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CVE-2026-74398 (GCVE-0-2026-74398)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-17 05:46
VLAI
Title
ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD addrconf_dad_failure() transitions ifp->state from DAD to POSTDAD via addrconf_dad_end(), which drops ifp->lock on return. The lock is re-acquired after net_info_ratelimited(). A concurrent ipv6_del_addr() can take the lock in that window, set ifp->state to DEAD and run list_del_rcu(&ifp->if_list). addrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad: and schedules a new dad_work. The work calls ipv6_del_addr() again, hitting the already-poisoned list entry: general protection fault: 0000 [#1] SMP NOPTI CPU: 4 PID: 217 Comm: kworker/4:1 Workqueue: ipv6_addrconf addrconf_dad_work RIP: 0010:ipv6_del_addr+0xe9/0x280 RAX: dead000000000122 Call Trace: addrconf_dad_stop+0x113/0x140 addrconf_dad_work+0x28c/0x430 process_one_work+0x1eb/0x3b0 worker_thread+0x4d/0x400 kthread+0x104/0x140 ret_from_fork+0x35/0x40 Fold the addrconf_dad_end() logic into addrconf_dad_failure() under a single ifp->lock critical section. The STABLE_PRIVACY branch temporarily drops ifp->lock around address regeneration, so at lock_errdad: verify the state is still POSTDAD before transitioning to ERRDAD; bail out otherwise to avoid overwriting a state set by another path while the lock was released.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c15b1ccadb323ea50023e8f1cca2954129a62b51 , < 47b05836705b63dab93d9ac7c69a3a507375ef80 (git)
Affected: c15b1ccadb323ea50023e8f1cca2954129a62b51 , < d21be7d051012c6b572fa4e3334443c250216f7b (git)
Affected: c15b1ccadb323ea50023e8f1cca2954129a62b51 , < 875c284c0f98b042bb97abad460f63a24c977f88 (git)
Affected: c15b1ccadb323ea50023e8f1cca2954129a62b51 , < 8ed0ce9ea58d677d1bac92614ee5f60f8ea57363 (git)
Affected: c15b1ccadb323ea50023e8f1cca2954129a62b51 , < 3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb (git)
Affected: c15b1ccadb323ea50023e8f1cca2954129a62b51 , < b61af0268e3d1308c466bf0be5dced844eafc1ef (git)
Affected: c15b1ccadb323ea50023e8f1cca2954129a62b51 , < e889aa99ad3ed48bb0ddcff6475b17542532d18b (git)
Affected: c15b1ccadb323ea50023e8f1cca2954129a62b51 , < 627ac78f2741e2ebd2225e2e953b6964a8a9182f (git)
Affected: 835b474b8f70fa68d68abffad37378e92f661802 (git)
Affected: 3.10.105 , < 3.11 (semver)
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Linux Linux Affected: 3.14
Unaffected: 0 , < 3.14 (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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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD\n\naddrconf_dad_failure() transitions ifp-\u003estate from DAD to POSTDAD\nvia addrconf_dad_end(), which drops ifp-\u003elock on return.  The lock\nis re-acquired after net_info_ratelimited().  A concurrent\nipv6_del_addr() can take the lock in that window, set ifp-\u003estate\nto DEAD and run list_del_rcu(\u0026ifp-\u003eif_list).\n\naddrconf_dad_failure() then overwrites DEAD with ERRDAD at errdad:\nand schedules a new dad_work.  The work calls ipv6_del_addr()\nagain, hitting the already-poisoned list entry:\n\n  general protection fault: 0000 [#1] SMP NOPTI\n  CPU: 4 PID: 217 Comm: kworker/4:1\n  Workqueue: ipv6_addrconf addrconf_dad_work\n  RIP: 0010:ipv6_del_addr+0xe9/0x280\n  RAX: dead000000000122\n  Call Trace:\n   addrconf_dad_stop+0x113/0x140\n   addrconf_dad_work+0x28c/0x430\n   process_one_work+0x1eb/0x3b0\n   worker_thread+0x4d/0x400\n   kthread+0x104/0x140\n   ret_from_fork+0x35/0x40\n\nFold the addrconf_dad_end() logic into addrconf_dad_failure() under\na single ifp-\u003elock critical section.  The STABLE_PRIVACY branch\ntemporarily drops ifp-\u003elock around address regeneration, so at\nlock_errdad: verify the state is still POSTDAD before transitioning\nto ERRDAD; bail out otherwise to avoid overwriting a state set by\nanother path while the lock was released."
