CVE-2026-72319Network attack vector

Kernel memory access via truncated tunneled ICMP errors

Published Aug 15, 2026 · Updated Aug 15, 2026

Out-of-bounds access in Linux IPVS allows remote attackers to access invalid kernel memory via tunneled ICMP errors. ip_vs_in_icmp() strips outer headers with pskb_pull() but passes inner headers to ipv4_update_pmtu(), icmp_send(), and debug paths without first pulling their full lengths into linear skb headroom. Reachability requires IPVS tunnel forwarding and a crafted ICMP error containing a truncated or non-linear quoted packet; the published record does not establish a specific post-access consequence.

CVSS severity9.8
Critical
EPSS probability0.74%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds access in Linux IPVS allows remote attackers to access invalid kernel memory via tunneled ICMP errors. ip_vs_in_icmp() strips outer headers with pskb_pull() but passes inner headers to ipv4_update_pmtu(), icmp_send(), and debug paths without first pulling their full lengths into linear skb headroom. Reachability requires IPVS tunnel forwarding and a crafted ICMP error containing a truncated or non-linear quoted packet; the published record does not establish a specific post-access consequence.

The record

CVE
CVE-2026-72319
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1190
Attack vector
network
Privileges
unauthenticated

Timeline

How it unfolded

  1. Aug 15, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 15, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=3.7
  2. Affected versionversion=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <19657b3a17b774ae4e2f2635b5ae8638c9344a40
  3. Affected versionversion=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <3f7a535ff0fa627a0132803e4c2f903ceffcbc1c
  4. Affected versionversion=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <8f48cfe657409fb5c7ba0521b14da6d47546d9cf
  5. Affected versionversion=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <92185d6f7819bc558939ae83de7b1abe90e3b5c2
  6. Affected versionversion=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <9bc9b95aee2b2e3f1301a16a67ee504960402875
  7. Affected versionversion=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <a735f9964a3d9ed97daf9b08507f8b5bcafe6326
  8. Affected versionversion=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <dac813101914c21219ac221a60a31a11bc90e7ec
  9. Affected versionversion=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <dd22f74a09e25ca298ced0a3763ef353242cb78d

What conditions does exploitation require?

Attack vectornetwork
Required privilegesunauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=3.7; version=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <19657b3a17b774ae4e2f2635b5ae8638c9344a40; version=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <3f7a535ff0fa627a0132803e4c2f903ceffcbc1c; version=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <8f48cfe657409fb5c7ba0521b14da6d47546d9cf; version=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <92185d6f7819bc558939ae83de7b1abe90e3b5c2; version=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <9bc9b95aee2b2e3f1301a16a67ee504960402875; version=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <a735f9964a3d9ed97daf9b08507f8b5bcafe6326; version=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <dac813101914c21219ac221a60a31a11bc90e7ec; version=f2edb9f7706dcb2c0d9a362b2ba849efe3a97f5e <dd22f74a09e25ca298ced0a3763ef353242cb78d

Published CVSS scores

9.8LinuxCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectornetwork
Privilegesunauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1190Exploit Public-Facing Application

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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