CVE-2026-74597

{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74597", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.919Z", "datePublished": "2026-08-22T15:31:47.120Z", "dateUpdated": "2026-10-16T19:06:00.036Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:40:23.709Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6_tunnel: clear skb2->cb[] in ip6ip6_err()\n\nip6ip6_err() clones an outer IPv6 ICMP error skb, pulls it to the\nquoted inner IPv6 packet, and then passes the clone to icmpv6_send().\nThe clone still carries the outer packet's inet6_skb_parm in skb->cb.\n\nIf the outer packet had a Home Address Option, IP6CB(skb2)->dsthao\nremains non-zero after skb_pull(). icmpv6_send() later calls\nmip6_addr_swap(), which uses that stale dsthao offset against the quoted\ninner packet. A malformed inner destination-options header can then make\nthe HAO lookup and address swap run past the end of the quoted packet\nand corrupt skb_shared_info.\n\nClear skb2->cb[] before pulling the quoted inner IPv6 packet so the\nreply path does not reuse metadata left by the outer IPv6 stack."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H", "baseScore": 9.8, "baseSeverity": "CRITICAL"}, "scenarios": [{"lang": "en", "value": "AV:N - The bug is reached when a remote peer sends a forged ICMPv6 error whose quoted payload is an IPv6-in-IPv6 tunnel datagram; processing follows the normal IPv6 receive path (ipv6_rcv -> icmpv6_notify -> tunnel6_err -> ip6ip6_err) with no local access required.\nAC:L - The attacker controls the carrier IPv6 Home Address Option, quoted tunnel/inner headers, and ICMP error type; once an ip6tnl endpoint exists (normal for this subsystem), triggering the stale-dsthao path is reliable and needs no races or victim interaction.\nPR:N - No authentication or capabilities are required on the target; unprivileged remote senders can deliver crafted ICMPv6 errors that the kernel processes on the standard pre-auth receive path (INET6_PROTO_NOPOLICY).\nUI:N - Exploitation requires only delivering a malicious network packet; no victim must open files, click links, or perform any other action.\nS:U - Impact is in-kernel memory corruption on the receiving host within the same security authority; it does not by itself cross VM, container, or IOMMU boundaries.\nC:H - With CONFIG_IPV6_MIP6, mip6_addr_swap() uses the stale dsthao offset to scan the quoted inner packet and can read attacker-controlled bytes past the skb tail while resolving a fake HAO TLV before swapping addresses.\nI:H - The resulting 16-byte swap(iph->saddr, hao->addr) can write beyond the quoted packet into skb_shared_info, giving attacker-influenced heap corruption suitable for further control-flow or data manipulation.\nA:H - Corrupting skb_shared_info from the network input path can cause kernel oops/panic or otherwise deny service on IPv6 tunnel endpoints, and the condition is repeatable with crafted packets."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/ip6_tunnel.c"], "versions": [{"version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "lessThan": "44fe898df302e91c5ee5acbc71ffa74e78e6c183", "status": "affected", "versionType": "git"}, {"version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "lessThan": "0dadb0620ab65949a8bc2439dd28ea3c942fe87d", "status": "affected", "versionType": "git"}, {"version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "lessThan": "b6816536a2990c0db44a26130a03e40b441e829b", "status": "affected", "versionType": "git"}, {"version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "lessThan": "64e41736a26f37ab6215bc2e6df125df05aceb08", "status": "affected", "versionType": "git"}, {"version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "lessThan": "484134e1eb07d700a73b1e4bbf3fb503e299be60", "status": "affected", "versionType": "git"}, {"version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "lessThan": "4eb15c465337b18f44716c499cd6ad63eee0ad54", "status": "affected", "versionType": "git"}, {"version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "lessThan": "fbf40faa0414b753212494ad197542002e66ed9e", "status": "affected", "versionType": "git"}, {"version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "lessThan": "f803c086399da277b5d0ff36a107d0f162751800", "status": "affected", "versionType": "git"}]}, {"product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/ipv6/ip6_tunnel.c"], "versions": [{"version": "2.6.22", "status": "affected"}, {"version": "0