CVE-2026-72319 (GCVE-0-2026-72319)
Vulnerability from cvelistv5 – Published: 2026-08-15 05:55 – Updated: 2026-10-16 18:55
VLAI
EPSS
VEX
Title
ipvs: ensure inner headers in ICMP errors are in headroom
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.
Severity
9.8 (Critical)
SSVC
Exploitation: none
Automatable: yes
Technical Impact: total
CISA Coordinator · CISA-ADP (v2.0.3)
Decision recorded 2026-10-16 18:46 UTC
Assigner
References
8 references
Impacted products
2 products
| Vendor | Product | Version | CPE status | |
|---|---|---|---|---|
| Linux | Linux |
Affected:
f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e , < 19657b3a17b774ae4e2f2635b5ae8638c9344a40
(git)
Affected: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e , < dac813101914c21219ac221a60a31a11bc90e7ec (git) Affected: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e , < dd22f74a09e25ca298ced0a3763ef353242cb78d (git) Affected: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e , < 9bc9b95aee2b2e3f1301a16a67ee504960402875 (git) Affected: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e , < a735f9964a3d9ed97daf9b08507f8b5bcafe6326 (git) Affected: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e , < 8f48cfe657409fb5c7ba0521b14da6d47546d9cf (git) Affected: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e , < 92185d6f7819bc558939ae83de7b1abe90e3b5c2 (git) Affected: f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e , < 3f7a535ff0fa627a0132803e4c2f903ceffcbc1c (git) |
guessed | |
| Linux | Linux |
Affected:
3.7
Unaffected: 0 , < 3.7 (semver) Unaffected: 5.10.261 , ≤ 5.10.* (semver) Unaffected: 5.15.212 , ≤ 5.15.* (semver) Unaffected: 6.1.178 , ≤ 6.1.* (semver) Unaffected: 6.6.145 , ≤ 6.6.* (semver) Unaffected: 6.12.97 , ≤ 6.12.* (semver) Unaffected: 6.18.40 , ≤ 6.18.* (semver) Unaffected: 7.1.5 , ≤ 7.1.* (semver) Unaffected: 7.2 , ≤ * (original_commit_for_fix) |
guessed |
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"version": "6.12.97",
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},
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{
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}
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"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."
}
]
}
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"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."
}
],
"id": "CVE-2026-72319",
"lastModified": "2026-10-16T19:17:22.527",
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"attackVector": "NETWORK",
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"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",
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}
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},
{
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}
],
"sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"vulnStatus": "Received"
}
},
"redhat_vex": {
"aggregate_severity": "Important",
"current_release_date": "2026-10-15T10:56:54+00:00",
"cve": "CVE-2026-72319",
"id": "CVE-2026-72319",
"initial_release_date": "2026-08-15T00:00:00+00:00",
"product_status:known_affected": "261",
"product_status:known_not_affected": "14",
"source": "Red Hat CSAF VEX",
"status": "final",
"title": "kernel: ipvs: ensure inner headers in ICMP errors are in headroom",
"url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72319.json",
"version": "3"
}
}
}
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Sightings
| Author | Source | Type | Date | Other |
|---|
Nomenclature
- Seen: The vulnerability was mentioned, discussed, or observed by the user.
- Confirmed: The vulnerability has been validated from an analyst's perspective.
- Published Proof of Concept: A public proof of concept is available for this vulnerability.
- Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
- Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
- Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
- Not confirmed: The user expressed doubt about the validity of the vulnerability.
- Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.
Vulnerability timeline
Sightings and recorded dates, grouped by day · UTC
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The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the
vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base
model, served locally by ML-Gateway.
They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
Browse all ATT&CK techniques and the vulnerabilities related to each.
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Related by attack behaviour
Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.