FKIE_CVE-2026-72115

Vulnerability from fkie_nvd - Published: 2026-08-15 06:21 - Updated: 2026-08-19 17:20
Severity
8.1 (High) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
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().
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/03dfe347c398fa41a7e30e8dc538f12568c183e6
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/18b45251e74e35668f0dd0c470549384ae191ecf
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/2f5976f54a04e9f18b25283036ac3136be453b17
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3ff8c24b421070a2db99a5cdb86edc9ff339418e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/57cf104da4cf450ae9c16801a3164604b801d2cc
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/b6317022b685a430a3ae420456716e3c0c02ef4b
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/eca8b44d51fc6ab61022258ec968e55e3073b79e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/f147f48837cb1426521f5b3c3b3134c71128a25d
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/can/bcm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "f147f48837cb1426521f5b3c3b3134c71128a25d",
              "status": "affected",
              "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
              "versionType": "git"
            },
            {
              "lessThan": "57cf104da4cf450ae9c16801a3164604b801d2cc",
              "status": "affected",
              "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
              "versionType": "git"
            },
            {
              "lessThan": "03dfe347c398fa41a7e30e8dc538f12568c183e6",
              "status": "affected",
              "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
              "versionType": "git"
            },
            {
              "lessThan": "18b45251e74e35668f0dd0c470549384ae191ecf",
              "status": "affected",
              "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
              "versionType": "git"
            },
            {
              "lessThan": "3ff8c24b421070a2db99a5cdb86edc9ff339418e",
              "status": "affected",
              "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
              "versionType": "git"
            },
            {
              "lessThan": "eca8b44d51fc6ab61022258ec968e55e3073b79e",
              "status": "affected",
              "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
              "versionType": "git"
            },
            {
              "lessThan": "b6317022b685a430a3ae420456716e3c0c02ef4b",
              "status": "affected",
              "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
              "versionType": "git"
            },
            {
              "lessThan": "2f5976f54a04e9f18b25283036ac3136be453b17",
              "status": "affected",
              "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/can/bcm.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "2.6.25"
            },
            {
              "lessThan": "2.6.25",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.265",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.216",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.183",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.148",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.101",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.42",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.1.*",
              "status": "unaffected",
              "version": "7.1.5",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.2",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "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()."
    }
  ],
  "id": "CVE-2026-72115",
  "lastModified": "2026-08-19T17:20:57.797",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "NONE",
          "baseScore": 8.1,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N",
          "version": "3.1"
        },
        "exploitabilityScore": 2.8,
        "impactScore": 5.2,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-08-15T06:21:25.900",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "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"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}



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