{"id":"CVE-2026-72125","revision":"256e127fbab64cc4bdbe6fa82579a3db","records":[{"revision":"256e127fbab64cc4bdbe6fa82579a3db","observedAt":"2026-10-23T15:48:27.903+00:00","statement":{"source":"cve-program","id":"CVE-2026-72125","aliases":[],"title":"can: isotp: fix use-after-free race with concurrent NETDEV_UNREGISTER","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncan: isotp: fix use-after-free race with concurrent NETDEV_UNREGISTER\n\nisotp_release() looked up the bound network device via dev_get_by_index()\nusing the stored ifindex. During device unregistration the device is\nunlisted from the ifindex hash before the NETDEV_UNREGISTER notifier\nchain runs, so a concurrent isotp_release() could find no device, skip\ncan_rx_unregister() entirely, and still proceed to free the socket.\nSince isotp_release() had already removed itself from the isotp\nnotifier list at that point, isotp_notify() would never get a chance to\nclean up either, leaving a stale CAN filter that keeps pointing at the\nfreed socket.\n\nFix this the same way raw.c already does: hold a tracked reference to\nthe bound net_device in the socket (so->dev/so->dev_tracker) from\nbind() onward instead of re-resolving it from the ifindex, and\nserialize bind()/release() with rtnl_lock() so that so->dev is always\nconsistent with what the NETDEV_UNREGISTER notifier sees. so->dev\nstays valid regardless of ifindex-hash unlisting, and is only ever\ncleared by whichever of isotp_release()/isotp_notify() gets there\nfirst, so the filter is always removed exactly once.\n\nisotp_bind() now rejects a (re)bind with -EAGAIN while so->[tx|rx].state\nisn't ISOTP_IDLE yet, so a timer left running by a prior\nNETDEV_UNREGISTER can't act on a newly bound so->ifindex. Both checks\nshare the same lock_sock() section, so there is no window in which a\nconcurrent isotp_notify() clearing so->bound could be missed.","state":0,"publishedAt":"2026-08-15T05:53:02.905+00:00","modifiedAt":"2026-10-16T18:44:57.938+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\": \"e057dd3fc20ffb3d7f150af46542a51b59b90127\",\n                            \"lessThan\": \"f311bbb29bb06aaab69ba45a6e4b11323d20b8f9\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e057dd3fc20ffb3d7f150af46542a51b59b90127\",\n                            \"lessThan\": \"8e018f4335590460ebcf0c2b493ed38ba1a35204\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e057dd3fc20ffb3d7f150af46542a51b59b90127\",\n                            \"lessThan\": \"33b9cd9245e2a4b800f99ed1cc53d64960614152\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e057dd3fc20ffb3d7f150af46542a51b59b90127\",\n                            \"lessThan\": \"0b811c4bbe3ec9ad611e90a540fe8b51b3bb8a96\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e057dd3fc20ffb3d7f150af46542a51b59b90127\",\n                            \"lessThan\": \"43884dc7963beef2328f507f4fe680bdc173eb80\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e057dd3fc20ffb3d7f150af46542a51b59b90127\",\n                            \"lessThan\": \"7bef39ba76eb7307ed22a50329e0f5776dbeda58\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e057dd3fc20ffb3d7f150af46542a51b59b90127\",\n                            \"lessThan\": \"e442b62ba5a7756c17e05a77b32cdd085a2b6138\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\n                        },\n                        {\n                            \"version\": \"e057dd3fc20ffb3d7f150af46542a51b59b90127\",\n                            \"lessThan\": \"20bab8b88baac140ca3701116e1d486c7f51e311\",\n                            \"status\": \"affected\",\n                            \"versionType\": \"git\"\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\": \"5.10\",\n                            \"status\": \"affected\"\n                        },\n                        {\n                            \"version\": \"0\",\n                            \"lessThan\": \"5.10\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.10.265\",\n                            \"lessThanOrEqual\": \"5.10.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"5.15.216\",\n                            \"lessThanOrEqual\": \"5.15.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.1.183\",\n                            \"lessThanOrEqual\": \"6.1.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.6.148\",\n                            \"lessThanOrEqual\": \"6.6.*\",\n                            \"status\": \"unaffected\",\n                            \"versionType\": \"semver\"\n                        },\n                        {\n                            \"version\": \"6.12.101\",\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/f311bbb29bb06aaab69ba45a6e4b11323d20b8f9","https://git.kernel.org/stable/c/8e018f4335590460ebcf0c2b493ed38ba1a35204","https://git.kernel.org/stable/c/33b9cd9245e2a4b800f99ed1cc53d64960614152","https://git.kernel.org/stable/c/0b811c4bbe3ec9ad611e90a540fe8b51b3bb8a96","https://git.kernel.org/stable/c/43884dc7963beef2328f507f4fe680bdc173eb80","https://git.kernel.org/stable/c/7bef39ba76eb7307ed22a50329e0f5776dbeda58","https://git.kernel.org/stable/c/e442b62ba5a7756c17e05a77b32cdd085a2b6138","https://git.kernel.org/stable/c/20bab8b88baac140ca3701116e1d486c7f51e311"],"sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72125","license":"CVE Program Terms of Use","key":"cve-program:CVE-2026-72125","identifiers":["CVE-2026-72125"]},"retained":false,"historicalAffected":[]}],"coverage":[]}