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can: bcm: track a single source interface for ANYDEV timeout/throttle ops

Type: advisorySource: Official CVE List1 source record

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().

Announced Source revision 1
Original source ↗

CVE-2026-72115

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-72115

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "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"
      }
    ],
    "programFiles": [
      "net/can/bcm.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.25"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.25",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "5.10.265",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.216",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.183",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.148",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.101",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.42",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "7.1.5",
        "versionType": "semver",
        "lessThanOrEqual": "7.1.*"
      },
      {
        "status": "unaffected",
        "version": "7.2",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "net/can/bcm.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-72115

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#32944 · Revision 1
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Publisher date
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