CVE-2026-72125 (GCVE-0-2026-72125)
Vulnerability from cvelistv5
Published
2026-08-15 05:53
Modified
2026-10-16 18:44
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: can: isotp: fix use-after-free race with concurrent NETDEV_UNREGISTER isotp_release() looked up the bound network device via dev_get_by_index() using the stored ifindex. During device unregistration the device is unlisted from the ifindex hash before the NETDEV_UNREGISTER notifier chain runs, so a concurrent isotp_release() could find no device, skip can_rx_unregister() entirely, and still proceed to free the socket. Since isotp_release() had already removed itself from the isotp notifier list at that point, isotp_notify() would never get a chance to clean up either, leaving a stale CAN filter that keeps pointing at the freed socket. Fix this the same way raw.c already does: hold a tracked reference to the bound net_device in the socket (so->dev/so->dev_tracker) from bind() onward instead of re-resolving it from the ifindex, and serialize bind()/release() with rtnl_lock() so that so->dev is always consistent with what the NETDEV_UNREGISTER notifier sees. so->dev stays valid regardless of ifindex-hash unlisting, and is only ever cleared by whichever of isotp_release()/isotp_notify() gets there first, so the filter is always removed exactly once. isotp_bind() now rejects a (re)bind with -EAGAIN while so->[tx|rx].state isn't ISOTP_IDLE yet, so a timer left running by a prior NETDEV_UNREGISTER can't act on a newly bound so->ifindex. Both checks share the same lock_sock() section, so there is no window in which a concurrent isotp_notify() clearing so->bound could be missed.
References
Impacted products
Vendor Product Version
Linux Linux Version: e057dd3fc20ffb3d7f150af46542a51b59b90127
Version: e057dd3fc20ffb3d7f150af46542a51b59b90127
Version: e057dd3fc20ffb3d7f150af46542a51b59b90127
Version: e057dd3fc20ffb3d7f150af46542a51b59b90127
Version: e057dd3fc20ffb3d7f150af46542a51b59b90127
Version: e057dd3fc20ffb3d7f150af46542a51b59b90127
Version: e057dd3fc20ffb3d7f150af46542a51b59b90127
Version: e057dd3fc20ffb3d7f150af46542a51b59b90127
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ncan: isotp: fix use-after-free race with concurrent NETDEV_UNREGISTER\n\nisotp_release() looked up the bound network device via dev_get_by_index()\nusing the stored ifindex. During device unregistration the device is\nunlisted from the ifindex hash before the NETDEV_UNREGISTER notifier\nchain runs, so a concurrent isotp_release() could find no device, skip\ncan_rx_unregister() entirely, and still proceed to free the socket.\nSince isotp_release() had already removed itself from the isotp\nnotifier list at that point, isotp_notify() would never get a chance to\nclean up either, leaving a stale CAN filter that keeps pointing at the\nfreed socket.\n\nFix this the same way raw.c already does: hold a tracked reference to\nthe bound net_device in the socket (so-\u003edev/so-\u003edev_tracker) from\nbind() onward instead of re-resolving it from the ifindex, and\nserialize bind()/release() with rtnl_lock() so that so-\u003edev is always\nconsistent with what the NETDEV_UNREGISTER notifier sees. so-\u003edev\nstays valid regardless of ifindex-hash unlisting, and is only ever\ncleared by whichever of isotp_release()/isotp_notify() gets there\nfirst, so the filter is always removed exactly once.\n\nisotp_bind() now rejects a (re)bind with -EAGAIN while so-\u003e[tx|rx].state\nisn\u0027t ISOTP_IDLE yet, so a timer left running by a prior\nNETDEV_UNREGISTER can\u0027t act on a newly bound so-\u003eifindex. Both checks\nshare the same lock_sock() section, so there is no window in which a\nconcurrent isotp_notify() clearing so-\u003ebound could be missed."
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              "value": "AV:L - Exploitation requires local AF_CAN ISO-TP socket operations (socket/bind/close) racing NETDEV_UNREGISTER on the bound CAN interface; stale-filter UAF is triggered via local frame injection or an existing bound interface, not a remote IP/network service.\nAC:L - The attacker controls both sides of the race by concurrently closing the ISO-TP socket and unregistering the bound CAN device (e.g., vcan create/delete with CAP_NET_ADMIN in a user namespace), and can retry until the stale RX filter is left on a freed socket.\nPR:L - No init-namespace root is required: any local user can open CAN_ISOTP sockets, and CAP_NET_ADMIN obtainable in user namespaces suffices to create/delete vcan and drive the unregister path used in automotive/embedded ISO-TP (UDS) deployments.\nUI:N - No victim interaction is needed; the use-after-free is triggered by the attacker\u0027s own concurrent close()/NETDEV_UNREGISTER operations and subsequent CAN frames sent to the bound IDs.\nS:U - Impact is kernel heap corruption and potential privilege escalation within the same OS security boundary; it does not inherently cross VM, container, or IOMMU isolation boundaries.\nC:H - A stale can_rx filter keeps calling isotp_rcv()/isotp_rcv_echo() with a freed isotp_sock, enabling reads of reallocated slab contents through socket state, sock_queue_rcv_skb(), and protocol parsing on attacker-influenced memory.\nI:H - The UAF path performs extensive writes to freed socket state (RX/TX buffers, timers, generation counters) and can emit CAN traffic, providing primitives for heap shaping and control-flow hijack rather than a crash-only fault.\nA:H - Use-after-free in softirq CAN receive callbacks commonly causes kernel oops/panic from dereferencing or writing freed isotp_sock/timer state, even before reliable exploitation."