        }
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      "metrics": [
        {
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            "baseSeverity": "CRITICAL",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
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              "value": "AV:N - The bug is reached from inbound ICMPv6 Neighbor Discovery (NS/NA) packets processed by icmp6_rcv()\u2192ndisc_rcv()\u2192addrconf_dad_failure(), the standard IPv6 network receive path on internet-facing servers, cloud VMs, phones, and IoT devices on shared L2 segments.\nAC:L - An attacker controls both sides of the race by flooding forged NS/NA during DAD while concurrently triggering ipv6_del_addr() via RTM_DELADDR/CAP_NET_ADMIN in a user namespace, CNI/orchestration address teardown, or interface-down processing; retries make the narrow window reliably winnable.\nPR:N - Triggering DAD failure requires only unauthenticated ND packet injection on the victim\u0027s link; the concurrent ipv6_del_addr() leg needs no victim credentials and can come from automatic address lifecycle events (CNI churn, SLAAC/privacy regeneration, netdev down) rather than attacker admin rights.\nUI:N - Exploitation does not require any victim user action such as opening files or mounting filesystems; it targets automatic IPv6 address configuration and DAD processing that occurs during normal network connectivity and boot.\nS:U - The corrupted inet6_ifaddr lifecycle and resulting kernel crash occur within kernel memory management; impact does not cross a VM, container, or IOMMU security boundary into a separate authority.\nC:H - The race leaves a freed/partially torn-down inet6_ifaddr with corrupted state and a poisoned RCU list entry (LIST_POISON2), constituting use-after-free class memory corruption that can expose adjacent kernel heap contents beyond a pure crash.\nI:H - Corrupting inet6_ifaddr state after list_del_rcu() and re-queuing dad_work on a dead object enables heap reuse and control of freed object contents, providing a path to arbitrary kernel memory writes and potential code execution beyond denial of service.\nA:H - The demonstrated failure is a general protection fault in ipv6_del_addr() from addrconf_dad_work on the ipv6_addrconf workqueue, causing a kernel oops/panic and complete loss of system availability on affected hosts."
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        "dateUpdated": "2026-08-17T05:46:43.132Z",
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        "shortName": "Linux"
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      "title": "ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-74398",
    "datePublished": "2026-08-15T05:59:10.113Z",
    "dateReserved": "2026-08-15T05:44:03.891Z",
    "dateUpdated": "2026-08-17T05:46:43.132Z",
    "state": "PUBLISHED"
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      "date": "2026-09-04",
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The work calls ipv6_del_addr()\\nagain, hitting the already-poisoned list entry:\\n\\n  general protection fault: 0000 [#1] SMP NOPTI\\n  CPU: 4 PID: 217 Comm: kworker/4:1\\n  Workqueue: ipv6_addrconf addrconf_dad_work\\n  RIP: 0010:ipv6_del_addr+0xe9/0x280\\n  RAX: dead000000000122\\n  Call Trace:\\n   addrconf_dad_stop+0x113/0x140\\n   addrconf_dad_work+0x28c/0x430\\n   process_one_work+0x1eb/0x3b0\\n   worker_thread+0x4d/0x400\\n   kthread+0x104/0x140\\n   ret_from_fork+0x35/0x40\\n\\nFold the addrconf_dad_end() logic into addrconf_dad_failure() under\\na single ifp-\u003elock critical section.  The STABLE_PRIVACY branch\\ntemporarily drops ifp-\u003elock around address regeneration, so at\\nlock_errdad: verify the state is still POSTDAD before transitioning\\nto ERRDAD; bail out otherwise to avoid overwriting a state set by\\nanother path while the lock was released.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/ipv6/addrconf.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"c15b1ccadb323ea50023e8f1cca2954129a62b51\",\"lessThan\":\"47b05836705b63dab93d9ac7c69a3a507375ef80\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c15b1ccadb323ea50023e8f1cca2954129a62b51\",\"lessThan\":\"d21be7d051012c6b572fa4e3334443c250216f7b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c15b1ccadb323ea50023e8f1cca2954129a62b51\",\"lessThan\":\"875c284c0f98b042bb97abad460f63a24c977f88\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c15b1ccadb323ea50023e8f1cca2954129a62b51\",\"lessThan\":\"8ed0ce9ea58d677d1bac92614ee5f60f8ea57363\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c15b1ccadb323ea50023e8f1cca2954129a62b51\",\"lessThan\":\"3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c15b1ccadb323ea50023e8f1cca2954129a62b51\",\"lessThan\":\"b61af0268e3d1308c466bf0be5dced844eafc1ef\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c15b1ccadb323ea50023e8f1cca2954129a62b51\",\"lessThan\":\"e889aa99ad3ed48bb0ddcff6475b17542532d18b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c15b1ccadb323ea50023e8f1cca2954129a62b51\",\"lessThan\":\"627ac78f2741e2ebd2225e2e953b6964a8a9182f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"835b474b8f70fa68d68abffad37378e92f661802\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"3.10.105\",\"lessThan\":\"3.11\",\"versionType\":\"semver\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/ipv6/addrconf.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"3.14\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"3.14\",\"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:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/3bdc86d89fd6c6523753fa6f42fcfaf30ee699cb\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/47b05836705b63dab93d9ac7c69a3a507375ef80\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/627ac78f2741e2ebd2225e2e953b6964a8a9182f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/875c284c0f98b042bb97abad460f63a24c977f88\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/8ed0ce9ea58d677d1bac92614ee5f60f8ea57363\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b61af0268e3d1308c466bf0be5dced844eafc1ef\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d21be7d051012c6b572fa4e3334443c250216f7b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/e889aa99ad3ed48bb0ddcff6475b17542532d18b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-20T22:19:27+00:00",
      "cve": "CVE-2026-74398",
      "id": "CVE-2026-74398",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipv6: addrconf: bail out of dad_failure when state is no longer POSTDAD",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74398.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.