CVE-2026-74404

Kernel memory corruption via reserved-region bounds error

Published Aug 15, 2026 · Updated Aug 15, 2026

A heap buffer overflow in Linux kernel 6.9 allows local users to corrupt kernel memory via an SEV-SNP reserved-memory layout. snp_filter_reserved_mem_regions() checks only previously stored entries, then writes base and page_count for a 256th entry beyond its PAGE_SIZE allocation. Reachability requires an AMD SEV-SNP host and enough reserved-memory regions; resulting kernel memory corruption can crash the host or expose and alter protected data.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

A heap buffer overflow in Linux kernel 6.9 allows local users to corrupt kernel memory via an SEV-SNP reserved-memory layout. snp_filter_reserved_mem_regions() checks only previously stored entries, then writes base and page_count for a 256th entry beyond its PAGE_SIZE allocation. Reachability requires an AMD SEV-SNP host and enough reserved-memory regions; resulting kernel memory corruption can crash the host or expose and alter protected data.

The record

CVE
CVE-2026-74404
Published
Aug 15, 2026
Updated
Aug 15, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
Unavailable
Attack vector
local
Privileges
authenticated

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=1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2 <1b864b6cb213bbd7b406e9b2e98c962077f300df
  2. Affected versionversion=1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2 <830c1f3e71989448652973375ef5e39b6ede47a3
  3. Affected versionversion=1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2 <af7341616b742ad2c374a90998bd650a035f694d
  4. Affected versionversion=1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2 <c5c79d92da0f9a09f48be5e2aabed2d6d1a96294
  5. Affected versionversion=6.9

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2 <1b864b6cb213bbd7b406e9b2e98c962077f300df; version=1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2 <830c1f3e71989448652973375ef5e39b6ede47a3; version=1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2 <af7341616b742ad2c374a90998bd650a035f694d; version=1ca5614b84eed5904f65f143e0e7aaab0ac4c6b2 <c5c79d92da0f9a09f48be5e2aabed2d6d1a96294; version=6.9

Published CVSS scores

7.8Canonical UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
3.0Amazon LinuxCVSS:3.1/AV:L/AC:H/PR:H/UI:N/S:U/C:N/I:L/A:L

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 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

No sourced classifications are available.

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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