{"id":"CVE-2026-72116","summary":"can: bcm: fix stale rx/tx ops after device removal","details":"In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: fix stale rx/tx ops after device removal\n\nRX: an RX_SETUP update(!) for an existing op skipped can_rx_register()\nunconditionally, even when a concurrent NETDEV_UNREGISTER had already\ntorn down its registration (op-\u003erx_reg_dev == NULL). This silently\ndid not re-enable frame delivery for that updated filter. bcm_rx_setup()\nnow re-registers in that case, while leaving rx_ops with ifindex = 0\n(all CAN devices) which never carry a tracked rx_reg_dev registered as-is.\n\nTX: bcm_notify() only handled bo-\u003erx_ops on NETDEV_UNREGISTER, leaving\ntx_ops with an active cyclic transmission re-arming its hrtimer\nindefinitely to execute bcm_tx_timeout_handler(). Cancelling the hrtimer\nprevents the runaway timer and any injection into a later reused ifindex,\nsince nothing else calls bcm_can_tx() for the op until an explicit\nTX_SETUP update re-arms it.\n\nUnlike bcm_rx_unreg(), which clears the tracked rx_reg_dev for rx_ops,\nthe ifindex is intentionally left unchanged for tx_ops. bcm_tx_setup()\nalways rejects ifindex 0, so clearing it would strand the op: neither a\nlater TX_SETUP (bcm_find_op()) nor TX_DELETE (bcm_delete_tx_op()) could\never find it again, since both require an exact ifindex match.","modified":"2026-08-21T03:30:21.273582481Z","published":"2026-08-15T05:52:56.260Z","database_specific":{"cna_assigner":"Linux","osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72116.json"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/3b762c0d950383ab7a002686c9136b9aa55d2d70"},{"type":"WEB","url":"https://git.kernel.org/stable/c/60d8a7942f4ed2d975207aaeba1adb576707e53d"},{"type":"WEB","url":"https://git.kernel.org/stable/c/6be3e1fedf03eab36a2c09d755d1171287b2014b"},{"type":"WEB","url":"https://git.kernel.org/stable/c/9517d8fb0b191398d35b9b7f8c719c1cc7761cb1"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b31d0933509c5a35c0be5736a2ce8df0d1bf112c"},{"type":"WEB","url":"https://git.kernel.org/stable/c/ca829677ffa2de5d79e06366e19ac1e4f5cc78dd"},{"type":"WEB","url":"https://git.kernel.org/stable/c/d30a36066ed3abefb72ae18901f71841ba18b350"},{"type":"WEB","url":"https://git.kernel.org/stable/c/f749e4564952d60e96930c09f2be99955d07c22e"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/72xxx/CVE-2026-72116.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72116"},{"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":"d30a36066ed3abefb72ae18901f71841ba18b350"},{"fixed":"ca829677ffa2de5d79e06366e19ac1e4f5cc78dd"},{"fixed":"9517d8fb0b191398d35b9b7f8c719c1cc7761cb1"},{"fixed":"60d8a7942f4ed2d975207aaeba1adb576707e53d"},{"fixed":"f749e4564952d60e96930c09f2be99955d07c22e"},{"fixed":"6be3e1fedf03eab36a2c09d755d1171287b2014b"},{"fixed":"b31d0933509c5a35c0be5736a2ce8df0d1bf112c"},{"fixed":"3b762c0d950383ab7a002686c9136b9aa55d2d70"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-72116.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-2026-72116.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H"}]}