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can: bcm: add missing device refcount for CAN filter removal

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: can: bcm: add missing device refcount for CAN filter removal sashiko-bot remarked a problem with a concurrent device unregistration in isotp.c which also is present in the bcm.c code. A former fix for raw.c commit c275a176e4b6 ("can: raw: add missing refcount for memory leak fix") introduced a netdevice_tracker which solves the issue for bcm.c too. bcm_release(), bcm_delete_rx_op() and bcm_notifier() relied on dev_get_by_index(ifindex) to re-find the device for an rx_op before unregistering its filter. If a concurrent NETDEV_UNREGISTER has already unlisted the device from the ifindex table, that lookup fails and can_rx_unregister() is silently skipped, leaving a stale CAN filter pointing at the soon-to-be-freed bcm_op/socket. Hold a netdev_hold()/netdev_put() tracked reference on op->rx_reg_dev from the moment the rx filter is registered in bcm_rx_setup() until it is unregistered in bcm_rx_unreg(), and use that reference directly in bcm_release() and bcm_delete_rx_op() instead of re-looking the device up by ifindex.

Announced Source revision 1
Original source ↗

CVE-2026-72113

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-2026-72113

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": "bd5232663524e94cc5aad861dca11e3db8e2ab6f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
        "lessThan": "ee8b36d0faca08f35b889b6e9aa850695e5b8ba9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
        "lessThan": "dcaee869913c7210cd47ed0a8f27349d7bdcdb7b",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
        "lessThan": "84aa4807816e405c1bf87114fc63e06d244281ef",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
        "lessThan": "633bda66fbf309f5de5e1ad6defe8e6b1d77a20f",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
        "lessThan": "b024c21c9066f6957b7d4a8f2037e4b000c5e041",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
        "lessThan": "04d23061bbf18d5d81022eb21e9d32e99d24468d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "ffd980f976e7fd666c2e61bf8ab35107efd11828",
        "lessThan": "d59948293ea34b6337ce2b5febab8510de70048c",
        "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-2026-72113

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#32941 · Revision 1
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Publisher date
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