{"id":"CVE-2026-72319","state":"PUBLISHED","title":"ipvs: ensure inner headers in ICMP errors are in headroom","description":"In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: ensure inner headers in ICMP errors are in headroom\n\nSashiko points out that after stripping the outer headers\nwith pskb_pull() we should ensure the inner IP headers\nin ICMP errors from tunnels are present in the skb headroom\nfor functions like ipv4_update_pmtu(), icmp_send() and\nIP_VS_DBG().\n\nAlso, add more checks for the length of the inner headers.","publishedAt":"2026-08-15T05:55:32.313Z","updatedAt":"2026-10-16T18:55:17.469Z","severity":{"score":9.8,"label":"Critical","version":"3.1","vector":"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e","status":"affected","lessThan":"19657b3a17b774ae4e2f2635b5ae8638c9344a40","versionType":"git"},{"version":"f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e","status":"affected","lessThan":"dac813101914c21219ac221a60a31a11bc90e7ec","versionType":"git"},{"version":"f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e","status":"affected","lessThan":"dd22f74a09e25ca298ced0a3763ef353242cb78d","versionType":"git"},{"version":"f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e","status":"affected","lessThan":"9bc9b95aee2b2e3f1301a16a67ee504960402875","versionType":"git"},{"version":"f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e","status":"affected","lessThan":"a735f9964a3d9ed97daf9b08507f8b5bcafe6326","versionType":"git"},{"version":"f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e","status":"affected","lessThan":"8f48cfe657409fb5c7ba0521b14da6d47546d9cf","versionType":"git"},{"version":"f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e","status":"affected","lessThan":"92185d6f7819bc558939ae83de7b1abe90e3b5c2","versionType":"git"},{"version":"f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e","status":"affected","lessThan":"3f7a535ff0fa627a0132803e4c2f903ceffcbc1c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/ipvs/ip_vs_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.7","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/ipvs/ip_vs_core.c"]}],"references":["https://git.kernel.org/stable/c/19657b3a17b774ae4e2f2635b5ae8638c9344a40","https://git.kernel.org/stable/c/dac813101914c21219ac221a60a31a11bc90e7ec","https://git.kernel.org/stable/c/dd22f74a09e25ca298ced0a3763ef353242cb78d","https://git.kernel.org/stable/c/9bc9b95aee2b2e3f1301a16a67ee504960402875","https://git.kernel.org/stable/c/a735f9964a3d9ed97daf9b08507f8b5bcafe6326","https://git.kernel.org/stable/c/8f48cfe657409fb5c7ba0521b14da6d47546d9cf","https://git.kernel.org/stable/c/92185d6f7819bc558939ae83de7b1abe90e3b5c2","https://git.kernel.org/stable/c/3f7a535ff0fa627a0132803e4c2f903ceffcbc1c"],"weaknesses":[],"ingestedAt":"2026-10-29T20:12:58.252Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/72xxx/CVE-2026-72319.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-72319","state":"PUBLISHED","datePublished":"2026-08-15T05:55:32.313Z","dateUpdated":"2026-10-16T18:55:17.469Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-08-09T03:40:39.919Z"},"containers":{"cna":{"title":"ipvs: ensure inner headers in ICMP errors are in headroom","descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nipvs: ensure inner headers in ICMP errors are in headroom\n\nSashiko points out that after stripping the outer headers\nwith pskb_pull() we should ensure the inner IP headers\nin ICMP errors from tunnels are present in the skb headroom\nfor functions like ipv4_update_pmtu(), icmp_send() and\nIP_VS_DBG().\n\nAlso, add more checks for the length of the inner headers."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e","status":"affected","lessThan":"19657b3a17b774ae4e2f2635b5ae8638c9344a40","versionType":"git"},{"version":"f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e","status":"affected","lessThan":"dac813101914c21219ac221a60a31a11bc90e7ec","versionType":"git"},{"version":"f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e","status":"affected","lessThan":"dd22f74a09e25ca298ced0a3763ef353242cb78d","versionType":"git"},{"version":"f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e","status":"affected","lessThan":"9bc9b95aee2b2e3f1301a16a67ee504960402875","versionType":"git"},{"version":"f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e","status":"affected","lessThan":"a735f9964a3d9ed97daf9b08507f8b5bcafe6326","versionType":"git"},{"version":"f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e","status":"affected","lessThan":"8f48cfe657409fb5c7ba0521b14da6d47546d9cf","versionType":"git"},{"