CVE-2026-72115 (GCVE-0-2026-72115)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-19 16:36
VLAI
Title
can: bcm: track a single source interface for ANYDEV timeout/throttle ops
Summary
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().
Severity
8.1 (High)
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < f147f48837cb1426521f5b3c3b3134c71128a25d (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 57cf104da4cf450ae9c16801a3164604b801d2cc (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 03dfe347c398fa41a7e30e8dc538f12568c183e6 (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 18b45251e74e35668f0dd0c470549384ae191ecf (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 3ff8c24b421070a2db99a5cdb86edc9ff339418e (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < eca8b44d51fc6ab61022258ec968e55e3073b79e (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < b6317022b685a430a3ae420456716e3c0c02ef4b (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 2f5976f54a04e9f18b25283036ac3136be453b17 (git)
guessed Create a notification for this product.
Linux Linux Affected: 2.6.25
Unaffected: 0 , < 2.6.25 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.148 , ≤ 6.6.* (semver)
Unaffected: 6.12.101 , ≤ 6.12.* (semver)
Unaffected: 6.18.42 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
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{
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      "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-\u003eif_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-\u003etimer, so a rejected frame can never disturb the claimed\ninterface\u0027s 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-\u003ereg_state to cover the release in bcm_notify() where reg_state\nbecomes NETREG_UNREGISTERING until synchronize_net()."
        }
      ],
      "metrics": [
        {
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
            "version": "3.1"
          },
          "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-\u003elast_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\u0027s 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."
            }
          ]
        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-19T16:36:03.316Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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        {
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      ],
      "title": "can: bcm: track a single source interface for ANYDEV timeout/throttle ops",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72115",
    "datePublished": "2026-08-15T05:52:55.524Z",
    "dateReserved": "2026-08-09T03:40:39.906Z",
    "dateUpdated": "2026-08-19T16:36:03.316Z",
    "state": "PUBLISHED"
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      "date": "2026-08-24",
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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-\u003eif_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-\u003etimer, so a rejected frame can never disturb the claimed\\ninterface\u0027s 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-\u003ereg_state to cover the release in bcm_notify() where reg_state\\nbecomes NETREG_UNREGISTERING until synchronize_net().\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/can/bcm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"ffd980f976e7fd666c2e61bf8ab35107efd11828\",\"lessThan\":\"f147f48837cb1426521f5b3c3b3134c71128a25d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ffd980f976e7fd666c2e61bf8ab35107efd11828\",\"lessThan\":\"57cf104da4cf450ae9c16801a3164604b801d2cc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ffd980f976e7fd666c2e61bf8ab35107efd11828\",\"lessThan\":\"03dfe347c398fa41a7e30e8dc538f12568c183e6\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ffd980f976e7fd666c2e61bf8ab35107efd11828\",\"lessThan\":\"18b45251e74e35668f0dd0c470549384ae191ecf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ffd980f976e7fd666c2e61bf8ab35107efd11828\",\"lessThan\":\"3ff8c24b421070a2db99a5cdb86edc9ff339418e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ffd980f976e7fd666c2e61bf8ab35107efd11828\",\"lessThan\":\"eca8b44d51fc6ab61022258ec968e55e3073b79e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ffd980f976e7fd666c2e61bf8ab35107efd11828\",\"lessThan\":\"b6317022b685a430a3ae420456716e3c0c02ef4b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ffd980f976e7fd666c2e61bf8ab35107efd11828\",\"lessThan\":\"2f5976f54a04e9f18b25283036ac3136be453b17\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/can/bcm.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.25\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.25\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.148\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.101\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.42\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"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\",\"attackVector\":\"ADJACENT_NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":2.8,\"impactScore\":5.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/03dfe347c398fa41a7e30e8dc538f12568c183e6\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/18b45251e74e35668f0dd0c470549384ae191ecf\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/2f5976f54a04e9f18b25283036ac3136be453b17\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/3ff8c24b421070a2db99a5cdb86edc9ff339418e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/57cf104da4cf450ae9c16801a3164604b801d2cc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b6317022b685a430a3ae420456716e3c0c02ef4b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eca8b44d51fc6ab61022258ec968e55e3073b79e\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f147f48837cb1426521f5b3c3b3134c71128a25d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T22:45:22+00:00",
      "cve": "CVE-2026-72115",
      "id": "CVE-2026-72115",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: can: bcm: track a single source interface for ANYDEV timeout/throttle ops",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72115.json",
      "version": "3"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.