CVE-2026-72126High· 7.8▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: can: isotp: use unconditional synchronize_rcu() in isotp_release() isotp_notify() unregisters the (RCU) CAN filters via can_rx_unregister() and clears so->bound withou…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 42.9 · likelihood 0 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.2%
In the Linux kernel, the following vulnerability has been resolved:
can: isotp: use unconditional synchronize_rcu() in isotp_release()
isotp_notify() unregisters the (RCU) CAN filters via can_rx_unregister() and clears so->bound without waiting for a grace period. isotp_release() uses so->bound to decide whether it needs to call synchronize_rcu() before cancelling so->rxtimer, so when NETDEV_UNREGISTER runs first it skips that synchronize_rcu() and can cancel the timer while an in-flight isotp_rcv() is still executing and about to re-arm it via isotp_send_fc(), leading to a use-after-free timer callback on the freed socket.
sakisho-bot remarked a problem with rtnl_lock held in isotp_notify(), therefore make isotp_release() always call synchronize_rcu() before cancelling the timers, regardless of so->bound. This still closes the original race (isotp_notify() clearing so->bound without waiting for in-flight isotp_rcv() callers before isotp_release() cancels the RX timer) without adding any RCU wait to the netdevice notifier path.
Linux >= 22bfa94db2ef6900c790884fa9461486516626e9 < 945d9894502cd9124f5d676181c542ed2000f7c0Linux >= 14a4696bc3118ba49da28f79280e1d55603aa737 < 59672aa4bcd8d32172c1ff6a179583981d6acabcLinux >= 14a4696bc3118ba49da28f79280e1d55603aa737 < 15413a082df69175c2f96aeab4c26fe1ff7cff03Linux >= 14a4696bc3118ba49da28f79280e1d55603aa737 < 6280eda96e0707264849fa7d036fed873c1f8a6dLinux >= 14a4696bc3118ba49da28f79280e1d55603aa737 < cb6abc584a1bfab107ac003d64948a4aef1730aaLinux >= 14a4696bc3118ba49da28f79280e1d55603aa737 < b88a511308779c225005d7994b8744561bdbafbcLinux >= 14a4696bc3118ba49da28f79280e1d55603aa737 < b8278ff605187ef3fa0f2705e93251cce4c4f8eeLinux >= 14a4696bc3118ba49da28f79280e1d55603aa737 < 9b1a02e0d980ac6b0e36a90378f847062f81d7e4Linux 80c6ddf771df2ef786f28c1ca5919b3f1080091bLinux ebf91625b3e404bd2b4b694c7ee71c1e8f8bd08fLinux >= 5.10.50 < 5.10.261Linux >= 5.12.17 < 5.13Linux >= 5.13.2 < 5.14Linux 5.14Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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