CVE-2026-63924

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"value": "AV:N - The bug is in the IPv6 input path (ipv6_rcv \u2192 ip6_rcv_core \u2192 ipv6_parse_hopopts) triggered by a crafted IPv6 packet with hop-by-hop options containing a Jumbo Payload TLV, reachable from any remote peer that can deliver IPv6 to the host.\nAC:L - An attacker fully controls the crafted IPv6 packet (HBH layout, jumbo length, trailing TLVs) and can send it repeatedly; once the skb is cloned/shared during receive and pskb_trim_rcsum reallocates the head, the stale-pointer UAF is deterministically triggered without races or victim-specific state.\nPR:N - No authentication or local privileges are required; any unauthenticated remote host that can send IPv6 traffic to a listening interface reaches the vulnerable receive handler with no capability or namespace checks along the path.\nUI:N - Exploitation requires only delivery of a malicious IPv6 packet and does not depend on any victim user action such as opening files, clicking links, or mounting filesystems.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same kernel security domain; it does not cross a VM, container, or IOMMU boundary by itself.\nC:H - Continued HBH TLV parsing through the stale nh pointer is a use-after-free read of freed skb head memory, which per kernel guidance enables arbitrary kernel memory disclosure when the freed slab is reused.\nI:H - Stale-pointer UAF during TLV length/type parsing can yield unbounded out-of-bounds reads and corrupt subsequent parsing state, providing memory corruption primitives that can be developed into arbitrary kernel writes or code execution.\nA:H - Dereferencing the freed network-header pointer during TLV parsing can cause immediate kernel oops/panic from invalid memory access, and UAF-triggered parsing errors reliably drop or crash the receive path."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": 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ipv6_parse_hopopts) triggered by a crafted IPv6 packet with hop-by-hop options containing a Jumbo Payload TLV, reachable from any remote peer that can deliver IPv6 to the host.\nAC:L - An attacker fully controls the crafted IPv6 packet (HBH layout, jumbo length, trailing TLVs) and can send it repeatedly; once the skb is cloned/shared during receive and pskb_trim_rcsum reallocates the head, the stale-pointer UAF is deterministically triggered without races or victim-specific state.\nPR:N - No authentication or local privileges are required; any unauthenticated remote host that can send IPv6 traffic to a listening interface reaches the vulnerable receive handler with no capability or namespace checks along the path.\nUI:N - Exploitation requires only delivery of a malicious IPv6 packet and does not depend on any victim user action such as opening files, clicking links, or mounting filesystems.\nS:U - Impact is confined to kernel memory corruption and privilege escalation within the same kernel security domain; it does not cross a VM, container, or IOMMU boundary by itself.\nC:H - Continued HBH TLV parsing through the stale nh pointer is a use-after-free read of freed skb head memory, which per kernel guidance enables arbitrary kernel memory disclosure when the freed slab is reused.\nI:H - Stale-pointer UAF during TLV length/type parsing can yield unbounded out-of-bounds reads and corrupt subsequent parsing state, providing memory corruption primitives that can be developed into arbitrary kernel writes or code execution.\nA:H - Dereferencing the freed network-header pointer during TLV parsing can cause immediate kernel oops/panic from invalid memory access, and UAF-triggered parsing errors reliably drop or crash the receive path."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "1da177e4c3f41524e886b7f1b8a0c1fc7321cac2", "lessThan": 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skb pointers.\nLet's recompute nh pointer to make sure any change won't mess things up."}], "id": "CVE-2026-63924", "lastModified": "2026-10-22T15:20:12.383", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "HIGH", "baseScore": 9.8, "baseSeverity": "CRITICAL", "confidentialityImpact": "HIGH", "integrityImpact": "HIGH", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 5.9, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}], "ssvcV203": [{"source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "ssvcData": {"id": "CVE-2026-63924", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T15:33:33.023391Z", "version": "2.0.3"}}]}, "published": 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"416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/c512e1c819dfbf6ae95ee7a44b65b9ad98979157"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "tags": ["Patch"], "url": "https://git.kernel.org/stable/c/d47548a36639095939f4747d4c43f2271366f565"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Analyzed", "weaknesses": [{"description": [{"lang": "en", "value": "CWE-416"}], "source": "nvd@nist.gov", "type": "Primary"}, {"description": [{"lang": "en", "value": "CWE-822"}], "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "type": "Secondary"}]}

{"bugzilla": {"description": "kernel: ipv6: exthdrs: refresh nh pointer after ipv6_hop_jumbo()", "id": "2502326", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2502326"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-825", "details": ["A flaw was found in the Linux kernel's handling of IPv6 extended headers. Specifically, the `ipv6_hop_jumbo()` function, which processes jumbo payloads, can modify internal packet buffer (skb) pointers. However, the network header (nh) pointer is not recomputed after these modifications. This oversight could lead to incorrect data processing, potentially causing system instability or a denial of service (DoS) due to malformed packets."], "name": "CVE-2026-63924", "package_state": [{"cpe": "cpe:/o:redhat:enterprise_linux:10", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 10"}, {"cpe": "cpe:/o:redhat:enterprise_linux:6", "fix_state": "Under investigation", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 6"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:7", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 7"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:8", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 8"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel", "product_name": "Red Hat Enterprise Linux 9"}, {"cpe": "cpe:/o:redhat:enterprise_linux:9", "fix_state": "Affected", "package_name": "kernel-rt", "product_name": "Red Hat Enterprise Linux 9"}], "public_date": "2026-07-19T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-63924\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-63924\nhttps://lore.kernel.org/linux-cve-announce/2026071948-CVE-2026-63924-ec60@gregkh/T"], "threat_severity": "Important"}

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