CVE-2026-46191

Memory disclosure and crash via stale font buffer

Published May 28, 2026 · Updated May 28, 2026

Out-of-bounds access in affected Linux Kernel versions allows local users to disclose kernel memory or crash the system. During console rotation, fbcon_rotate_font() retains the old font buffer when reallocation fails, although that buffer is too small for the rotated font. A low-privileged local user must reach a rotated framebuffer console after allocation failure and print a sufficiently high character code; no memory modification impact is reported.

CVSS severity7.1
High
EPSS probability0.13%
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 access in affected Linux Kernel versions allows local users to disclose kernel memory or crash the system. During console rotation, fbcon_rotate_font() retains the old font buffer when reallocation fails, although that buffer is too small for the rotated font. A low-privileged local user must reach a rotated framebuffer console after allocation failure and print a sufficiently high character code; no memory modification impact is reported.

The record

CVE
CVE-2026-46191
Published
May 28, 2026
Updated
May 28, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1499.004, T1005
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 28, 2026CVE publishedPublication date reported by the CVE source.
  2. May 28, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=2.6.15
  2. Affected versionversion=6cc50e1c5b57180fd37a31282000f43859b0fe73 <594973a2e54924d8ba31c9faac669fc1ba6fcb80
  3. Affected versionversion=6cc50e1c5b57180fd37a31282000f43859b0fe73 <7105d9f1387d63b15c9a860674fc92c959181f2f
  4. Affected versionversion=6cc50e1c5b57180fd37a31282000f43859b0fe73 <ab6c34b9829d5de03f1d08a47a2253729a6e7e27
  5. Affected versionversion=6cc50e1c5b57180fd37a31282000f43859b0fe73 <b44cc78ff46b96e72d333a3be6aaaa0a14797263
  6. Affected versionversion=6cc50e1c5b57180fd37a31282000f43859b0fe73 <e4ef723d8975a2694cc90733a6b888a5e2841842

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=2.6.15; version=6cc50e1c5b57180fd37a31282000f43859b0fe73 <594973a2e54924d8ba31c9faac669fc1ba6fcb80; version=6cc50e1c5b57180fd37a31282000f43859b0fe73 <7105d9f1387d63b15c9a860674fc92c959181f2f; version=6cc50e1c5b57180fd37a31282000f43859b0fe73 <ab6c34b9829d5de03f1d08a47a2253729a6e7e27; version=6cc50e1c5b57180fd37a31282000f43859b0fe73 <b44cc78ff46b96e72d333a3be6aaaa0a14797263; version=6cc50e1c5b57180fd37a31282000f43859b0fe73 <e4ef723d8975a2694cc90733a6b888a5e2841842

Published CVSS scores

7.1NIST NVDCVSS: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.

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

CWE-125Out-of-bounds Read
T1499.004Application or System Exploitation
T1005Data from Local System

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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