High 7.8Published Aug 15, 2026

CVE-2026-72126can: isotp: use unconditional synchronize_rcu() in isotp_release()

Updated under an hour ago (Oct 27, 2026, 5:30 AM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

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.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Received
Record last updated: Oct 16, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 22bfa94db2ef6900c790884fa9461486516626e9 before 945d9894502cd9124f5d676181c542ed2000f7c0; from 14a4696bc3118ba49da28f79280e1d55603aa737 before 59672aa4bcd8d32172c1ff6a179583981d6acabc; from 14a4696bc3118ba49da28f79280e1d55603aa737 before 15413a082df69175c2f96aeab4c26fe1ff7cff03; from 14a4696bc3118ba49da28f79280e1d55603aa737 before 6280eda96e0707264849fa7d036fed873c1f8a6d; from 14a4696bc3118ba49da28f79280e1d55603aa737 before cb6abc584a1bfab107ac003d64948a4aef1730aa; from 14a4696bc3118ba49da28f79280e1d55603aa737 before b88a511308779c225005d7994b8744561bdbafbc; from 14a4696bc3118ba49da28f79280e1d55603aa737 before b8278ff605187ef3fa0f2705e93251cce4c4f8ee; 14a4696bc3118ba49da28f79280e1d55603aa737 builds before 9b1a02e0d980ac6b0e36a90378f847062f81d7e4; and 5 more ranges	CNA record

References

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

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.