CVE-2026-52969

Local kernel memory corruption via wrapped dirty-ring offset

Published Jun 24, 2026 · Updated Jun 24, 2026

Integer overflow in Linux Kernel KVM allows local users with /dev/kvm access to perform an out-of-bounds kernel-memory load. kvm_reset_dirty_gfn() adds an attacker-controlled dirty-ring offset to the highest mask bit without first validating the offset, so unsigned wrap bypasses the memslot bounds check and sends a near-U64_MAX GFN into gfn_to_rmap(). Reachability requires the legacy MMU path, such as shadow paging or a write-tracked slot; a nonzero loaded pointer receives an unintended writable-bit clear.

CVSS severity7.8
High
EPSS probability0.15%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Integer overflow in Linux Kernel KVM allows local users with /dev/kvm access to perform an out-of-bounds kernel-memory load. kvm_reset_dirty_gfn() adds an attacker-controlled dirty-ring offset to the highest mask bit without first validating the offset, so unsigned wrap bypasses the memslot bounds check and sends a near-U64_MAX GFN into gfn_to_rmap(). Reachability requires the legacy MMU path, such as shadow paging or a write-tracked slot; a nonzero loaded pointer receives an unintended writable-bit clear.

The record

CVE
CVE-2026-52969
Published
Jun 24, 2026
Updated
Jun 24, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-190, CWE-129, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 24, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 24, 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=5.11
  2. Affected versionversion=fb04a1eddb1a65b6588a021bdc132270d5ae48bb <01b71b930f15728aa8599478a7ce90c19dcd9fc2
  3. Affected versionversion=fb04a1eddb1a65b6588a021bdc132270d5ae48bb <0d419c23bb11b5c9664de777c47c1f04a235882d
  4. Affected versionversion=fb04a1eddb1a65b6588a021bdc132270d5ae48bb <0eb281eb95b2d4eea4db1da5fe91023aecc97095
  5. Affected versionversion=fb04a1eddb1a65b6588a021bdc132270d5ae48bb <577a8d3bae0531f0e5ccfac919cd8192f920a804
  6. Affected versionversion=fb04a1eddb1a65b6588a021bdc132270d5ae48bb <74f1a22f7a80f03d28ad8551a2d25d563433addf
  7. Affected versionversion=fb04a1eddb1a65b6588a021bdc132270d5ae48bb <b315b033a877b1ee6d827810b5d7bb4392ffcf8d
  8. Affected versionversion=fb04a1eddb1a65b6588a021bdc132270d5ae48bb <ecf9b3ea7847fe14f34b8c41f00de1eb95c747da

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.11; version=fb04a1eddb1a65b6588a021bdc132270d5ae48bb <01b71b930f15728aa8599478a7ce90c19dcd9fc2; version=fb04a1eddb1a65b6588a021bdc132270d5ae48bb <0d419c23bb11b5c9664de777c47c1f04a235882d; version=fb04a1eddb1a65b6588a021bdc132270d5ae48bb <0eb281eb95b2d4eea4db1da5fe91023aecc97095; version=fb04a1eddb1a65b6588a021bdc132270d5ae48bb <577a8d3bae0531f0e5ccfac919cd8192f920a804; version=fb04a1eddb1a65b6588a021bdc132270d5ae48bb <74f1a22f7a80f03d28ad8551a2d25d563433addf; version=fb04a1eddb1a65b6588a021bdc132270d5ae48bb <b315b033a877b1ee6d827810b5d7bb4392ffcf8d; version=fb04a1eddb1a65b6588a021bdc132270d5ae48bb <ecf9b3ea7847fe14f34b8c41f00de1eb95c747da

Published CVSS scores

7.8NIST National Vulnerability DatabaseCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.3Amazon LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/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)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-190Integer Overflow or Wraparound
CWE-129Improper Validation of Array Index
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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