{"apiVersion":"1.0","identifier":"CVE-2026-72124","description":"In the Linux kernel, the following vulnerability has been resolved: can: isotp: serialize TX state transitions under so->rx_lock The TX state machine (so->tx.state) is driven from three contexts: sendmsg() claiming and progressing a transfer, the RX path consuming Flow Control/echo frames, and two hrtimers timing out a stalled transfer. Mixing a lock-free cmpxchg() claim in sendmsg() with hrtimer_cancel() calls made under so->rx_lock elsewhere left windows where a frame or timer callback could act on a state that had already moved on, corrupting an unrelated transfer. so->rx_lock now covers the full lifecycle of a TX claim: sendmsg() takes it to check so->tx.state is ISOTP_IDLE, switch it to ISOTP_SENDING, bump so->tx_gen and drain the previous transfer-s timers - all as one critical section. isotp_rcv_fc()/isotp_rcv_cf() already run under this lock via isotp_rcv(), and isotp_rcv_echo() now takes it itself, so none of them can ever observe a transfer mid-claim. This also means a transfer can no longer be handed to sendmsg()-s cleanup paths (signal or send error) while another thread is concurrently claiming or finishing it, so those paths can cancel timers and reset the state unconditionally. isotp_release() claims the socket the same way, so a racing sendmsg() sees a consistent ISOTP_SHUTDOWN and skips arming its timer or sending. Only the hrtimer callbacks stay outside so->rx_lock, since they run under so->rx_lock-s cancellation elsewhere and taking it themselves would deadlock. so->tx_gen lets them recognize whether the transfer they timed out is still the one currently active, so they don-t report an error against a transfer that has since completed or been superseded.","publishedAt":"2026-08-15T06:21:29","lastModifiedAt":"2026-08-19T17:20:59","sourceUrl":"https://nvd.nist.gov/vuln/detail/CVE-2026-72124","cvssScore":8.8,"cvssVector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","epssProbability":0.00345,"riskScore":0.91,"affectedProduct":"Linux kernel","affectedVersions":"unknown","vulnerabilityType":"Kernel","operatingSystems":[],"links":{"self":"https://www.redsauce.net/api/cves/CVE-2026-72124","webPages":{"es":"https://www.redsauce.net/es/cves/CVE-2026-72124","en":"https://www.redsauce.net/en/cves/CVE-2026-72124","fr":"https://www.redsauce.net/fr/cves/CVE-2026-72124","pt":"https://www.redsauce.net/pt/cves/CVE-2026-72124","de":"https://www.redsauce.net/de/cves/CVE-2026-72124","sk":"https://www.redsauce.net/sk/cves/CVE-2026-72124","el":"https://www.redsauce.net/el/cves/CVE-2026-72124"},"source":"https://nvd.nist.gov/vuln/detail/CVE-2026-72124"}}