{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74669", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.924Z", "datePublished": "2026-08-22T15:32:40.221Z", "dateUpdated": "2026-08-25T05:41:24.114Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-25T05:41:24.114Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: clear IPv4 options after rebasing tunnel ICMP errors\n\nip_vs_in_icmp() rebases an skb from the outer ICMP packet to the\nquoted original request before passing it to icmp_send(). However,\nIPCB(skb)->opt still describes the outer IPv4 header.\n\nA timestamp option in the outer header can therefore leave an offset\nthat points into the quoted transport header after the rebase.\n__ip_options_echo() treats a byte at that stale location as the option\nlength and copies it into the fixed-size option storage on the\n__icmp_send() stack, causing a stack out-of-bounds write.\n\nClear the stale option metadata after resetting the network header.\nKeep the remaining control block fields, including the ingress\ninterface used by the ICMP response path."}], "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 hit when a remote peer sends a crafted ICMP error to an IPVS load balancer; processing occurs in the IPv4 LOCAL_IN/FORWARD netfilter path on received network packets before icmp_send().\nAC:L - An attacker can reliably trigger the path by opening IPVS tunnel traffic, then sending an ICMP error whose outer IPv4 header includes a timestamp option and whose quoted payload aligns bytes at the stale option offset to a large length.\nPR:N - Exploitation requires only the ability to send IPv4/ICMP to the target; the remote attacker needs no local account, capability, or authentication on the victim host.\nUI:N - No victim user action is required beyond normal exposure of an IPVS tunnel load balancer to the network; exploitation is driven entirely by attacker-sent packets.\nS:U - Impact is confined to kernel memory/stack corruption and privilege boundaries within the host kernel; it does not cross into another security authority such as a VM guest or separate sandbox domain.\nC:H - The stale IPCB option metadata drives __ip_options_echo() to memcpy() from attacker-influenced skb bytes into a 40-byte stack buffer, enabling out-of-bounds kernel memory access that can disclose stack/kernel data.\nI:H - The stack out-of-bounds write in __icmp_send() is attacker-controlled in length and content via crafted quoted headers, providing a standard memory-corruption primitive that can corrupt return addresses and enable arbitrary kernel code execution.\nA:H - Corrupting the __icmp_send() stack frame can immediately panic or oops the kernel during ICMP processing, causing complete loss of availability on the load balancer."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["net/netfilter/ipvs/ip_vs_core.c"], "versions": [{"version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "lessThan": "79ffa99202c944467e28b13b513bf2998732edff", "status": "affected", "versionType": "git"}, {"version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "lessThan": "c9413b50204738fbc429bb86bf01353c393a6c28", "status": "affected", "versionType": "git"}, {"version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "lessThan": "37c61b3745129cbd682c557b51345828120972e5", "status": "affected", "versionType": "git"}, {"version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "lessThan": "ed246dd85ebf27c1f6b7897834d40786c0ca3006", "status": "affected", "versionType": "git"}, {"version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "lessThan": "6f46fc460e9316062bdcdf89199eb5d7a33da33b", "status": "affected", "versionType": "git"}, {"version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "lessThan": "75eec935444db4af2123e0491936f6e273d7ea00", "status": "affected", "versionType": "git"}, {"version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "lessThan": "384b4dae14277d369221d187e9b3af56c79d2e50", "status": "affected", "versionType": "git"}, {"version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "lessThan": "e0ba936287dfe9783426aac27e5fd76fe35b38c9", "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/netfilter/ipvs/ip_vs_core.c"], "versions": [{"version": "3.7", "status": "affected"}, {"version": "0", "lessThan": "3.7", "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": "3.7", "versionEndExcluding": "5.10.265"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "5.15.216"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.1.183"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.6.152"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.12.104"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "6.18.45"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "7.1.9"}, {"vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "3.7", "versionEndExcluding": "7.2"}]}]}], "references": [{"url": "https://git.kernel.org/stable/c/79ffa99202c944467e28b13b513bf2998732edff"}, {"url": "https://git.kernel.org/stable/c/c9413b50204738fbc429bb86bf01353c393a6c28"}, {"url": "https://git.kernel.org/stable/c/37c61b3745129cbd682c557b51345828120972e5"}, {"url": "https://git.kernel.org/stable/c/ed246dd85ebf27c1f6b7897834d40786c0ca3006"}, {"url": "https://git.kernel.org/stable/c/6f46fc460e9316062bdcdf89199eb5d7a33da33b"}, {"url": "https://git.kernel.org/stable/c/75eec935444db4af2123e0491936f6e273d7ea00"}, {"url": "https://git.kernel.org/stable/c/384b4dae14277d369221d187e9b3af56c79d2e50"}, {"url": "https://git.kernel.org/stable/c/e0ba936287dfe9783426aac27e5fd76fe35b38c9"}], "title": "ipvs: clear IPv4 options after rebasing tunnel ICMP errors", "x_generator": {"engine": "bippy-1.2.0"}}}}

