{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72115", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.906Z", "datePublished": "2026-08-15T05:52:55.524Z", "dateUpdated": "2026-08-19T16:36:03.316Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:36:03.316Z" }, "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()." } ], "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/can/bcm.c" ], "versions": [ { "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828", "lessThan": "f147f48837cb1426521f5b3c3b3134c71128a25d", "status": "affected", "versionType": "git" }, { "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828", "lessThan": "57cf104da4cf450ae9c16801a3164604b801d2cc", "status": "affected", "versionType": "git" }, { "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828", "lessThan": "03dfe347c398fa41a7e30e8dc538f12568c183e6", "status": "affected", "versionType": "git" }, { "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828", "lessThan": "18b45251e74e35668f0dd0c470549384ae191ecf", "status": "affected", "versionType": "git" }, { "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828", "lessThan": "3ff8c24b421070a2db99a5cdb86edc9ff339418e", "status": "affected", "versionType": "git" }, { "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828", "lessThan": "eca8b44d51fc6ab61022258ec968e55e3073b79e", "status": "affected", "versionType": "git" }, { "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828", "lessThan": "b6317022b685a430a3ae420456716e3c0c02ef4b", "status": "affected", "versionType": "git" }, { "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828", "lessThan": "2f5976f54a04e9f18b25283036ac3136be453b17", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "net/can/bcm.c" ], "versions": [ { "version": "2.6.25", "status": "affected" }, { "version": "0", "lessThan": "2.6.25", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.148", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.101", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.42", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "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" } ] } ] } ], "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" } ], "title": "can: bcm: track a single source interface for ANYDEV timeout/throttle ops", "x_generator": { "engine": "bippy-1.2.0" } } } }