{"id":"CVE-2026-72115","state":"PUBLISHED","title":"can: bcm: track a single source interface for ANYDEV timeout/throttle ops","description":"In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: track a single source interface for ANYDEV timeout/throttle ops\n\nAn ANYDEV rx op (ifindex == 0) with an active RX timeout and/or\nthrottle timer has no defined semantics when matching frames arrive\nfrom several interfaces: bcm_rx_handler() can run concurrently for\nthe same op on different CPUs, racing hrtimer_cancel()/\nbcm_rx_starttimer() against bcm_rx_timeout_handler() and causing\nspurious RX_TIMEOUT notifications and last_frames corruption. The\nsame concurrency lets throttled multiplex frames from different\ninterfaces clobber the single rx_ifindex/rx_stamp fields shared by\nthe op.\n\nAdd op->if_detected to track the first interface that delivers a\nmatching frame while a timeout/throttle timer is configured, and\nreject frames from any other interface for that op. The claim is\ndecided in bcm_rx_handler() before hrtimer_cancel() touches\nop->timer, so a rejected frame can never disturb the claimed\ninterface's watchdog. RTR-mode ops are excluded via RX_RTR_FRAME,\nindependent of kt_ival1/kt_ival2, since those may briefly hold a\nstale value from an earlier non-RTR configuration.\n\nThe claim is released in bcm_notify() on NETDEV_UNREGISTER and in\nbcm_rx_setup() when SETTIMER reconfigures the timer values.\n\nA (re-)claim is only possible on CAN devices in NETREG_REGISTERED\ndev->reg_state to cover the release in bcm_notify() where reg_state\nbecomes NETREG_UNREGISTERING until synchronize_net().","publishedAt":"2026-08-15T05:52:55.524Z","updatedAt":"2026-10-16T18:44:56.703Z","severity":{"score":8.1,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ffd980f976e7fd666c2e61bf8ab35107efd11828","status":"affected","lessThan":"f147f48837cb1426521f5b3c3b3134c71128a25d","versionType":"git"},{"version":"ffd980f976e7fd666c2e61bf8ab35107efd11828","status":"affected","lessThan":"57cf104da4cf450ae9c16801a3164604b801d2cc","versionType":"git"},{"version":"ffd980f976e7fd666c2e61bf8ab35107efd11828","status":"affected","lessThan":"03dfe347c398fa41a7e30e8dc538f12568c183e6","versionType":"git"},{"version":"ffd980f976e7fd666c2e61bf8ab35107efd11828","status":"affected","lessThan":"18b45251e74e35668f0dd0c470549384ae191ecf","versionType":"git"},{"version":"ffd980f976e7fd666c2e61bf8ab35107efd11828","status":"affected","lessThan":"3ff8c24b421070a2db99a5cdb86edc9ff339418e","versionType":"git"},{"version":"ffd980f976e7fd666c2e61bf8ab35107efd11828","status":"affected","lessThan":"eca8b44d51fc6ab61022258ec968e55e3073b79e","versionType":"git"},{"version":"ffd980f976e7fd666c2e61bf8ab35107efd11828","status":"affected","lessThan":"b6317022b685a430a3ae420456716e3c0c02ef4b","versionType":"git"},{"version":"ffd980f976e7fd666c2e61bf8ab35107efd11828","status":"affected","lessThan":"2f5976f54a04e9f18b25283036ac3136be453b17","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/can/bcm.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.25","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.25","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/can/bcm.c"]}],"references":["https://git.kernel.org/stable/c/f147f48837cb1426521f5b3c3b3134c71128a25d","https://git.kernel.org/stable/c/57cf104da4cf450ae9c16801a3164604b801d2cc","https://git.kernel.org/stable/c/03dfe347c398fa41a7e30e8dc538f12568c183e6","https://git.kernel.org/stable/c/18b45251e74e35668f0dd0c470549384ae191ecf","https://git.kernel.org/stable/c/3ff8c24b421070a2db99a5cdb86edc9ff339418e","https://git.kernel.org/stable/c/eca8b44d51fc6ab61022258ec968e55e3073b79e","https://git.kernel.org/stable/c/b6317022b685a430a3ae420456716e3c0c02ef4b","https://git.kernel.org/stable/c/2f5976f54a04e9f18b25283036ac3136be453b17"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72115.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72115","state":"PUBLISHED","datePublished":"2026-08-15T05:52:55.524Z","dateUpdated":"2026-10-16T18:44:56.703Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.906Z"},"containers":{"cna":{"title":"can: bcm: track a single source interface for ANYDEV timeout/throttle ops","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\ncan: bcm: track a single source interface for ANYDEV timeout/throttle ops\n\nAn ANYDEV rx op (ifindex == 0) with an active RX timeout and/or\nthrottle timer has no defined semantics when matching frames arrive\nfrom several interfaces: bcm_rx_handler() can run concurrently for\nthe same op on different CPUs, racing hrtimer_cancel()/\nbcm_rx_starttimer() against bcm_rx_timeout_handler() and causing\nspurious RX_TIMEOUT notifications and last_frames corruption. The\nsame concurrency lets throttled multiplex frames from different\ninterfaces clobber the single rx_ifindex/rx_stamp fields shared by\nthe op.\n\nAdd op->if_detected to track the first interface that delivers a\nmatching frame while a timeout/throttle timer is configured, and\nreject frames from any other interface for that op. The claim is\ndecided in bcm_rx_handler() before hrtimer_cancel() touches\nop->timer, so a rejected frame can never disturb the claimed\ninterface's watchdog. RTR-mode ops are excluded via RX_RTR_FRAME,\nindependent of kt_ival1/kt_ival2, since those may briefly hold a\nstale value from an earlier non-RTR configuration.\n\nThe claim is released in bcm_notify() on NETDEV_UNREGISTER and in\nbcm_rx_setup() when SETTIMER reconfigures the timer values.