", "lessThan": "2.6.22", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.152", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.104", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.45", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.9", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "5.10.265"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.6.152"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.12.104"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.22", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/44fe898df302e91c5ee5acbc71ffa74e78e6c183"}, {"url": "https://git.kernel.org/stable/c/0dadb0620ab65949a8bc2439dd28ea3c942fe87d"}, {"url": "https://git.kernel.org/stable/c/b6816536a2990c0db44a26130a03e40b441e829b"}, {"url": "https://git.kernel.org/stable/c/64e41736a26f37ab6215bc2e6df125df05aceb08"}, {"url": "https://git.kernel.org/stable/c/484134e1eb07d700a73b1e4bbf3fb503e299be60"}, {"url": "https://git.kernel.org/stable/c/4eb15c465337b18f44716c499cd6ad63eee0ad54"}, {"url": "https://git.kernel.org/stable/c/fbf40faa0414b753212494ad197542002e66ed9e"}, {"url": "https://git.kernel.org/stable/c/f803c086399da277b5d0ff36a107d0f162751800"}], "title": "ip6_tunnel: clear skb2->cb[] in ip6ip6_err()", "x_generator": {"engine": "bippy-1.2.0"}}, "adp": [{"metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74597", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:01:48.402907Z"}}}], "title": "CISA ADP Vulnrichment", "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:06:00.036Z"}}]}}

{"dataType": "CVE_RECORD", "containers": {"adp": [{"title": "CISA ADP Vulnrichment", "metrics": [{"other": {"type": "ssvc", "content": {"id": "CVE-2026-74597", "role": "CISA Coordinator", "options": [{"Exploitation": "none"}, {"Automatable": "yes"}, {"Technical Impact": "total"}], "version": "2.0.3", "timestamp": "2026-10-16T19:01:48.402907Z"}}}], "providerMetadata": {"orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:01:52.236Z"}}], "cna": {"title": "ip6_tunnel: clear skb2->cb[] in ip6ip6_err()", "metrics": [{"cvssV3_1": {"version": "3.1", "baseScore": 9.8, "baseSeverity": "CRITICAL", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H"}, "scenarios": [{"lang": "en", "value": "AV:N - The bug is reached when a remote peer sends a forged ICMPv6 error whose quoted payload is an IPv6-in-IPv6 tunnel datagram; processing follows the normal IPv6 receive path (ipv6_rcv -> icmpv6_notify -> tunnel6_err -> ip6ip6_err) with no local access required.\nAC:L - The attacker controls the carrier IPv6 Home Address Option, quoted tunnel/inner headers, and ICMP error type; once an ip6tnl endpoint exists (normal for this subsystem), triggering the stale-dsthao path is reliable and needs no races or victim interaction.\nPR:N - No authentication or capabilities are required on the target; unprivileged remote senders can deliver crafted ICMPv6 errors that the kernel processes on the standard pre-auth receive path (INET6_PROTO_NOPOLICY).\nUI:N - Exploitation requires only delivering a malicious network packet; no victim must open files, click links, or perform any other action.\nS:U - Impact is in-kernel memory corruption on the receiving host within the same security authority; it does not by itself cross VM, container, or IOMMU boundaries.\nC:H - With CONFIG_IPV6_MIP6, mip6_addr_swap() uses the stale dsthao offset to scan the quoted inner packet and can read attacker-controlled bytes past the skb tail while resolving a fake HAO TLV before swapping addresses.\nI:H - The resulting 16-byte swap(iph->saddr, hao->addr) can write beyond the quoted packet into skb_shared_info, giving attacker-influenced heap corruption suitable for further control-flow or data manipulation.\nA:H - Corrupting skb_shared_info from the network input path can cause kernel oops/panic or otherwise deny service on IPv6 tunnel endpoints, and the condition is repeatable with crafted packets."