CVE-2026-72115High· 8.1▾ TwilightIn the Linux kernel, the following vulnerability has been resolved: can: bcm: track a single source interface for ANYDEV timeout/throttle ops An ANYDEV rx op (ifindex == 0) with an active RX timeout and/or throttle timer has no defined…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 44.6 · likelihood 0.1 · 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
0.3%
In the Linux kernel, the following vulnerability has been resolved:
can: bcm: track a single source interface for ANYDEV timeout/throttle ops
An ANYDEV rx op (ifindex == 0) with an active RX timeout and/or throttle timer has no defined semantics when matching frames arrive from several interfaces: bcm_rx_handler() can run concurrently for the same op on different CPUs, racing hrtimer_cancel()/ bcm_rx_starttimer() against bcm_rx_timeout_handler() and causing spurious RX_TIMEOUT notifications and last_frames corruption. The same concurrency lets throttled multiplex frames from different interfaces clobber the single rx_ifindex/rx_stamp fields shared by the op.
Add op->if_detected to track the first interface that delivers a matching frame while a timeout/throttle timer is configured, and reject frames from any other interface for that op. The claim is decided in bcm_rx_handler() before hrtimer_cancel() touches op->timer, so a rejected frame can never disturb the claimed interface's watchdog. RTR-mode ops are excluded via RX_RTR_FRAME, independent of kt_ival1/kt_ival2, since those may briefly hold a stale value from an earlier non-RTR configuration.
The claim is released in bcm_notify() on NETDEV_UNREGISTER and in bcm_rx_setup() when SETTIMER reconfigures the timer values.
A (re-)claim is only possible on CAN devices in NETREG_REGISTERED dev->reg_state to cover the release in bcm_notify() where reg_state becomes NETREG_UNREGISTERING until synchronize_net().
Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < f147f48837cb1426521f5b3c3b3134c71128a25dLinux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 57cf104da4cf450ae9c16801a3164604b801d2ccLinux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 03dfe347c398fa41a7e30e8dc538f12568c183e6Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 18b45251e74e35668f0dd0c470549384ae191ecfLinux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 3ff8c24b421070a2db99a5cdb86edc9ff339418eLinux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < eca8b44d51fc6ab61022258ec968e55e3073b79eLinux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < b6317022b685a430a3ae420456716e3c0c02ef4bLinux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 2f5976f54a04e9f18b25283036ac3136be453b17Linux 2.6.25Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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