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CVE-2026-72126 (GCVE-0-2026-72126)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:53 – Updated: 2026-08-17 05:40
VLAI
Title
can: isotp: use unconditional synchronize_rcu() in isotp_release()
Summary
In the Linux kernel, the following vulnerability has been resolved: can: isotp: use unconditional synchronize_rcu() in isotp_release() isotp_notify() unregisters the (RCU) CAN filters via can_rx_unregister() and clears so->bound without waiting for a grace period. isotp_release() uses so->bound to decide whether it needs to call synchronize_rcu() before cancelling so->rxtimer, so when NETDEV_UNREGISTER runs first it skips that synchronize_rcu() and can cancel the timer while an in-flight isotp_rcv() is still executing and about to re-arm it via isotp_send_fc(), leading to a use-after-free timer callback on the freed socket. sakisho-bot remarked a problem with rtnl_lock held in isotp_notify(), therefore make isotp_release() always call synchronize_rcu() before cancelling the timers, regardless of so->bound. This still closes the original race (isotp_notify() clearing so->bound without waiting for in-flight isotp_rcv() callers before isotp_release() cancels the RX timer) without adding any RCU wait to the netdevice notifier path.
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: 22bfa94db2ef6900c790884fa9461486516626e9 , < 945d9894502cd9124f5d676181c542ed2000f7c0 (git)
Affected: 14a4696bc3118ba49da28f79280e1d55603aa737 , < 59672aa4bcd8d32172c1ff6a179583981d6acabc (git)
Affected: 14a4696bc3118ba49da28f79280e1d55603aa737 , < 15413a082df69175c2f96aeab4c26fe1ff7cff03 (git)
Affected: 14a4696bc3118ba49da28f79280e1d55603aa737 , < 6280eda96e0707264849fa7d036fed873c1f8a6d (git)
Affected: 14a4696bc3118ba49da28f79280e1d55603aa737 , < cb6abc584a1bfab107ac003d64948a4aef1730aa (git)
Affected: 14a4696bc3118ba49da28f79280e1d55603aa737 , < b88a511308779c225005d7994b8744561bdbafbc (git)
Affected: 14a4696bc3118ba49da28f79280e1d55603aa737 , < b8278ff605187ef3fa0f2705e93251cce4c4f8ee (git)
Affected: 14a4696bc3118ba49da28f79280e1d55603aa737 , < 9b1a02e0d980ac6b0e36a90378f847062f81d7e4 (git)
Affected: 80c6ddf771df2ef786f28c1ca5919b3f1080091b (git)
Affected: ebf91625b3e404bd2b4b694c7ee71c1e8f8bd08f (git)
Affected: 5.10.50 , < 5.10.261 (semver)
Affected: 5.12.17 , < 5.13 (semver)
Affected: 5.13.2 , < 5.14 (semver)
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Linux Linux Affected: 5.14
Unaffected: 0 , < 5.14 (semver)
Unaffected: 5.10.261 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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              "value": "AV:L - The UAF is reached through local AF_CAN CAN_ISOTP socket syscalls (socket/bind/close) racing in-kernel ISO-TP RX; a CAN peer can deliver frames, but exploitation requires a local process to close the socket while NETDEV_UNREGISTER clears so-\u003ebound.\nAC:L - The attacker controls all race sides: ISO-TP RX traffic via a local CAN socket or bus peer, concurrent close() on the ISOTP socket, and NETDEV_UNREGISTER by deleting the bound vcan/CAN interface (e.g., in a user namespace with CAP_NET_ADMIN).\nPR:L - CAN_ISOTP socket create/bind/sendmsg/close paths impose no CAP_NET_ADMIN check; an unprivileged local user with access to a CAN netdev, including a user-namespace vcan they create, can reach the vulnerable release/timer path.\nUI:N - No victim interaction is required once the attacker can execute local code; they can open the ISO-TP socket, drive RX via CAN frames, delete the netdev, and close the socket to race isotp_rcv() against isotp_release().\nS:U - Exploitation corrupts kernel heap memory within the same OS security boundary (standard kernel UAF), not a VM/host or IOMMU sandbox escape.\nC:H - Use-after-free of struct isotp_sock in isotp_rx_timer_handler reads freed memory (so-\u003erx.state, sock fields), enabling heap grooming for arbitrary kernel memory disclosure per conservative UAF scoring guidance.\nI:H - The timer callback performs writes to fields within the freed isotp_sock/socket object, giving attacker-influenced kernel heap corruption that can be developed into arbitrary write or privilege-escalation primitives.\nA:H - Executing isotp_rx_timer_handler on a freed socket can cause kernel oops/panic or fatal memory corruption; the UAF is reliably triggerable with attacker-controlled timing."