}]}], "affected": [{"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "lessThan": "44fe898df302e91c5ee5acbc71ffa74e78e6c183", "versionType": "git"}, {"status": "affected", "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "lessThan": "0dadb0620ab65949a8bc2439dd28ea3c942fe87d", "versionType": "git"}, {"status": "affected", "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "lessThan": "b6816536a2990c0db44a26130a03e40b441e829b", "versionType": "git"}, {"status": "affected", "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "lessThan": "64e41736a26f37ab6215bc2e6df125df05aceb08", "versionType": "git"}, {"status": "affected", "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "lessThan": "484134e1eb07d700a73b1e4bbf3fb503e299be60", "versionType": "git"}, {"status": "affected", "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "lessThan": "4eb15c465337b18f44716c499cd6ad63eee0ad54", "versionType": "git"}, {"status": "affected", "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "lessThan": "fbf40faa0414b753212494ad197542002e66ed9e", "versionType": "git"}, {"status": "affected", "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "lessThan": "f803c086399da277b5d0ff36a107d0f162751800", "versionType": "git"}], "programFiles": ["net/ipv6/ip6_tunnel.c"], "defaultStatus": "unaffected"}, {"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "product": "Linux", "versions": [{"status": "affected", "version": "2.6.22"}, {"status": "unaffected", "version": "0", "lessThan": "2.6.22", "versionType": "semver"}, {"status": "unaffected", "version": "5.10.265", "versionType": "semver", "lessThanOrEqual": "5.10.*"}, {"status": "unaffected", "version": "5.15.216", "versionType": "semver", "lessThanOrEqual": "5.15.*"}, {"status": "unaffected", "version": "6.1.183", "versionType": "semver", "lessThanOrEqual": "6.1.*"}, {"status": "unaffected", "version": "6.6.152", "versionType": "semver", "lessThanOrEqual": "6.6.*"}, {"status": "unaffected", "version": "6.12.104", "versionType": "semver", "lessThanOrEqual": "6.12.*"}, {"status": "unaffected", "version": "6.18.45", "versionType": "semver", "lessThanOrEqual": "6.18.*"}, {"status": "unaffected", "version": "7.1.9", "versionType": "semver", "lessThanOrEqual": "7.1.*"}, {"status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix", "lessThanOrEqual": "*"}], "programFiles": ["net/ipv6/ip6_tunnel.c"], "defaultStatus": "affected"}], "references": [{"url": "https://git.kernel.org/stable/c/44fe898df302e91c5ee5acbc71ffa74e78e6c183"}, {"url": "https://git.kernel.org/stable/c/0dadb0620ab65949a8bc2439dd28ea3c942fe87d"}, {"url": "https://git.kernel.org/stable/c/b6816536a2990c0db44a26130a03e40b441e829b"}, {"url": "https://git.kernel.org/stable/c/64e41736a26f37ab6215bc2e6df125df05aceb08"}, {"url": "https://git.kernel.org/stable/c/484134e1eb07d700a73b1e4bbf3fb503e299be60"}, {"url": "https://git.kernel.org/stable/c/4eb15c465337b18f44716c499cd6ad63eee0ad54"}, {"url": "https://git.kernel.org/stable/c/fbf40faa0414b753212494ad197542002e66ed9e"}, {"url": "https://git.kernel.org/stable/c/f803c086399da277b5d0ff36a107d0f162751800"}], "x_generator": {"engine": "bippy-1.2.0"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6_tunnel: clear skb2->cb[] in ip6ip6_err()\n\nip6ip6_err() clones an outer IPv6 ICMP error skb, pulls it to the\nquoted inner IPv6 packet, and then passes the clone to icmpv6_send().\nThe clone still carries the outer packet's inet6_skb_parm in skb->cb.\n\nIf the outer packet had a Home Address Option, IP6CB(skb2)->dsthao\nremains non-zero after skb_pull(). icmpv6_send() later calls\nmip6_addr_swap(), which uses that stale dsthao offset against the quoted\ninner packet. A malformed inner destination-options header can then make\nthe HAO lookup and address swap run past the end of the quoted packet\nand corrupt skb_shared_info.\n\nClear skb2->cb[] before pulling the quoted inner IPv6 packet so the\nreply path does not reuse metadata left by the outer IPv6 stack."}], "cpeApplicability": [{"nodes": [{"negate": false, "cpeMatch": [{"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.10.265", "versionStartIncluding": "2.6.22"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "5.15.216", "versionStartIncluding": "2.6.22"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.1.183", "versionStartIncluding": "2.6.22"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.6.152", "versionStartIncluding": "2.6.22"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.12.104", "versionStartIncluding": "2.6.22"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "6.18.45", "versionStartIncluding": "2.6.22"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.1.9", "versionStartIncluding": "2.6.22"}, {"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "vulnerable": true, "versionEndExcluding": "7.2", "versionStartIncluding": "2.6.22"}], "operator": "OR"}]}], "providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:40:23.709Z"}}}, "cveMetadata": {"cveId": "CVE-2026-74597", "state": "PUBLISHED", "dateUpdated": "2026-10-16T19:06:00.036Z", "dateReserved": "2026-08-15T05:44:03.919Z", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "datePublished": "2026-08-22T15:31:47.120Z", "assignerShortName": "Linux"}, "dataVersion": "5.2"}

