{"id":"CVE-2026-72113","title":"can: bcm: add missing device refcount for CAN filter removal","summary":"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…","severity":"high","cvss":7.8,"cvssVector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","cvssSource":"cna","vendor":"Linux","product":"Linux","affected":["Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < bd5232663524e94cc5aad861dca11e3db8e2ab6f","Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < ee8b36d0faca08f35b889b6e9aa850695e5b8ba9","Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < dcaee869913c7210cd47ed0a8f27349d7bdcdb7b","Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 84aa4807816e405c1bf87114fc63e06d244281ef","Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 633bda66fbf309f5de5e1ad6defe8e6b1d77a20f","Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < b024c21c9066f6957b7d4a8f2037e4b000c5e041","Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 04d23061bbf18d5d81022eb21e9d32e99d24468d","Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < d59948293ea34b6337ce2b5febab8510de70048c","Linux 2.6.25"],"ssvc":{"exploitation":"none","automatable":"no","technicalImpact":"total","timestamp":"2026-10-16T18:41:41.918613Z"},"published":"2026-08-15","updated":"2026-10-16","sourceUpdated":"2026-10-16T18:44:56.440Z","source":"CVEORG","sourceUrl":"https://www.cve.org/CVERecord?id=CVE-2026-72113","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"}],"tags":["cve.org"],"epss":0.00169,"epssPercentile":0.05785,"ingestedAt":"2026-10-16T19:46:24.432Z","slug":"CVE-2026-72113","body":"## Overview\n\nIn 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.\n\n## Affected\n\n- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < bd5232663524e94cc5aad861dca11e3db8e2ab6f`\n- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < ee8b36d0faca08f35b889b6e9aa850695e5b8ba9`\n- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < dcaee869913c7210cd47ed0a8f27349d7bdcdb7b`\n- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 84aa4807816e405c1bf87114fc63e06d244281ef`\n- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 633bda66fbf309f5de5e1ad6defe8e6b1d77a20f`\n- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < b024c21c9066f6957b7d4a8f2037e4b000c5e041`\n- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < 04d23061bbf18d5d81022eb21e9d32e99d24468d`\n- `Linux >= ffd980f976e7fd666c2e61bf8ab35107efd11828 < d59948293ea34b6337ce2b5febab8510de70048c`\n- `Linux 2.6.25`\n\n## Remediation\n\nRefer to the linked advisories for vendor-supplied fixes and affected version ranges.","depth":"twilight","depthScore":43,"depthScoreParts":{"impact":42.9,"likelihood":0,"exploitation":0,"ransomware":0},"changes":[]}