CVE-2026-80646

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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."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["include/net/addrconf.h"], "versions": [{"version": 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vulnerability has been resolved:\n\nipv6: guard against possible NULL deref in __in6_dev_stats_get()\n\ndev_get_by_index_rcu() could return NULL if the original physical\ndevice is unregistered.\n\nFound by Sashiko."}], "id": "CVE-2026-80646", "lastModified": "2026-10-16T20:18:05.000", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "NONE", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-80646", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "partial"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:19:19.200610Z", "version": "2.0.3"}}]}, "published": "2026-08-28T08:16:49.550", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0db1949084e85a72d174a7dea3259b94fe5a9305"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1a4adfbeb47a212a64539137411f1ca168474d33"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1e3db30a88815bae6e9d5db6f64ac735e615a07e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/507541c2a8eeb76c02bd2511958f73a8cfa3e1bc"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/952426a83ca75cea25c09d58944abafaa3ebd242"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/a23f2c68c6635e41404f189f8f7ae910738cebdb"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e14db43677946bf2095febd294bb3c13ab375ab7"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fc920c0659cdea5afd8721c1155a51564859e075"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ipv6: guard against possible NULL deref in __in6_dev_stats_get()", "id": "2525456", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2525456"}, "csaw": false, "cvss3": {"cvss3_base_score": "5.5", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H", "status": "draft"}, "cwe": "CWE-476", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nipv6: guard against possible NULL deref in __in6_dev_stats_get()\ndev_get_by_index_rcu() could return NULL if the original physical\ndevice is unregistered.\nFound by Sashiko.", "A flaw was found in the Linux kernel's IPv6 component. This vulnerability arises when the `dev_get_by_index_rcu()` function returns a null value if the original physical device is unregistered, leading to a NULL pointer dereference in `__in6_dev_stats_get()`. A local attacker could exploit this flaw to trigger a system crash, resulting in a Denial of Service (DoS)."], "name": "CVE-2026-80646", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Out of support scope", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Not affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Fix deferred", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-08-28T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-80646\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-80646\nhttps://lore.kernel.org/linux-cve-announce/2026082842-CVE-2026-80646-2d23@gregkh/T"], "threat_severity": "Moderate"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f,a23f2c68c6635e41404f189f8f7ae910738cebdb)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f,e14db43677946bf2095febd294bb3c13ab375ab7)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f,1a4adfbeb47a212a64539137411f1ca168474d33)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f,1e3db30a88815bae6e9d5db6f64ac735e615a07e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f,952426a83ca75cea25c09d58944abafaa3ebd242)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f,0db1949084e85a72d174a7dea3259b94fe5a9305)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f,fc920c0659cdea5afd8721c1155a51564859e075)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e1ae5c2ea4783b1fd87be250f9fcc9d9e1a6ba3f,507541c2a8eeb76c02bd2511958f73a8cfa3e1bc)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "a24963500a4ec921ce9c2597e0a584e44513afae"}}, {"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "[4.19.291,4.20)"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}, {"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "generic", "value": "5.2"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,5.2)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.10.261,5.10.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[5.15.212,5.15.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.1.178,6.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.6.145,6.6.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.12.97,6.12.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[6.18.40,6.18.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[7.1.5,7.1.*]"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,*]"}}], "enrichment": {"confidence": 99.0, "confidence_source": "inferred", "scores": [{"score": 99.0, "source": "inferred"}, {"score": 100.0, "source": "matching"}]}, "original": {"product": "Linux", "source": "cna", "vendor": "Linux"}, "product": "linux_kernel", "vendor": "linux"}], "created": "2026-08-28T11:15:03.331741+00:00", "updated": "2026-08-29T10:30:08.643139+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-476"]}