CVE-2026-64318

Kernel memory disclosure and crash via oversized pp_count

Published Jul 25, 2026 · Updated Jul 25, 2026

Out-of-bounds read in the Linux Kernel AIX partition parser allows local users to disclose kernel memory or crash the system via a crafted image. aix_partition() trusts the on-disk pp_count and scans beyond the fixed 1,016-entry ppe array, reading up to roughly 2 MiB past its allocation. A basic local desktop user can trigger scanning through an unprivileged UDisks loop setup; the flaw provides no out-of-bounds write primitive.

CVSS severity7.1
High
EPSS probability0.16%
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 read in the Linux Kernel AIX partition parser allows local users to disclose kernel memory or crash the system via a crafted image. aix_partition() trusts the on-disk pp_count and scans beyond the fixed 1,016-entry ppe array, reading up to roughly 2 MiB past its allocation. A basic local desktop user can trigger scanning through an unprivileged UDisks loop setup; the flaw provides no out-of-bounds write primitive.

The record

CVE
CVE-2026-64318
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
T1499.004
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 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=3.11
  2. Affected versionversion=6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <09861651617ba0fec089e8b9477439e68398c110
  3. Affected versionversion=6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <2dc0bfd2fe355fb930de63c2f2eb8ced8570c579
  4. Affected versionversion=6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <44f37ee92fdcd377c41bdf6a31cdd8cc7d4c410e
  5. Affected versionversion=6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <4671bb74bba05fdd4acf670a35758c29e8c97b83
  6. Affected versionversion=6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <5eacdb1967378f5e5591cd27a2d8cdee2df1a599
  7. Affected versionversion=6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <b5e9c09309e18fd9839ad007c238120353ca0cc4
  8. Affected versionversion=6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <ce93228e2193a17d2c58b656e439bb39fe5c3af8
  9. Affected versionversion=6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <fd94a779020f2ecc8b2607f4c20b34acb1763b9a

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3.11; version=6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <09861651617ba0fec089e8b9477439e68398c110; version=6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <2dc0bfd2fe355fb930de63c2f2eb8ced8570c579; version=6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <44f37ee92fdcd377c41bdf6a31cdd8cc7d4c410e; version=6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <4671bb74bba05fdd4acf670a35758c29e8c97b83; version=6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <5eacdb1967378f5e5591cd27a2d8cdee2df1a599; version=6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <b5e9c09309e18fd9839ad007c238120353ca0cc4; version=6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <ce93228e2193a17d2c58b656e439bb39fe5c3af8; version=6ceea22bbbc84fcf6bf0913bb3db8a657e9002f6 <fd94a779020f2ecc8b2607f4c20b34acb1763b9a

Published CVSS scores

7.1kernel.orgCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

T1499.004Endpoint Denial of Service: Application or System Exploitation

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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