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CVE-2026-72322 (GCVE-0-2026-72322)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-08-17 05:42
VLAI
Title
ipv6: mcast: Fix potential UAF in MLD delayed work
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: mcast: Fix potential UAF in MLD delayed work A race condition exists between device teardown and incoming MLD query processing, leading to a Use-After-Free in the MLD delayed work. During device destruction, the primary reference to inet6_dev is dropped, which can drop its refcount to 0. The actual freeing of inet6_dev memory is deferred via RCU. Concurrently, the packet receive path runs under RCU read lock and obtains the inet6_dev pointer. Because the memory is RCU-protected, CPU-0 can safely dereference inet6_dev even if its refcount has hit 0. However, if CPU-0 calls igmp6_event_query() and schedules delayed work, it attempts to acquire a reference using in6_dev_hold(). This increments the refcount from 0 to 1, triggering a "refcount_t: addition on 0" warning. Since the inet6_dev memory is still scheduled to be freed after the RCU grace period, the device is freed while the work is still scheduled. When the work runs, it accesses the freed memory, causing a kernel panic. Fix this by using refcount_inc_not_zero() (via a new helper in6_dev_hold_safe()) to prevent acquiring a reference if the device is already being destroyed. If the refcount is 0, we do not schedule the work.
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: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f12b63ef26a035c5a29b3ef56401e38199010d4a (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0401d6cf7877c9be36652385dfcbf7f891b8b590 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < f03b0a45535d49bdab7e502efaacee205b2a7865 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9815e834f5ff8b39e0ea9f0dbd532f4a3b8f0785 (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ebbebf6cee950d7f1c81990256c0eae9e62572ae (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9ce741c22df4fd9546e30306317ac7df3607e48f (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 0458ba1cda830ba4ccfcd9e19c0891438bcdbe4e (git)
Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 9b26518b6896a16b809b1e42986f4ebac7bccc1e (git)
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Linux Linux Affected: 2.6.12
Unaffected: 0 , < 2.6.12 (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": "In the Linux kernel, the following vulnerability has been resolved:\n\nipv6: mcast: Fix potential UAF in MLD delayed work\n\nA race condition exists between device teardown and incoming MLD query\nprocessing, leading to a Use-After-Free in the MLD delayed work.\n\nDuring device destruction, the primary reference to inet6_dev is dropped,\nwhich can drop its refcount to 0. The actual freeing of inet6_dev memory\nis deferred via RCU.\n\nConcurrently, the packet receive path runs under RCU read lock and obtains\nthe inet6_dev pointer. Because the memory is RCU-protected, CPU-0 can\nsafely dereference inet6_dev even if its refcount has hit 0.\n\nHowever, if CPU-0 calls igmp6_event_query() and schedules delayed work, it\nattempts to acquire a reference using in6_dev_hold(). This increments the\nrefcount from 0 to 1, triggering a \"refcount_t: addition on 0\" warning.\nSince the inet6_dev memory is still scheduled to be freed after the RCU\ngrace period, the device is freed while the work is still scheduled.\nWhen the work runs, it accesses the freed memory, causing a kernel panic.\n\nFix this by using refcount_inc_not_zero() (via a new helper\nin6_dev_hold_safe()) to prevent acquiring a reference if the device is\nalready being destroyed. If the refcount is 0, we do not schedule the work."
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              "value": "AV:N - The flaw is reached from the IPv6 receive path when ICMPv6 MLD query/report packets are processed (icmpv6_rcv \u2192 igmp6_event_query/igmp6_event_report); igmp6_event_query queues work before link-local validation, so any remotely deliverable ICMPv6 MLD packet to an IPv6-enabled interface can hit the vulnerable code.\nAC:L - A race between incoming MLD traffic and inet6_dev teardown during unregister; an attacker can flood MLD packets and concurrently unregister/delete the interface (e.g., via CAP_NET_ADMIN in a user/network namespace), controlling both sides of the race to reliably trigger the UAF.\nPR:N - Triggering MLD processing requires no authentication or local account\u2014only the ability to send IPv6 ICMPv6 packets to the target; interface teardown can occur during routine operations (container stop, hot-unplug, reconfiguration) without attacker admin rights, and full control is also available with namespace CAP_NET_ADMIN (PR:L).\nUI:N - Exploitation requires no victim interaction beyond normal network operation; the attacker sends crafted or high-rate MLD traffic during interface teardown without the user opening files, clicking links, or performing any deliberate action.\nS:U - Impact is confined to kernel memory corruption and denial of service on the affected host; it does not cross a security boundary such as VM escape, container-to-host breakout, or IOMMU bypass\u2014standard kernel privilege context remains unchanged.\nC:H - Use-after-free of the inet6_dev structure after RCU reclamation allows an attacker to dereference and potentially reuse freed kernel heap memory, providing a path to arbitrary kernel memory disclosure through controlled object reuse and heap grooming.\nI:H - The UAF on inet6_dev and its embedded delayed-work structures enables heap spraying and corruption of kernel function pointers and data, creating a credible path to arbitrary kernel code execution and privilege escalation beyond a simple crash.\nA:H - When the scheduled MLD delayed work runs after inet6_dev is freed, the kernel accesses freed memory causing a use-after-free that the fix commit explicitly documents as leading to kernel panic, resulting in complete loss of system availability."
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Because the memory is RCU-protected, CPU-0 can\\nsafely dereference inet6_dev even if its refcount has hit 0.\\n\\nHowever, if CPU-0 calls igmp6_event_query() and schedules delayed work, it\\nattempts to acquire a reference using in6_dev_hold(). This increments the\\nrefcount from 0 to 1, triggering a \\\"refcount_t: addition on 0\\\" warning.\\nSince the inet6_dev memory is still scheduled to be freed after the RCU\\ngrace period, the device is freed while the work is still scheduled.\\nWhen the work runs, it accesses the freed memory, causing a kernel panic.\\n\\nFix this by using refcount_inc_not_zero() (via a new helper\\nin6_dev_hold_safe()) to prevent acquiring a reference if the device is\\nalready being destroyed. 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-18T23:43:25+00:00",
      "cve": "CVE-2026-72322",
      "id": "CVE-2026-72322",
      "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: mcast: Fix potential UAF in MLD delayed work",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72322.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.