CVE-2026-74724

Local kernel memory corruption via IPVS header race

Published Aug 22, 2026 · Updated Aug 25, 2026

Out-of-bounds write in Linux kernel IPVS allows local users to corrupt kernel memory through an IPv4 header race. The ip_vs_nat_icmp path validates an embedded IPv4 header length, then rereads the mutable IHL field and uses it to write transport ports and update the checksum beyond the ensured writable area. Exploitation requires local packet-buffer access and configured IPVS NAT; successful corruption can disclose data, hijack control flow, or panic the kernel.

CVSS severity7.8
High
EPSS probability0.12%
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 write in Linux kernel IPVS allows local users to corrupt kernel memory through an IPv4 header race. The ip_vs_nat_icmp path validates an embedded IPv4 header length, then rereads the mutable IHL field and uses it to write transport ports and update the checksum beyond the ensured writable area. Exploitation requires local packet-buffer access and configured IPVS NAT; successful corruption can disclose data, hijack control flow, or panic the kernel.

The record

CVE
CVE-2026-74724
Published
Aug 22, 2026
Updated
Aug 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Aug 22, 2026CVE publishedPublication date reported by the CVE source.
  2. Aug 25, 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 <243d0187ec4c3837b9b0004f18d1068e46115760
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3b8f79af0e98f27b932b0b416e9c52b692d31ff9
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3c779b258c9c3c3567af68d4f45c2f751f35bd0e
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <646922a0379496154e8c8faca4f8e2fd9100cacc
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a69a4b3fff5814d079beff9a1e9d369994b2ed47
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <be65fa324640c7a95e30b146159a2be5cc73f22e
  7. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <243d0187ec4c3837b9b0004f18d1068e46115760; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3b8f79af0e98f27b932b0b416e9c52b692d31ff9; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <3c779b258c9c3c3567af68d4f45c2f751f35bd0e; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <646922a0379496154e8c8faca4f8e2fd9100cacc; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <a69a4b3fff5814d079beff9a1e9d369994b2ed47; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <be65fa324640c7a95e30b146159a2be5cc73f22e; 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

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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)
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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