{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/ipv6/ip6_tunnel.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "44fe898df302e91c5ee5acbc71ffa74e78e6c183", "status": "affected", "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "versionType": "git"}, {"lessThan": "0dadb0620ab65949a8bc2439dd28ea3c942fe87d", "status": "affected", "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "versionType": "git"}, {"lessThan": "b6816536a2990c0db44a26130a03e40b441e829b", "status": "affected", "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "versionType": "git"}, {"lessThan": "64e41736a26f37ab6215bc2e6df125df05aceb08", "status": "affected", "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "versionType": "git"}, {"lessThan": "484134e1eb07d700a73b1e4bbf3fb503e299be60", "status": "affected", "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "versionType": "git"}, {"lessThan": "4eb15c465337b18f44716c499cd6ad63eee0ad54", "status": "affected", "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "versionType": "git"}, {"lessThan": "fbf40faa0414b753212494ad197542002e66ed9e", "status": "affected", "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "versionType": "git"}, {"lessThan": "f803c086399da277b5d0ff36a107d0f162751800", "status": "affected", "version": "e490d1d85cf5e191791979e5f260d32eb4f703a8", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/ipv6/ip6_tunnel.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.22"}, {"lessThan": "2.6.22", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.265", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.216", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.183", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.152", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.104", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.45", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.9", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nip6_tunnel: clear skb2->cb[] in ip6ip6_err()\n\nip6ip6_err() clones an outer IPv6 ICMP error skb, pulls it to the\nquoted inner IPv6 packet, and then passes the clone to icmpv6_send().\nThe clone still carries the outer packet's inet6_skb_parm in skb->cb.\n\nIf the outer packet had a Home Address Option, IP6CB(skb2)->dsthao\nremains non-zero after skb_pull(). icmpv6_send() later calls\nmip6_addr_swap(), which uses that stale dsthao offset against the quoted\ninner packet. A malformed inner destination-options header can then make\nthe HAO lookup and address swap run past the end of the quoted packet\nand corrupt skb_shared_info.\n\nClear skb2->cb[] before pulling the quoted inner IPv6 packet so the\nreply path does not reuse metadata left by the outer IPv6 stack."}, {"lang": "es", "value": "En el kernel de Linux, la siguiente vulnerabilidad ha sido resuelta:\n\nip6_tunnel: limpiar skb2 -> cb[] en ip6ip6_err()\n\nip6ip6_err() clona un skb de error ICMP IPv6 externo, lo extrae al paquete IPv6 interno citado y luego pasa el clon a icmpv6_send(). El clon todav\u00eda lleva el inet6_skb_parm del paquete externo en skb -> cb.\n\nSi el paquete externo ten\u00eda una Opci\u00f3n de Direcci\u00f3n de Origen (Home Address Option), IP6CB(skb2) -> dsthao permanece distinto de cero despu\u00e9s de skb_pull(). icmpv6_send() m\u00e1s tarde llama a mip6_addr_swap(), que utiliza ese desplazamiento dsthao obsoleto contra el paquete interno citado. Un encabezado de opciones de destino interno malformado puede entonces hacer que la b\u00fasqueda HAO y el intercambio de direcciones se ejecuten m\u00e1s all\u00e1 del final del paquete citado y corrompan skb_shared_info.\n\nLimpiar skb2 -> cb[] antes de extraer el paquete IPv6 interno citado para que la ruta de respuesta no reutilice los metadatos dejados por la pila IPv6 externa."