CVE-2026-72319 (GCVE-0-2026-72319)
Vulnerability from cvelistv5
Published
2026-08-15 05:55
Modified
2026-08-17 05:42
Severity ?
VLAI Severity ?
EPSS score ?
Summary
In the Linux kernel, the following vulnerability has been resolved:
ipvs: ensure inner headers in ICMP errors are in headroom
Sashiko points out that after stripping the outer headers
with pskb_pull() we should ensure the inner IP headers
in ICMP errors from tunnels are present in the skb headroom
for functions like ipv4_update_pmtu(), icmp_send() and
IP_VS_DBG().
Also, add more checks for the length of the inner headers.
References
Impacted products
| Vendor | Product | Version | ||
|---|---|---|---|---|
| Linux | Linux |
Version: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e Version: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e Version: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e Version: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e Version: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e Version: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e Version: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e Version: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e |
||
{
"containers": {
"cna": {
"affected": [
{
"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": "19657b3a17b774ae4e2f2635b5ae8638c9344a40",
"status": "affected",
"version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e",
"versionType": "git"
},
{
"lessThan": "dac813101914c21219ac221a60a31a11bc90e7ec",
"status": "affected",
"version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e",
"versionType": "git"
},
{
"lessThan": "dd22f74a09e25ca298ced0a3763ef353242cb78d",
"status": "affected",
"version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e",
"versionType": "git"
},
{
"lessThan": "9bc9b95aee2b2e3f1301a16a67ee504960402875",
"status": "affected",
"version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e",
"versionType": "git"
},
{
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"status": "affected",
"version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e",
"versionType": "git"
},
{
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"status": "affected",
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"versionType": "git"
},
{
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"status": "affected",
"version": "f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e",
"versionType": "git"
},
{
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"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": "5.10.261",
"versionType": "semver"
},
{
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"version": "5.15.212",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"version": "6.1.178",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.6.*",
"status": "unaffected",
"version": "6.6.145",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.12.*",
"status": "unaffected",
"version": "6.12.97",
"versionType": "semver"
},
{
"lessThanOrEqual": "6.18.*",
"status": "unaffected",
"version": "6.18.40",
"versionType": "semver"
},
{
"lessThanOrEqual": "7.1.*",
"status": "unaffected",
"version": "7.1.5",
"versionType": "semver"
},
{
"lessThanOrEqual": "*",
"status": "unaffected",
"version": "7.2",
"versionType": "original_commit_for_fix"
}
]
}
],
"cpeApplicability": [
{
"nodes": [
{
"cpeMatch": [
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.10.261",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "5.15.212",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.1.178",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.6.145",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.12.97",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "6.18.40",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.1.5",
"versionStartIncluding": "3.7",
"vulnerable": true
},
{
"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
"versionEndExcluding": "7.2",
"versionStartIncluding": "3.7",
"vulnerable": true
}
],
"negate": false,
"operator": "OR"
}
]
}
],
"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": {
"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",
"version": "3.1"
},
"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-\u003edata 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-\u003edata 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": {
"dateUpdated": "2026-08-17T05:42:45.694Z",
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux"
},
"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"
}
}
},
"cveMetadata": {
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"assignerShortName": "Linux",
"cveId": "CVE-2026-72319",
"datePublished": "2026-08-15T05:55:32.313Z",
"dateReserved": "2026-08-09T03:40:39.919Z",
"dateUpdated": "2026-08-17T05:42:45.694Z",
"state": "PUBLISHED"
},
"dataType": "CVE_RECORD",
"dataVersion": "5.2"
}
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Sightings
| Author | Source | Type | Date |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
- Confirmed: The vulnerability is confirmed from an analyst perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
- Patched: This vulnerability was successfully patched by the user reporting the sighting.
- Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
- Not confirmed: The user expresses doubt about the veracity of the vulnerability.
- Not patched: This vulnerability was not successfully patched by the user reporting the sighting.
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