{"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"}}}}