CVE-2026-80646 (GCVE-0-2026-80646)

Vulnerability from cvelistv5 – Published: 2026-08-28 06:48 – Updated: 2026-08-29 06:21
VLAI
Title
ipv6: guard against possible NULL deref in __in6_dev_stats_get()
Summary
In the Linux kernel, the following vulnerability has been resolved: ipv6: guard against possible NULL deref in __in6_dev_stats_get() dev_get_by_index_rcu() could return NULL if the original physical device is unregistered. Found by Sashiko.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f , < a23f2c68c6635e41404f189f8f7ae910738cebdb (git)
Affected: e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f , < e14db43677946bf2095febd294bb3c13ab375ab7 (git)
Affected: e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f , < 1a4adfbeb47a212a64539137411f1ca168474d33 (git)
Affected: e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f , < 1e3db30a88815bae6e9d5db6f64ac735e615a07e (git)
Affected: e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f , < 952426a83ca75cea25c09d58944abafaa3ebd242 (git)
Affected: e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f , < 0db1949084e85a72d174a7dea3259b94fe5a9305 (git)
Affected: e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f , < fc920c0659cdea5afd8721c1155a51564859e075 (git)
Affected: e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f , < 507541c2a8eeb76c02bd2511958f73a8cfa3e1bc (git)
Affected: a24963500a4ec921ce9c2597e0a584e44513afae (git)
Affected: 4.19.291 , < 4.20 (semver)
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Linux Linux Affected: 5.2
Unaffected: 0 , < 5.2 (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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            "version": "3.1"
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              "value": "AV:N - Remote attackers reach ipv6_frag_rcv() through the standard IPv6 receive and local-delivery path (ipv6_rcv to ip6_protocol_deliver_rcu) by sending fragmented IPv6 packets to an Internet-facing host running IPv6 reassembly on a VRF/L3-master ingress path.\nAC:L - An attacker can repeatedly deliver IPv6 fragments and time them against concurrent netdev unregister (link teardown, container veth removal, or ip link del with CAP_NET_ADMIN in a user namespace), controlling both sides of the race rather than depending on uncontrollable layout.\nPR:N - Sending unauthenticated IPv6 fragments requires no kernel credentials; VRF/L3-master configuration is a deployment condition on routers and cloud hosts, not a privilege the attacker must hold to deliver the triggering traffic.\nUI:N - Exploitation needs only network delivery of fragmented IPv6 packets during interface teardown; no victim action such as opening files, clicking links, or mounting filesystems is required.\nS:U - The NULL dereference crashes the kernel on the receiving host but does not cross a VM, container, or IOMMU security boundary; impact stays within the same kernel security authority.\nC:N - The failure is a NULL pointer read in __in6_dev_get(NULL) after dev_get_by_index_rcu() returns NULL; there is no use-after-free, out-of-bounds read, or other information-disclosure primitive.\nI:N - The bug dereferences a NULL net_device pointer for statistics lookup only; it provides no memory write, corruption, or control-flow hijack primitive beyond crashing the kernel.\nA:H - The NULL dereference during IPv6 fragment receive/reassembly processing in softirq context causes a kernel OOPS or panic, fully denying availability on the affected system until reboot."
            }
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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    "dateReserved": "2026-08-26T14:34:25.779Z",
    "dateUpdated": "2026-08-29T06:21:41.550Z",
    "state": "PUBLISHED"
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      "date": "2026-09-01",
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-01T12:37:00+00:00",
      "cve": "CVE-2026-80646",
      "id": "CVE-2026-80646",
      "initial_release_date": "2026-08-28T00:00:00+00:00",
      "product_status:known_affected": "198",
      "product_status:known_not_affected": "76",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ipv6: guard against possible NULL deref in __in6_dev_stats_get()",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-80646.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

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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.