}], "id": "CVE-2026-74597", "lastModified": "2026-10-16T20:17:45.070", "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-2026-74597", "options": [{"exploitation": "none"}, {"automatable": "yes"}, {"technicalImpact": "total"}], "role": "CISA Coordinator", "timestamp": "2026-10-16T19:01:48.402907Z", "version": "2.0.3"}}]}, "published": "2026-08-22T16:16:32.040", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/0dadb0620ab65949a8bc2439dd28ea3c942fe87d"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/44fe898df302e91c5ee5acbc71ffa74e78e6c183"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/484134e1eb07d700a73b1e4bbf3fb503e299be60"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/4eb15c465337b18f44716c499cd6ad63eee0ad54"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/64e41736a26f37ab6215bc2e6df125df05aceb08"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/b6816536a2990c0db44a26130a03e40b441e829b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/f803c086399da277b5d0ff36a107d0f162751800"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fbf40faa0414b753212494ad197542002e66ed9e"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ip6_tunnel: clear skb2->cb[] in ip6ip6_err()", "id": "2521409", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521409"}, "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-787", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nip6_tunnel: clear skb2->cb[] in ip6ip6_err()\nip6ip6_err() clones an outer IPv6 ICMP error skb, pulls it to the\nquoted inner IPv6 packet, and then passes the clone to icmpv6_send().\nThe clone still carries the outer packet's inet6_skb_parm in skb->cb.\nIf the outer packet had a Home Address Option, IP6CB(skb2)->dsthao\nremains non-zero after skb_pull(). icmpv6_send() later calls\nmip6_addr_swap(), which uses that stale dsthao offset against the quoted\ninner packet. A malformed inner destination-options header can then make\nthe HAO lookup and address swap run past the end of the quoted packet\nand corrupt skb_shared_info.\nClear skb2->cb[] before pulling the quoted inner IPv6 packet so the\nreply path does not reuse metadata left by the outer IPv6 stack.", "A flaw was found in the Linux kernel's IPv6 (Internet Protocol version 6) tunnel error handling. A remote attacker could send a specially crafted IPv6 ICMP (Internet Control Message Protocol) error packet with a malformed inner destination-options header. This could lead to memory corruption within the kernel's socket buffer shared information, potentially causing a denial of service (DoS) on the system."], "name": "CVE-2026-74597", "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": "2026-08-22T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74597\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74597\nhttps://lore.kernel.org/linux-cve-announce/2026082214-CVE-2026-74597-98fc@gregkh/T"], "threat_severity": "Important"}

{"affected": [{"configurations": [{"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e490d1d85cf5e191791979e5f260d32eb4f703a8,44fe898df302e91c5ee5acbc71ffa74e78e6c183)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e490d1d85cf5e191791979e5f260d32eb4f703a8,0dadb0620ab65949a8bc2439dd28ea3c942fe87d)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e490d1d85cf5e191791979e5f260d32eb4f703a8,b6816536a2990c0db44a26130a03e40b441e829b)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e490d1d85cf5e191791979e5f260d32eb4f703a8,64e41736a26f37ab6215bc2e6df125df05aceb08)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e490d1d85cf5e191791979e5f260d32eb4f703a8,484134e1eb07d700a73b1e4bbf3fb503e299be60)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e490d1d85cf5e191791979e5f260d32eb4f703a8,4eb15c465337b18f44716c499cd6ad63eee0ad54)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e490d1d85cf5e191791979e5f260d32eb4f703a8,fbf40faa0414b753212494ad197542002e66ed9e)"}}, {"platform": null, "status": "affected", "versions": {"scheme": "code_commit", "value": "[e490d1d85cf5e191791979e5f260d32eb4f703a8,f803c086399da277b5d0ff36a107d0f162751800)"}}], "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": "semver", "value": "2.6.22"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[0,2.6.22)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.10.265,5.11.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[5.15.216,5.16.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.1.183,6.2.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.6.152,6.7.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.12.104,6.13.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[6.18.45,6.19.0)"}}, {"platform": null, "status": "unaffected", "versions": {"scheme": "semver", "value": "[7.1.9,7.2.0)"}}, {"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": "2026-08-22T17:00:10.306323+00:00", "updated": "2026-08-25T07:30:12.108247+00:00", "vendors": ["linux", "linux$PRODUCT$linux_kernel"], "weaknesses": ["CWE-787"]}