{"api_version":"1","generated_at":"2026-08-22T02:57:03+00:00","cve":"CVE-2026-72113","urls":{"html":"https://cve.report/CVE-2026-72113","api":"https://cve.report/api/cve/CVE-2026-72113.json","docs":"https://cve.report/api","cve_org":"https://www.cve.org/CVERecord?id=CVE-2026-72113","nvd":"https://nvd.nist.gov/vuln/detail/CVE-2026-72113"},"summary":{"title":"can: bcm: add missing device refcount for CAN filter removal","description":"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->rx_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.","state":"PUBLISHED","assigner":"Linux","published_at":"2026-08-15 06:21:25","updated_at":"2026-08-17 06:18:10"},"problem_types":[],"metrics":[{"version":"3.1","source":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","type":"Secondary","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"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"}},{"version":"3.1","source":"CNA","type":"DECLARED","score":"7.8","severity":"HIGH","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","data":{"baseScore":7.8,"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"}}],"references":[{"url":"https://git.kernel.org/stable/c/84aa4807816e405c1bf87114fc63e06d244281ef","name":"https://git.kernel.org/stable/c/84aa4807816e405c1bf87114fc63e06d244281ef","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/04d23061bbf18d5d81022eb21e9d32e99d24468d","name":"https://git.kernel.org/stable/c/04d23061bbf18d5d81022eb21e9d32e99d24468d","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/633bda66fbf309f5de5e1ad6defe8e6b1d77a20f","name":"https://git.kernel.org/stable/c/633bda66fbf309f5de5e1ad6defe8e6b1d77a20f","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/d59948293ea34b6337ce2b5febab8510de70048c","name":"https://git.kernel.org/stable/c/d59948293ea34b6337ce2b5febab8510de70048c","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/bd5232663524e94cc5aad861dca11e3db8e2ab6f","name":"https://git.kernel.org/stable/c/bd5232663524e94cc5aad861dca11e3db8e2ab6f","refsource":"https://git.kernel.org/stable/c/bd5232663524e94cc5aad861dca11e3db8e2ab6f","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/dcaee869913c7210cd47ed0a8f27349d7bdcdb7b","name":"https://git.kernel.org/stable/c/dcaee869913c7210cd47ed0a8f27349d7bdcdb7b","refsource":"https://git.kernel.org/stable/c/dcaee869913c7210cd47ed0a8f27349d7bdcdb7b","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/ee8b36d0faca08f35b889b6e9aa850695e5b8ba9","name":"https://git.kernel.org/stable/c/ee8b36d0faca08f35b889b6e9aa850695e5b8ba9","refsource":"https://git.kernel.org/stable/c/ee8b36d0faca08f35b889b6e9aa850695e5b8ba9","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://git.kernel.org/stable/c/b024c21c9066f6957b7d4a8f2037e4b000c5e041","name":"https://git.kernel.org/stable/c/b024c21c9066f6957b7d4a8f2037e4b000c5e041","refsource":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","tags":[],"title":"","mime":"","httpstatus":"","archivestatus":"0"},{"url":"https://www.cve.org/CVERecord?id=CVE-2026-72113","name":"CVE Program record","refsource":"CVE.ORG","tags":["canonical"]},{"url":"https://nvd.nist.gov/vuln/detail/CVE-2026-72113","name":"NVD vulnerability detail","refsource":"NVD","tags":["canonical","analysis"]}],"affected":[{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ffd980f976e7fd666c2e61bf8ab35107efd11828 bd5232663524e94cc5aad861dca11e3db8e2ab6f git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ffd980f976e7fd666c2e61bf8ab35107efd11828 ee8b36d0faca08f35b889b6e9aa850695e5b8ba9 git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ffd980f976e7fd666c2e61bf8ab35107efd11828 dcaee869913c7210cd47ed0a8f27349d7bdcdb7b git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected ffd980f976e7fd666c2e61bf8ab35107efd11828 84aa4807816e405c1bf87114fc63e06d244281ef git","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"affected 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semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 5.15.216 5.15.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.1.183 6.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.6.148 6.6.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.12.101 6.12.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 6.18.42 6.18.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.1.5 7.1.* semver","platforms":[]},{"source":"CNA","vendor":"Linux","product":"Linux","version":"unaffected 7.2 * original_commit_for_fix","platforms":[]}],"timeline":[],"solutions":[],"workarounds":[],"exploits":[],"credits":[],"nvd_cpes":[],"vendor_comments":[],"enrichments":{"kev":null,"epss":{"cve_year":"2026","cve_id":"72113","cve":"CVE-2026-72113","epss":"0.001630000","percentile":"0.060390000","score_date":"2026-08-19","updated_at":"2026-08-20 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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->rx_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."}],"metrics":[{"cvssV3_1":{"baseScore":7.8,"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."}]}],"providerMetadata":{"dateUpdated":"2026-08-19T16:35:58.404Z","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux"},"references":[{"url":"https://git.kernel.org/stable/c/bd5232663524e94cc5aad861dca11e3db8e2ab6f"},{"url":"https://git.kernel.org/stable/c/ee8b36d0faca08f35b889b6e9aa850695e5b8ba9"},{"url":"https://git.kernel.org/stable/c/dcaee869913c7210cd47ed0a8f27349d7bdcdb7b"},{"url":"https://git.kernel.org/stable/c/84aa4807816e405c1bf87114fc63e06d244281ef"},{"url":"https://git.kernel.org/stable/c/633bda66fbf309f5de5e1ad6defe8e6b1d77a20f"},{"url":"https://git.kernel.org/stable/c/b024c21c9066f6957b7d4a8f2037e4b000c5e041"},{"url":"https://git.kernel.org/stable/c/04d23061bbf18d5d81022eb21e9d32e99d24468d"},{"url":"https://git.kernel.org/stable/c/d59948293ea34b6337ce2b5febab8510de70048c"}],"title":"can: bcm: add missing device refcount for CAN filter removal","x_generator":{"engine":"bippy-1.2.0"}}},"cveMetadata":{"assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","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"},"dataType":"CVE_RECORD","dataVersion":"5.2"},"nvd":{"publishedDate":"2026-08-15 06:21:25","lastModifiedDate":"2026-08-17 06:18:10","problem_types":[],"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}]},"configurations":[]},"legacy_mitre":{"record":{"CveYear":"2026","CveId":"72113","Ordinal":"1","Title":"can: bcm: add missing device refcount for CAN filter removal","CVE":"CVE-2026-72113","Year":"2026"},"notes":[{"CveYear":"2026","CveId":"72113","Ordinal":"1","NoteData":"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->rx_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.","Type":"Description","Title":"can: bcm: add missing device refcount for CAN filter removal"}]}}}