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CVE-2026-72113 (GCVE-0-2026-72113)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-19 16:35
VLAI
Title
can: bcm: add missing device refcount for CAN filter removal
Summary
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.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < bd5232663524e94cc5aad861dca11e3db8e2ab6f (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < ee8b36d0faca08f35b889b6e9aa850695e5b8ba9 (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < dcaee869913c7210cd47ed0a8f27349d7bdcdb7b (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 84aa4807816e405c1bf87114fc63e06d244281ef (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 633bda66fbf309f5de5e1ad6defe8e6b1d77a20f (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < b024c21c9066f6957b7d4a8f2037e4b000c5e041 (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < 04d23061bbf18d5d81022eb21e9d32e99d24468d (git)
Affected: ffd980f976e7fd666c2e61bf8ab35107efd11828 , < d59948293ea34b6337ce2b5febab8510de70048c (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: add missing device refcount for CAN filter removal\n\nsashiko-bot remarked a problem with a concurrent device unregistration\nin isotp.c which also is present in the bcm.c code. A former fix for raw.c\ncommit c275a176e4b6 (\"can: raw: add missing refcount for memory leak fix\")\nintroduced a netdevice_tracker which solves the issue for bcm.c too.\n\nbcm_release(), bcm_delete_rx_op() and bcm_notifier() relied on\ndev_get_by_index(ifindex) to re-find the device for an rx_op before\nunregistering its filter. If a concurrent NETDEV_UNREGISTER has already\nunlisted the device from the ifindex table, that lookup fails and\ncan_rx_unregister() is silently skipped, leaving a stale CAN filter\npointing at the soon-to-be-freed bcm_op/socket.\n\nHold a netdev_hold()/netdev_put() tracked reference on op-\u003erx_reg_dev\nfrom the moment the rx filter is registered in bcm_rx_setup() until it\nis unregistered in bcm_rx_unreg(), and use that reference directly in\nbcm_release() and bcm_delete_rx_op() instead of re-looking the device\nup by ifindex."
        }
      ],
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - Exploitation requires local syscalls (socket/sendmsg/close) on PF_CAN/CAN_BCM and concurrent netdev teardown via netlink; the flaw is in local filter cleanup, not remote IP packet handling.\nAC:L - An attacker can reliably win the race by concurrently closing the BCM socket or issuing RX_DELETE while deleting the bound vcan/CAN interface from the same user namespace.\nPR:L - BCM sockets need no special capability, and CAP_NET_ADMIN for creating/deleting vcan interfaces is obtainable by unprivileged users via user namespaces (unshare -Urn).\nUI:N - No victim interaction is required; exploitation is fully attacker-driven through BCM socket setup, concurrent netdev removal, and subsequent CAN traffic to hit the stale filter.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same security authority; it does not cross VM, container, or IOMMU boundaries.\nC:H - Stale CAN filters leave a use-after-free on freed bcm_op structures; bcm_rx_handler dereferences attacker-influenced freed memory, enabling arbitrary kernel memory disclosure via heap grooming.\nI:H - The UAF in bcm_rx_handler provides write primitives over freed bcm_op fields (timers, frame buffers, socket pointers), enabling control-flow hijacking and arbitrary kernel code execution.\nA:H - Accessing the freed bcm_op from bcm_rx_handler causes kernel oops/panic; UAF is inherently crash-prone even before full exploitation."
            }
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        "dateUpdated": "2026-08-19T16:35:58.404Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
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          "url": "https://git.kernel.org/stable/c/bd5232663524e94cc5aad861dca11e3db8e2ab6f"
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          "url": "https://git.kernel.org/stable/c/ee8b36d0faca08f35b889b6e9aa850695e5b8ba9"
        },
        {
          "url": "https://git.kernel.org/stable/c/dcaee869913c7210cd47ed0a8f27349d7bdcdb7b"
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      "title": "can: bcm: add missing device refcount for CAN filter removal",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72113",
    "datePublished": "2026-08-15T05:52:54.001Z",
    "dateReserved": "2026-08-09T03:40:39.906Z",
    "dateUpdated": "2026-08-19T16:35:58.404Z",
    "state": "PUBLISHED"
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      "date": "2026-09-10",
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If a concurrent NETDEV_UNREGISTER has already\\nunlisted the device from the ifindex table, that lookup fails and\\ncan_rx_unregister() is silently skipped, leaving a stale CAN filter\\npointing at the soon-to-be-freed bcm_op/socket.\\n\\nHold a netdev_hold()/netdev_put() tracked reference on op-\u003erx_reg_dev\\nfrom the moment the rx filter is registered in bcm_rx_setup() until it\\nis unregistered in bcm_rx_unreg(), and use that reference directly in\\nbcm_release() and bcm_delete_rx_op() instead of re-looking the device\\nup by ifindex.\"}],\"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\":\"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\",\"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:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/04d23061bbf18d5d81022eb21e9d32e99d24468d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/633bda66fbf309f5de5e1ad6defe8e6b1d77a20f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/84aa4807816e405c1bf87114fc63e06d244281ef\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b024c21c9066f6957b7d4a8f2037e4b000c5e041\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/bd5232663524e94cc5aad861dca11e3db8e2ab6f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d59948293ea34b6337ce2b5febab8510de70048c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/dcaee869913c7210cd47ed0a8f27349d7bdcdb7b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/ee8b36d0faca08f35b889b6e9aa850695e5b8ba9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T22:45:06+00:00",
      "cve": "CVE-2026-72113",
      "id": "CVE-2026-72113",
      "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: add missing device refcount for CAN filter removal",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72113.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-28T16:40:31Z",
      "cve": "CVE-2026-72113",
      "id": "CVE-2026-72113",
      "initial_release_date": "2026-08-28T01:00:48Z",
      "product_status:known_affected": "362",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72113",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72113.json",
      "version": "3"
    }
  }
}



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  • 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.