version":"f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e","status":"affected","lessThan":"92185d6f7819bc558939ae83de7b1abe90e3b5c2","versionType":"git"},{"version":"f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e","status":"affected","lessThan":"3f7a535ff0fa627a0132803e4c2f903ceffcbc1c","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/ipvs/ip_vs_core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"3.7","status":"affected"},{"version":"0","status":"unaffected","lessThan":"3.7","versionType":"semver"},{"version":"5.10.261","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.212","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.178","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.145","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.97","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.40","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.1.5","status":"unaffected","lessThanOrEqual":"7.1.*","versionType":"semver"},{"version":"7.2","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["net/netfilter/ipvs/ip_vs_core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/19657b3a17b774ae4e2f2635b5ae8638c9344a40"},{"url":"https://git.kernel.org/stable/c/dac813101914c21219ac221a60a31a11bc90e7ec"},{"url":"https://git.kernel.org/stable/c/dd22f74a09e25ca298ced0a3763ef353242cb78d"},{"url":"https://git.kernel.org/stable/c/9bc9b95aee2b2e3f1301a16a67ee504960402875"},{"url":"https://git.kernel.org/stable/c/a735f9964a3d9ed97daf9b08507f8b5bcafe6326"},{"url":"https://git.kernel.org/stable/c/8f48cfe657409fb5c7ba0521b14da6d47546d9cf"},{"url":"https://git.kernel.org/stable/c/92185d6f7819bc558939ae83de7b1abe90e3b5c2"},{"url":"https://git.kernel.org/stable/c/3f7a535ff0fa627a0132803e4c2f903ceffcbc1c"}],"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 - Crafted IPv4 ICMP error packets reach ip_vs_in_icmp() through IPVS netfilter LOCAL_IN and FORWARD hooks on internet-facing load balancers and Kubernetes kube-proxy IPVS nodes; remote senders trigger the tunnel PMTUD handler without local access.\nAC:L - An attacker controls ICMP nesting, IPIP/UDP/GRE encapsulation, skb fragmentation/non-linear layout, and can establish matching IPVS TUN connections through the VIP; no race or condition outside attacker control is required once IPVS tunnel mode is deployed.\nPR:N - IPVS configuration is an administrator deployment prerequisite; a remote attacker sending ICMP errors to an already-configured load balancer needs no credentials or host capabilities on the victim.\nUI:N - Exploitation is driven entirely by network packets processed automatically in softirq; no victim user action beyond normal traffic through the load balancer is required.\nS:U - Out-of-bounds kernel skb header access and route PMTU corruption remain within the host kernel authority; this is standard kernel compromise, not VM escape or sandbox crossing.\nC:H - After pskb_pull() without pskb_may_pull(), ipv4_update_pmtu() and ip_hdr() dereference skb->data that may lie past skb_tail_pointer or hold non-linear fragment data, constituting an out-of-bounds kernel read per CNA guidance.\nI:H - Mis-parsed inner IP header fields from unchecked skb->data drive ipv4_update_pmtu() route lookups and FNHE/PMTU updates with attacker-influenced saddr/daddr values, enabling unauthorized modification of kernel routing state.\nA:H - Out-of-bounds header access in the IPVS ICMP tunnel path can trigger kernel oops or panic, and a remote attacker can repeatedly send crafted ICMP errors to deny service on IPVS TUN load balancers."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-08-17T05:42:45.694Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"5.10.261"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"5.15.212"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"6.1.178"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"6.6.145"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"6.12.97"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"6.18.40"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"7.1.5"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"3.7","versionEndExcluding":"7.2"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"title":"CISA ADP Vulnrichment","metrics":[{"other":{"type":"ssvc","content":{"id":"CVE-2026-72319","role":"CISA Coordinator","options":[{"Exploitation":"none"},{"Automatable":"yes"},{"Technical Impact":"total"}],"version":"2.0.3","timestamp":"2026-10-16T18:46:50.262793Z"}}}],"providerMetadata":{"shortName":"CISA-ADP","orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","dateUpdated":"2026-10-16T18:55:17.469Z"}}]}}}