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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["net/netfilter/ipvs/ip_vs_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "79ffa99202c944467e28b13b513bf2998732edff", "status": "affected", "version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "versionType": "git"}, {"lessThan": "c9413b50204738fbc429bb86bf01353c393a6c28", "status": "affected", "version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "versionType": "git"}, {"lessThan": "37c61b3745129cbd682c557b51345828120972e5", "status": "affected", "version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "versionType": "git"}, {"lessThan": "ed246dd85ebf27c1f6b7897834d40786c0ca3006", "status": "affected", "version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "versionType": "git"}, {"lessThan": "6f46fc460e9316062bdcdf89199eb5d7a33da33b", "status": "affected", "version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "versionType": "git"}, {"lessThan": "75eec935444db4af2123e0491936f6e273d7ea00", "status": "affected", "version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "versionType": "git"}, {"lessThan": "384b4dae14277d369221d187e9b3af56c79d2e50", "status": "affected", "version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "versionType": "git"}, {"lessThan": "e0ba936287dfe9783426aac27e5fd76fe35b38c9", "status": "affected", "version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["net/netfilter/ipvs/ip_vs_core.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "3.7"}, {"lessThan": "3.7", "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\nipvs: clear IPv4 options after rebasing tunnel ICMP errors\n\nip_vs_in_icmp() rebases an skb from the outer ICMP packet to the\nquoted original request before passing it to icmp_send(). However,\nIPCB(skb)->opt still describes the outer IPv4 header.\n\nA timestamp option in the outer header can therefore leave an offset\nthat points into the quoted transport header after the rebase.\n__ip_options_echo() treats a byte at that stale location as the option\nlength and copies it into the fixed-size option storage on the\n__icmp_send() stack, causing a stack out-of-bounds write.\n\nClear the stale option metadata after resetting the network header.\nKeep the remaining control block fields, including the ingress\ninterface used by the ICMP response path."}], "id": "CVE-2026-74669", "lastModified": "2026-08-25T06:18:49.053", "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"}]}, "published": "2026-08-22T16:16:40.827", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/37c61b3745129cbd682c557b51345828120972e5"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/384b4dae14277d369221d187e9b3af56c79d2e50"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/6f46fc460e9316062bdcdf89199eb5d7a33da33b"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/75eec935444db4af2123e0491936f6e273d7ea00"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/79ffa99202c944467e28b13b513bf2998732edff"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/c9413b50204738fbc429bb86bf01353c393a6c28"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/e0ba936287dfe9783426aac27e5fd76fe35b38c9"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/ed246dd85ebf27c1f6b7897834d40786c0ca3006"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: ipvs: clear IPv4 options after rebasing tunnel ICMP errors", "id": "2521375", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2521375"}, "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": ["A flaw was found in the Linux kernel's IP Virtual Server (IPVS) component. When processing Internet Control Message Protocol (ICMP) errors for tunneled packets, the system can incorrectly use a stale IPv4 option offset. A remote attacker could exploit this by sending a specially crafted ICMP packet, leading to a stack out-of-bounds write. This vulnerability could result in a denial of service or potentially arbitrary code execution."], "name": "CVE-2026-74669", "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-2026-74669\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74669\nhttps://lore.kernel.org/linux-cve-announce/2026082229-CVE-2026-74669-f574@gregkh/T"], "threat_severity": "Important"}