{"id":"CVE-2026-72117","summary":"can: bcm: fix data race on rx_stamp/rx_ifindex in bcm_rx_handler()","details":"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 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-\u003erx_stamp and op-\u003erx_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.","modified":"2026-08-21T03:30:24.617837103Z","published":"2026-08-15T05:52:56.991Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72117.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/136de17f38630307991c59aa7080012a99451783"},{"type":"WEB","url":"https://git.kernel.org/stable/c/4b97410f4bba18d2ee2784c8e089104f387bc27c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/58fd6cbc8541216af1d7ed272ea7ac2b66d50fd8"},{"type":"WEB","url":"https://git.kernel.org/stable/c/5f246b96ab47523ec9b8ea870b5c567a3cb1eb1c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/656ff69ef235699035e57d9e1ae417e62a38aa7f"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b64f60c468d149aca22ea56bb842b9730215aaa5"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c312b750bb5ac3348cfc85dab25e90937bd4d251"},{"type":"WEB","url":"https://git.kernel.org/stable/c/c8a5d7cb095d3b12bd9dcf752d6ca0ff50872ac5"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72117.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72117"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"ffd980f976e7fd666c2e61bf8ab35107efd11828"},{"fixed":"b64f60c468d149aca22ea56bb842b9730215aaa5"},{"fixed":"c8a5d7cb095d3b12bd9dcf752d6ca0ff50872ac5"},{"fixed":"4b97410f4bba18d2ee2784c8e089104f387bc27c"},{"fixed":"5f246b96ab47523ec9b8ea870b5c567a3cb1eb1c"},{"fixed":"656ff69ef235699035e57d9e1ae417e62a38aa7f"},{"fixed":"136de17f38630307991c59aa7080012a99451783"},{"fixed":"c312b750bb5ac3348cfc85dab25e90937bd4d251"},{"fixed":"58fd6cbc8541216af1d7ed272ea7ac2b66d50fd8"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72117.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"2.6.25"},{"fixed":"5.10.265"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.11.0"},{"fixed":"5.15.216"}]},{"type":"ECOSYSTEM","events":[{"introduced":"5.16.0"},{"fixed":"6.1.183"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.2.0"},{"fixed":"6.6.148"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.7.0"},{"fixed":"6.12.101"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.42"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.1.5"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72117.json"}}],"schema_version":"1.9.0"}