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CVE-2026-72125 (GCVE-0-2026-72125)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:53 – Updated: 2026-08-19 16:36
VLAI
Title
can: isotp: fix use-after-free race with concurrent NETDEV_UNREGISTER
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.
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: e057dd3fc20ffb3d7f150af46542a51b59b90127 , < f311bbb29bb06aaab69ba45a6e4b11323d20b8f9 (git)
Affected: e057dd3fc20ffb3d7f150af46542a51b59b90127 , < 8e018f4335590460ebcf0c2b493ed38ba1a35204 (git)
Affected: e057dd3fc20ffb3d7f150af46542a51b59b90127 , < 33b9cd9245e2a4b800f99ed1cc53d64960614152 (git)
Affected: e057dd3fc20ffb3d7f150af46542a51b59b90127 , < 0b811c4bbe3ec9ad611e90a540fe8b51b3bb8a96 (git)
Affected: e057dd3fc20ffb3d7f150af46542a51b59b90127 , < 43884dc7963beef2328f507f4fe680bdc173eb80 (git)
Affected: e057dd3fc20ffb3d7f150af46542a51b59b90127 , < 7bef39ba76eb7307ed22a50329e0f5776dbeda58 (git)
Affected: e057dd3fc20ffb3d7f150af46542a51b59b90127 , < e442b62ba5a7756c17e05a77b32cdd085a2b6138 (git)
Affected: e057dd3fc20ffb3d7f150af46542a51b59b90127 , < 20bab8b88baac140ca3701116e1d486c7f51e311 (git)
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Linux Linux Affected: 5.10
Unaffected: 0 , < 5.10 (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: 6.18.40 , ≤ 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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          "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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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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/can/isotp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/can/isotp.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"5.10\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.10\",\"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\":\"6.18.40\",\"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/0b811c4bbe3ec9ad611e90a540fe8b51b3bb8a96\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/20bab8b88baac140ca3701116e1d486c7f51e311\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/33b9cd9245e2a4b800f99ed1cc53d64960614152\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/43884dc7963beef2328f507f4fe680bdc173eb80\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/7bef39ba76eb7307ed22a50329e0f5776dbeda58\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8e018f4335590460ebcf0c2b493ed38ba1a35204\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e442b62ba5a7756c17e05a77b32cdd085a2b6138\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f311bbb29bb06aaab69ba45a6e4b11323d20b8f9\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T23:04:07+00:00",
      "cve": "CVE-2026-72125",
      "id": "CVE-2026-72125",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "184",
      "product_status:known_not_affected": "90",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: can: isotp: fix use-after-free race with concurrent NETDEV_UNREGISTER",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72125.json",
      "version": "3"
    }
  }
}



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Tags
Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • 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.