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Appending those frags to another skb's\nfrags without fixing up the page refcount can lead to UAF.\n\nWhen either the last skb in the GRO chain (the one we would append\nfrags to) or the source skb is zerocopy, don't merge the skbs."}], "metrics": [{"cvssV3_1": {"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"}, "scenarios": [{"lang": "en", "value": "AV:L - Exploitation requires a local attacker to inject zerocopy/managed-frags skbs via io_uring SEND_ZC, TUN/TAP, or similar local APIs; ordinary remote wire packets processed by GRO do not carry SKBFL_MANAGED_FRAG_REFS, so a network-only attacker cannot reach the buggy merge path.\nAC:L - The attacker fully controls both sides of the GRO merge (seed and zerocopy TCP segments over a veth pair), timing (netem delay, RST race), and buffer setup; a public working LPE exploit exists, so success does not depend on conditions outside attacker control.\nPR:L - Triggering requires only a basic unprivileged local account with io_uring and user-namespace access (unshare -Urn), which is the default on many distributions; no init-namespace root or CAP_NET_ADMIN is needed.\nUI:N - No victim user action is required; the attacker drives the entire exploit autonomously through syscalls and local network namespace setup.\nS:U - Impact is standard host-kernel privilege escalation (root on the same kernel); it does not cross a distinct hypervisor/IOMMU security boundary such as VM-guest-to-host escape.\nC:H - The flaw is a use-after-free on page structures; the known exploit leverages the refcount underflow to obtain stale read access to freed physical pages and extract kernel PTE contents, enabling arbitrary memory disclosure primitives.\nI:H - UAF page refcount corruption enables crafting writable PTE entries against read-only page-cache pages; the public exploit demonstrates integrity compromise by rewriting /etc/passwd and obtaining root via su.\nA:H - 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Appending those frags to another skb's\nfrags without fixing up the page refcount can lead to UAF.\n\nWhen either the last skb in the GRO chain (the one we would append\nfrags to) or the source skb is zerocopy, don't merge the skbs."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nnet: gro: no fusionar skbs zcopy\n\nskb_gro_receive() actualmente puede copiar fragmentos entre el skb de origen y el GRO, sin verificar el estado de zerocopy, y en particular el indicador SKBFL_MANAGED_FRAG_REFS.\n\nCuando SKBFL_MANAGED_FRAG_REFS est\u00e1 establecido, el skb no mantiene una referencia en las p\u00e1ginas en shinfo->frags. Adjuntar esos fragmentos a los fragmentos de otro skb sin corregir el recuento de referencias de la p\u00e1gina puede llevar a UAF.\n\nCuando el \u00faltimo skb en la cadena GRO (aquel al que adjuntar\u00edamos fragmentos) o el skb de origen es zerocopy, no fusionar los skbs."}], "id": "CVE-2026-46323", "lastModified": "2026-10-15T02:19:53.923", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "LOW", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 1.8, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}, {"cvssData": {"attackComplexity": "LOW", "attackVector": "LOCAL", "availabilityImpact": "HIGH", "baseScore": 7.8, "baseSeverity": "HIGH", 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"416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Modified", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-123"}], "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c", "type": "Secondary"}]}

{}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[753f1ca4e1e50248a1b760c9774d6d6b354562cc,1f9c828556416fbe3f49386708ce999fc4d4da06)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[753f1ca4e1e50248a1b760c9774d6d6b354562cc,479084ae0e1d9cb7929cb4298d35623de189f80a)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[753f1ca4e1e50248a1b760c9774d6d6b354562cc,e334cbf3388fd9334503a778a82d9e9f14dd2f71)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[753f1ca4e1e50248a1b760c9774d6d6b354562cc,44bea2032af0425e4ce6d26a8af0ede79db49ec1)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[753f1ca4e1e50248a1b760c9774d6d6b354562cc,4db79a322db8c97f7b73b8a347395ef4d685eb40)"}}], "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": "6.0"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "generic", "value": "[0,6.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.142,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.92,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.34,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.0.11,7.1.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1-rc5,*]"}}], "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": "2026-06-09T14:00:06.845443+00:00", "updated": "2026-08-13T20:30:02.622455+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"]}