2026-11-06","sourceUpdated":"2026-11-06T16:55:20.494Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72117","references":[{"url":"https://git.kernel.org/stable/c/b64f60c468d149aca22ea56bb842b9730215aaa5"},{"url":"https://git.kernel.org/stable/c/c8a5d7cb095d3b12bd9dcf752d6ca0ff50872ac5"},{"url":"https://git.kernel.org/stable/c/4b97410f4bba18d2ee2784c8e089104f387bc27c"},{"url":"https://git.kernel.org/stable/c/5f246b96ab47523ec9b8ea870b5c567a3cb1eb1c"},{"url":"https://git.kernel.org/stable/c/656ff69ef235699035e57d9e1ae417e62a38aa7f"},{"url":"https://git.kernel.org/stable/c/136de17f38630307991c59aa7080012a99451783"},{"url":"https://git.kernel.org/stable/c/c312b750bb5ac3348cfc85dab25e90937bd4d251"},{"url":"https://git.kernel.org/stable/c/58fd6cbc8541216af1d7ed272ea7ac2b66d50fd8"}],"tags":["cve.org"],"epss":0.00216,"epssPercentile":0.12147,"ingestedAt":"2026-11-06T18:00:12.595Z","slug":"CVE-2026-72117","body":"## Overview\n\nIn the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: fix data race on rx_stamp/rx_ifindex in bcm_rx_handler()\n\nFor an rx op subscribed on all interfaces (ifindex == 0), the same op\nis registered once in the shared per-netns wildcard filter list, so\nbcm_rx_handler() can run concurrently on different CPUs for frames\narriving on different net devices.\n\nop->rx_stamp and op->rx_ifindex were written before bcm_rx_update_lock was\ntaken, allowing concurrent writers to race each other - including a torn\nstore of the 64-bit rx_stamp on 32-bit platforms.\n\nBeyond a torn store bcm_send_to_user() must report the timestamp/ifindex\nof the very same frame whose content it is delivering. 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.\n\n## Affected\n\n- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < b64f60c468d149aca22ea56bb842b9730215aaa5`\n- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < c8a5d7cb095d3b12bd9dcf752d6ca0ff50872ac5`\n- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 4b97410f4bba18d2ee2784c8e089104f387bc27c`\n- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 5f246b96ab47523ec9b8ea870b5c567a3cb1eb1c`\n- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 656ff69ef235699035e57d9e1ae417e62a38aa7f`\n- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 136de17f38630307991c59aa7080012a99451783`\n- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < c312b750bb5ac3348cfc85dab25e90937bd4d251`\n- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 58fd6cbc8541216af1d7ed272ea7ac2b66d50fd8`\n- `Linux 2.6.25`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"sunlit","depthScore":3,"depthScoreParts":{"impact":2.8,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}