CVE-2023-52649

Out-of-bounds read via unguarded LUT ceiling index

Published May 1, 2024 · Updated May 11, 2026

Out-of-bounds read in the Linux kernel's VKMS driver introduced in 6.6 allows local users to read past a color lookup table. VKMS interpolation computes the ceiling LUT slot after the floor calculation even when the floor slot is the array's final entry, then dereferences the resulting out-of-range slot. Reachability requires local low-privileged access to a kernel with VKMS enabled; the published record establishes an over-read but not a specific disclosure or crash.

CVSS severity7.8
High
EPSS probability0.28%
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's VKMS driver introduced in 6.6 allows local users to read past a color lookup table. VKMS interpolation computes the ceiling LUT slot after the floor calculation even when the floor slot is the array's final entry, then dereferences the resulting out-of-range slot. Reachability requires local low-privileged access to a kernel with VKMS enabled; the published record establishes an over-read but not a specific disclosure or crash.

The record

CVE
CVE-2023-52649
Published
May 1, 2024
Updated
May 11, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
CWE-129, CAPEC-100
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 1, 2024CVE publishedPublication date reported by the CVE source.
  2. May 11, 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=6.6
  2. Affected versionversion=db1f254f2cfaf0510ae34fa2311a8d749e95179a <046c1184ce60b0a37d48134f17ddbc1f32ce02bd
  3. Affected versionversion=db1f254f2cfaf0510ae34fa2311a8d749e95179a <2fee84030d12d9fddfa874e4562d71761a129277
  4. Affected versionversion=db1f254f2cfaf0510ae34fa2311a8d749e95179a <92800aaeff51b8358d1e0a7eb74daf8aa2d7ce9d
  5. Affected versionversion=db1f254f2cfaf0510ae34fa2311a8d749e95179a <9556c167673057d48ce4a0da675026fe046654c1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=6.6; version=db1f254f2cfaf0510ae34fa2311a8d749e95179a <046c1184ce60b0a37d48134f17ddbc1f32ce02bd; version=db1f254f2cfaf0510ae34fa2311a8d749e95179a <2fee84030d12d9fddfa874e4562d71761a129277; version=db1f254f2cfaf0510ae34fa2311a8d749e95179a <92800aaeff51b8358d1e0a7eb74daf8aa2d7ce9d; version=db1f254f2cfaf0510ae34fa2311a8d749e95179a <9556c167673057d48ce4a0da675026fe046654c1

Published CVSS scores

5.5Oracle LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
7.8NVDCVSS: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.

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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-129Improper Validation of Array Index
CAPEC-100Overflow Buffers

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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