\n\nA (re-)claim is only possible on CAN devices in NETREG_REGISTERED\ndev->reg_state to cover the release in bcm_notify() where reg_state\nbecomes NETREG_UNREGISTERING until synchronize_net()."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"ffd980f976e7fd666c2e61bf8ab35107efd11828","status":"affected","lessThan":"f147f48837cb1426521f5b3c3b3134c71128a25d","versionType":"git"},{"version":"ffd980f976e7fd666c2e61bf8ab35107efd11828","status":"affected","lessThan":"57cf104da4cf450ae9c16801a3164604b801d2cc","versionType":"git"},{"version":"ffd980f976e7fd666c2e61bf8ab35107efd11828","status":"affected","lessThan":"03dfe347c398fa41a7e30e8dc538f12568c183e6","versionType":"git"},{"version":"ffd980f976e7fd666c2e61bf8ab35107efd11828","status":"affected","lessThan":"18b45251e74e35668f0dd0c470549384ae191ecf","versionType":"git"},{"version":"ffd980f976e7fd666c2e61bf8ab35107efd11828","status":"affected","lessThan":"3ff8c24b421070a2db99a5cdb86edc9ff339418e","versionType":"git"},{"version":"ffd980f976e7fd666c2e61bf8ab35107efd11828","status":"affected","lessThan":"eca8b44d51fc6ab61022258ec968e55e3073b79e","versionType":"git"},{"version":"ffd980f976e7fd666c2e61bf8ab35107efd11828","status":"affected","lessThan":"b6317022b685a430a3ae420456716e3c0c02ef4b","versionType":"git"},{"version":"ffd980f976e7fd666c2e61bf8ab35107efd11828","status":"affected","lessThan":"2f5976f54a04e9f18b25283036ac3136be453b17","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/can/bcm.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"2.6.25","status":"affected"},{"version":"0","status":"unaffected","lessThan":"2.6.25","versionType":"semver"},{"version":"5.10.265","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.216","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.183","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.148","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.101","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.42","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/can/bcm.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f147f48837cb1426521f5b3c3b3134c71128a25d"},{"url":"https://git.kernel.org/stable/c/57cf104da4cf450ae9c16801a3164604b801d2cc"},{"url":"https://git.kernel.org/stable/c/03dfe347c398fa41a7e30e8dc538f12568c183e6"},{"url":"https://git.kernel.org/stable/c/18b45251e74e35668f0dd0c470549384ae191ecf"},{"url":"https://git.kernel.org/stable/c/3ff8c24b421070a2db99a5cdb86edc9ff339418e"},{"url":"https://git.kernel.org/stable/c/eca8b44d51fc6ab61022258ec968e55e3073b79e"},{"url":"https://git.kernel.org/stable/c/b6317022b685a430a3ae420456716e3c0c02ef4b"},{"url":"https://git.kernel.org/stable/c/2f5976f54a04e9f18b25283036ac3136be453b17"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N","baseScore":8.1,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:A - bcm_rx_handler() is reached from the CAN driver RX path when matching frames arrive on multiple interfaces; on automotive/industrial systems an attacker on shared CAN segment(s) can inject concurrent frames without host shell access once an ANYDEV BCM RX op with active timeout/throttle timers exists.\nAC:L - The attacker controls both sides of the race by flooding matching frames on multiple CAN interfaces (or paired vcan devices) to run bcm_rx_handler() concurrently on different CPUs, racing hrtimer_cancel/bcm_rx_starttimer against bcm_rx_timeout_handler and interleaved last_frames writers.\nPR:N - No Linux capability or account is required to deliver triggering CAN traffic on multiple interfaces; bcm_rx_handler() runs from the unauthenticated netdev RX path once any ANYDEV BCM RX op with active kt_ival1/kt_ival2 timers exists, as commonly configured by telematics/diagnostic daemons.\nUI:N - Exploitation requires no victim interaction beyond normal system operation; malicious or concurrent CAN frames are processed automatically in softirq without mounts, file opens, or user prompts.\nS:U - Impact is confined to corrupted BCM state and incorrect CAN notifications delivered to the subscribing userspace process within the same kernel/host security boundary; no VM, container, or IOMMU escape is involved.\nC:H - Concurrent bcm_rx_handler() and bcm_rx_timeout_handler() races corrupt op->last_frames heap buffers via unsynchronized memcpy/memset, mixing attacker-controlled CAN payloads from different interfaces and leaking cross-bus frame content through bcm_send_to_user().\nI:H - last_frames corruption lets attacker-controlled frames from one interface overwrite or interleave with another's stored/throttled state, misattributing RX_CHANGED/RX_TIMEOUT notifications and corrupting safety- or security-relevant CAN monitoring and control decisions.\nA:N - The race corrupts per-op BCM buffers and emits spurious RX_TIMEOUT events but does not dereference freed objects, overrun buffer bounds, or fault the kernel; no oops, panic, hang, or sustained kernel denial of service is indicated."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-19T16:36:03.316Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"5.10.265"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"5.15.216"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.1.183"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.6.148"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.12.101"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"6.18.42"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.25","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-72115","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"no"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T18:41:50.278770Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T18:44:56.703Z"}}]}}}