{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-72319", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-09T03:40:39.919Z", "datePublished": "2026-08-15T05:55:32.313Z", "dateUpdated": "2026-08-17T05:42:45.694Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-17T05:42:45.694Z" }, "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." } ], "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." } ] } ], "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": "19657b3a17b774ae4e2f2635b5ae8638c9344a40", "status": "affected", "versionType": "git" }, { "version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "lessThan": "dac813101914c21219ac221a60a31a11bc90e7ec", "status": "affected", "versionType": "git" }, { "version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "lessThan": "dd22f74a09e25ca298ced0a3763ef353242cb78d", "status": "affected", "versionType": "git" }, { "version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "lessThan": "9bc9b95aee2b2e3f1301a16a67ee504960402875", "status": "affected", "versionType": "git" }, { "version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "lessThan": "a735f9964a3d9ed97daf9b08507f8b5bcafe6326", "status": "affected", "versionType": "git" }, { "version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "lessThan": "8f48cfe657409fb5c7ba0521b14da6d47546d9cf", "status": "affected", "versionType": "git" }, { "version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "lessThan": "92185d6f7819bc558939ae83de7b1abe90e3b5c2", "status": "affected", "versionType": "git" }, { "version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e", "lessThan": "3f7a535ff0fa627a0132803e4c2f903ceffcbc1c", "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": "5.10.261", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.212", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.178", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.145", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.97", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.40", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.1.5", "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": "5.10.261" }, { "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" } ] } ] } ], "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" } ], "title": "ipvs: ensure inner headers in ICMP errors are in headroom", "x_generator": { "engine": "bippy-1.2.0" } } } }