{"apiVersion":"1.0","identifier":"CVE-2026-72125","description":"In the Linux kernel, the following vulnerability has been resolved: can: isotp: fix use-after-free race with concurrent NETDEV_UNREGISTER isotp_release() looked up the bound network device via dev_get_by_index() using the stored ifindex. During device unregistration the device is unlisted from the ifindex hash before the NETDEV_UNREGISTER notifier chain runs, so a concurrent isotp_release() could find no device, skip can_rx_unregister() entirely, and still proceed to free the socket. Since isotp_release() had already removed itself from the isotp notifier list at that point, isotp_notify() would never get a chance to clean up either, leaving a stale CAN filter that keeps pointing at the freed socket. Fix this the same way raw.c already does: hold a tracked reference to the bound net_device in the socket (so->dev/so->dev_tracker) from bind() onward instead of re-resolving it from the ifindex, and serialize bind()/release() with rtnl_lock() so that so->dev is always consistent with what the NETDEV_UNREGISTER notifier sees. so->dev stays valid regardless of ifindex-hash unlisting, and is only ever cleared by whichever of isotp_release()/isotp_notify() gets there first, so the filter is always removed exactly once. isotp_bind() now rejects a (re)bind with -EAGAIN while so->[tx|rx].state isn-t ISOTP_IDLE yet, so a timer left running by a prior NETDEV_UNREGISTER can-t act on a newly bound so->ifindex. Both checks share the same lock_sock() section, so there is no window in which a concurrent isotp_notify() clearing so->bound could be missed.","publishedAt":"2026-08-15T06:21:29","lastModifiedAt":"2026-08-19T17:21:00","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-72125","cvssScore":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.0016,"riskScore":0.79,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-72125","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-72125","en":"https://www.redsauce.net/en/cves/CVE-2026-72125","fr":"https://www.redsauce.net/fr/cves/CVE-2026-72125","pt":"https://www.redsauce.net/pt/cves/CVE-2026-72125","de":"https://www.redsauce.net/de/cves/CVE-2026-72125","sk":"https://www.redsauce.net/sk/cves/CVE-2026-72125","el":"https://www.redsauce.net/el/cves/CVE-2026-72125"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-72125"}}