{"id":"CVE-2026-72126","revision":null,"records":[{"revision":"fd42671e0c2d4d7c94de0e1b8ae803d6","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-72126","aliases":[],"title":"can: isotp: use unconditional synchronize_rcu() in isotp_release()","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncan: isotp: use unconditional synchronize_rcu() in isotp_release()\n\nisotp_notify() unregisters the (RCU) CAN filters via can_rx_unregister()\nand clears so->bound without waiting for a grace period. isotp_release()\nuses so->bound to decide whether it needs to call synchronize_rcu()\nbefore cancelling so->rxtimer, so when NETDEV_UNREGISTER runs first it\nskips that synchronize_rcu() and can cancel the timer while an\nin-flight isotp_rcv() is still executing and about to re-arm it via\nisotp_send_fc(), leading to a use-after-free timer callback on the\nfreed socket.\n\nsakisho-bot remarked a problem with rtnl_lock held in isotp_notify(),\ntherefore make isotp_release() always call synchronize_rcu() before\ncancelling the timers, regardless of so->bound. This still closes the\noriginal race (isotp_notify() clearing so->bound without waiting for\nin-flight isotp_rcv() callers before isotp_release() cancels the RX\ntimer) without adding any RCU wait to the netdevice notifier path.","state":0,"publishedAt":"2026-08-15T05:53:03.642+00:00","modifiedAt":"2026-10-16T18:44:58.135+00:00","affected":[{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"unaffected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/can/isotp.c\"\n ],\n \"versions\": [\n {\n \"version\": \"22bfa94db2ef6900c790884fa9461486516626e9\",\n \"lessThan\": \"945d9894502cd9124f5d676181c542ed2000f7c0\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"14a4696bc3118ba49da28f79280e1d55603aa737\",\n \"lessThan\": \"59672aa4bcd8d32172c1ff6a179583981d6acabc\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"14a4696bc3118ba49da28f79280e1d55603aa737\",\n \"lessThan\": \"15413a082df69175c2f96aeab4c26fe1ff7cff03\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"14a4696bc3118ba49da28f79280e1d55603aa737\",\n \"lessThan\": \"6280eda96e0707264849fa7d036fed873c1f8a6d\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"14a4696bc3118ba49da28f79280e1d55603aa737\",\n \"lessThan\": \"cb6abc584a1bfab107ac003d64948a4aef1730aa\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"14a4696bc3118ba49da28f79280e1d55603aa737\",\n \"lessThan\": \"b88a511308779c225005d7994b8744561bdbafbc\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"14a4696bc3118ba49da28f79280e1d55603aa737\",\n \"lessThan\": \"b8278ff605187ef3fa0f2705e93251cce4c4f8ee\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"14a4696bc3118ba49da28f79280e1d55603aa737\",\n \"lessThan\": \"9b1a02e0d980ac6b0e36a90378f847062f81d7e4\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"80c6ddf771df2ef786f28c1ca5919b3f1080091b\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"ebf91625b3e404bd2b4b694c7ee71c1e8f8bd08f\",\n \"status\": \"affected\",\n \"versionType\": \"git\"\n },\n {\n \"version\": \"5.10.50\",\n \"lessThan\": \"5.10.261\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.12.17\",\n \"lessThan\": \"5.13\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.13.2\",\n \"lessThan\": \"5.14\",\n \"status\": \"affected\",\n \"versionType\": \"semver\"\n }\n ]\n }"},{"ecosystem":"Vendor product","name":"Linux","ranges":[],"versions":[],"rawVersionEvidence":"{\n \"product\": \"Linux\",\n \"vendor\": \"Linux\",\n \"defaultStatus\": \"affected\",\n \"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\n \"programFiles\": [\n \"net/can/isotp.c\"\n ],\n \"versions\": [\n {\n \"version\": \"5.14\",\n \"status\": \"affected\"\n },\n {\n \"version\": \"0\",\n \"lessThan\": \"5.14\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.10.261\",\n \"lessThanOrEqual\": \"5.10.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"5.15.212\",\n \"lessThanOrEqual\": \"5.15.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.1.178\",\n \"lessThanOrEqual\": \"6.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.6.145\",\n \"lessThanOrEqual\": \"6.6.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.12.97\",\n \"lessThanOrEqual\": \"6.12.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"6.18.40\",\n \"lessThanOrEqual\": \"6.18.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.1.5\",\n \"lessThanOrEqual\": \"7.1.*\",\n \"status\": \"unaffected\",\n \"versionType\": \"semver\"\n },\n {\n \"version\": \"7.2\",\n \"lessThanOrEqual\": \"*\",\n \"status\": \"unaffected\",\n \"versionType\": \"original_commit_for_fix\"\n }\n ]\n }"}],"metrics":[{"system":"CVSS 3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","score":7.8,"severity":"HIGH"}],"references":["https://git.kernel.org/stable/c/945d9894502cd9124f5d676181c542ed2000f7c0","https://git.kernel.org/stable/c/59672aa4bcd8d32172c1ff6a179583981d6acabc","https://git.kernel.org/stable/c/15413a082df69175c2f96aeab4c26fe1ff7cff03","https://git.kernel.org/stable/c/6280eda96e0707264849fa7d036fed873c1f8a6d","https://git.kernel.org/stable/c/cb6abc584a1bfab107ac003d64948a4aef1730aa","https://git.kernel.org/stable/c/b88a511308779c225005d7994b8744561bdbafbc","https://git.kernel.org/stable/c/b8278ff605187ef3fa0f2705e93251cce4c4f8ee","https://git.kernel.org/stable/c/9b1a02e0d980ac6b0e36a90378f847062f81d7e4"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72126","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-72126","identifiers":["CVE-2026-72126"]},"retained":false,"historicalAffected":[]}],"coverage":[{"source":"cisa-kev:global","scope":"Complete CISA KEV catalog; all 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