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    "dateReserved": "2026-08-09T03:40:39.907Z",
    "dateUpdated": "2026-08-17T05:40:40.020Z",
    "state": "PUBLISHED"
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This still closes the\\noriginal race (isotp_notify() clearing so-\u003ebound without waiting for\\nin-flight isotp_rcv() callers before isotp_release() cancels the RX\\ntimer) without adding any RCU wait to the netdevice notifier path.\"}],\"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\":\"22bfa94db2ef6900c790884fa9461486516626e9\",\"lessThan\":\"945d9894502cd9124f5d676181c542ed2000f7c0\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"14a4696bc3118ba49da28f79280e1d55603aa737\",\"lessThan\":\"59672aa4bcd8d32172c1ff6a179583981d6acabc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"14a4696bc3118ba49da28f79280e1d55603aa737\",\"lessThan\":\"15413a082df69175c2f96aeab4c26fe1ff7cff03\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"14a4696bc3118ba49da28f79280e1d55603aa737\",\"lessThan\":\"6280eda96e0707264849fa7d036fed873c1f8a6d\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"14a4696bc3118ba49da28f79280e1d55603aa737\",\"lessThan\":\"cb6abc584a1bfab107ac003d64948a4aef1730aa\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"14a4696bc3118ba49da28f79280e1d55603aa737\",\"lessThan\":\"b88a511308779c225005d7994b8744561bdbafbc\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"14a4696bc3118ba49da28f79280e1d55603aa737\",\"lessThan\":\"b8278ff605187ef3fa0f2705e93251cce4c4f8ee\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"14a4696bc3118ba49da28f79280e1d55603aa737\",\"lessThan\":\"9b1a02e0d980ac6b0e36a90378f847062f81d7e4\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"80c6ddf771df2ef786f28c1ca5919b3f1080091b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"ebf91625b3e404bd2b4b694c7ee71c1e8f8bd08f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"5.10.50\",\"lessThan\":\"5.10.261\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.12.17\",\"lessThan\":\"5.13\",\"versionType\":\"semver\",\"status\":\"affected\"},{\"version\":\"5.13.2\",\"lessThan\":\"5.14\",\"versionType\":\"semver\",\"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\":\"5.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"5.14\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.261\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"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/15413a082df69175c2f96aeab4c26fe1ff7cff03\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/59672aa4bcd8d32172c1ff6a179583981d6acabc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6280eda96e0707264849fa7d036fed873c1f8a6d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/945d9894502cd9124f5d676181c542ed2000f7c0\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9b1a02e0d980ac6b0e36a90378f847062f81d7e4\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b8278ff605187ef3fa0f2705e93251cce4c4f8ee\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b88a511308779c225005d7994b8744561bdbafbc\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/cb6abc584a1bfab107ac003d64948a4aef1730aa\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-17T23:09:23+00:00",
      "cve": "CVE-2026-72126",
      "id": "CVE-2026-72126",
      "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: use unconditional synchronize_rcu() in isotp_release()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72126.json",
      "version": "3"
    }
  }
}



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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.