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    "datePublished": "2026-08-15T05:53:02.905Z",
    "dateReserved": "2026-08-09T03:40:39.907Z",
    "dateUpdated": "2026-10-16T18:44:57.938Z",
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The UAF path performs extensive writes to freed socket state (RX/TX buffers, timers, generation counters) and can emit CAN traffic, providing primitives for heap shaping and control-flow hijack rather than a crash-only fault.\\nA:H - Use-after-free in softirq CAN receive callbacks commonly causes kernel oops/panic from dereferencing or writing freed isotp_sock/timer state, even before reliable exploitation.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"e057dd3fc20ffb3d7f150af46542a51b59b90127\", \"lessThan\": \"f311bbb29bb06aaab69ba45a6e4b11323d20b8f9\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e057dd3fc20ffb3d7f150af46542a51b59b90127\", \"lessThan\": \"8e018f4335590460ebcf0c2b493ed38ba1a35204\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e057dd3fc20ffb3d7f150af46542a51b59b90127\", \"lessThan\": \"33b9cd9245e2a4b800f99ed1cc53d64960614152\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e057dd3fc20ffb3d7f150af46542a51b59b90127\", \"lessThan\": \"0b811c4bbe3ec9ad611e90a540fe8b51b3bb8a96\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e057dd3fc20ffb3d7f150af46542a51b59b90127\", \"lessThan\": \"43884dc7963beef2328f507f4fe680bdc173eb80\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e057dd3fc20ffb3d7f150af46542a51b59b90127\", \"lessThan\": \"7bef39ba76eb7307ed22a50329e0f5776dbeda58\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e057dd3fc20ffb3d7f150af46542a51b59b90127\", \"lessThan\": \"e442b62ba5a7756c17e05a77b32cdd085a2b6138\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"e057dd3fc20ffb3d7f150af46542a51b59b90127\", \"lessThan\": \"20bab8b88baac140ca3701116e1d486c7f51e311\", \"versionType\": \"git\"}], \"programFiles\": [\"net/can/isotp.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.10\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.10\", \"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\": \"6.18.40\", \"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/isotp.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/f311bbb29bb06aaab69ba45a6e4b11323d20b8f9\"}, {\"url\": \"https://git.kernel.org/stable/c/8e018f4335590460ebcf0c2b493ed38ba1a35204\"}, {\"url\": \"https://git.kernel.org/stable/c/33b9cd9245e2a4b800f99ed1cc53d64960614152\"}, {\"url\": \"https://git.kernel.org/stable/c/0b811c4bbe3ec9ad611e90a540fe8b51b3bb8a96\"}, {\"url\": \"https://git.kernel.org/stable/c/43884dc7963beef2328f507f4fe680bdc173eb80\"}, {\"url\": \"https://git.kernel.org/stable/c/7bef39ba76eb7307ed22a50329e0f5776dbeda58\"}, {\"url\": \"https://git.kernel.org/stable/c/e442b62ba5a7756c17e05a77b32cdd085a2b6138\"}, {\"url\": \"https://git.kernel.org/stable/c/20bab8b88baac140ca3701116e1d486c7f51e311\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\ncan: isotp: fix use-after-free race with concurrent NETDEV_UNREGISTER\\n\\nisotp_release() looked up the bound network device via dev_get_by_index()\\nusing the stored ifindex. During device unregistration the device is\\nunlisted from the ifindex hash before the NETDEV_UNREGISTER notifier\\nchain runs, so a concurrent isotp_release() could find no device, skip\\ncan_rx_unregister() entirely, and still proceed to free the socket.\\nSince isotp_release() had already removed itself from the isotp\\nnotifier list at that point, isotp_notify() would never get a chance to\\nclean up either, leaving a stale CAN filter that keeps pointing at the\\nfreed socket.\\n\\nFix this the same way raw.c already does: hold a tracked reference to\\nthe bound net_device in the socket (so-\u003edev/so-\u003edev_tracker) from\\nbind() onward instead of re-resolving it from the ifindex, and\\nserialize bind()/release() with rtnl_lock() so that so-\u003edev is always\\nconsistent with what the NETDEV_UNREGISTER notifier sees. so-\u003edev\\nstays valid regardless of ifindex-hash unlisting, and is only ever\\ncleared by whichever of isotp_release()/isotp_notify() gets there\\nfirst, so the filter is always removed exactly once.\\n\\nisotp_bind() now rejects a (re)bind with -EAGAIN while so-\u003e[tx|rx].state\\nisn\u0027t ISOTP_IDLE yet, so a timer left running by a prior\\nNETDEV_UNREGISTER can\u0027t act on a newly bound so-\u003eifindex. Both checks\\nshare the same lock_sock() section, so there is no window in which a\\nconcurrent isotp_notify() clearing so-\u003ebound could be missed.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.265\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.216\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.183\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.148\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.101\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.40\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.1.5\", \"versionStartIncluding\": \"5.10\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2\", \"versionStartIncluding\": \"5.10\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-19T16:36:23.877Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-72125\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-16T18:44:57.938Z\", \"dateReserved\": \"2026-08-09T03:40:39.907Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-08-15T05:53:02.905Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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