CVE-2026-74747Hinoki check available

Local privilege escalation via mutable IP header

Published Aug 26, 2026 · Updated Aug 27, 2026

Out-of-bounds access in the Linux IPVS subsystem allows local users to corrupt kernel memory through ICMP NAT packet handling. Within ip_vs_nat_icmp(), skb_ensure_writable() validates one embedded IPv4 header length, but ip_send_check() rereads a locally mutable IHL and accesses beyond that bound. Exploitation requires a local low-privileged process and an IPVS NAT configuration; consequences include kernel-memory disclosure, a kernel panic, or privilege escalation.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkAvailable
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Summary

What happened

Out-of-bounds access in the Linux IPVS subsystem allows local users to corrupt kernel memory through ICMP NAT packet handling. Within ip_vs_nat_icmp(), skb_ensure_writable() validates one embedded IPv4 header length, but ip_send_check() rereads a locally mutable IHL and accesses beyond that bound. Exploitation requires a local low-privileged process and an IPVS NAT configuration; consequences include kernel-memory disclosure, a kernel panic, or privilege escalation.

The record

CVE
CVE-2026-74747
Published
Aug 26, 2026
Updated
Aug 27, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 26, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 27, 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5365f012451fce2453f13a568dcb72ea534c1e4d
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d93660df4dd1d116f608ada4a29a80a5d6f0a6ed
  3. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5365f012451fce2453f13a568dcb72ea534c1e4d; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <d93660df4dd1d116f608ada4a29a80a5d6f0a6ed; version=2.6.12

Published CVSS scores

7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

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

Weakness, pattern, technique

T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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