CyberSecBulletin
CVE-2026-46191NVD status: Modified

Linux: Out-of-bounds Read

Published Updated By the CyberSecBulletin desk

CVE-2026-46191 is a high-severity out-of-bounds read vulnerability in Linux, with a CVSS 3.1 base score of 7.1 out of 10. It can be exploited with local access to the system by an attacker with a low-privileged account, without any action from a user. The record lists versions b51c343a81e6e806525a4435e22532c107dd7e9d, 46cf3646dea54baeaa2eafe3fb1ba769947f31b0, 524a6079395916fb3d790ef2bb46a1d2939b27dd as the first without the flaw, so updating Linux to one of those releases or later removes the exposure. There is no confirmed exploitation so far. EPSS estimates a 0.14% chance of exploitation within 30 days, which is low compared with other CVEs.

Next patch cycle

High severity with no evidence of exploitation so far.

What to do

  1. Update Linux to b51c343a81e6e806525a4435e22532c107dd7e9d or 46cf3646dea54baeaa2eafe3fb1ba769947f31b0 or 524a6079395916fb3d790ef2bb46a1d2939b27dd or 594973a2e54924d8ba31c9faac669fc1ba6fcb80, whichever matches your release line, or a later version.
  2. Update Linux Kernel to 6.6.140 or 6.12.90 or 6.18.32 or 7.0.7, whichever matches your release line, or a later version.

Affected products and versions

VendorProductAffected versionsFixed in
LinuxLinux6cc50e1c5b57180fd37a31282000f43859b0fe73 up to, but not including, b51c343a81e6e806525a4435e22532c107dd7e9d; 6cc50e1c5b57180fd37a31282000f43859b0fe73 up to, but not including, 46cf3646dea54baeaa2eafe3fb1ba769947f31b0; 6cc50e1c5b57180fd37a31282000f43859b0fe73 up to, but not including, 524a6079395916fb3d790ef2bb46a1d2939b27dd; 6cc50e1c5b57180fd37a31282000f43859b0fe73 up to, but not including, 594973a2e54924d8ba31c9faac669fc1ba6fcb80; 6cc50e1c5b57180fd37a31282000f43859b0fe73 up to, but not including, ab6c34b9829d5de03f1d08a47a2253729a6e7e27; 6cc50e1c5b57180fd37a31282000f43859b0fe73 up to, but not including, 7105d9f1387d63b15c9a860674fc92c959181f2f; 6cc50e1c5b57180fd37a31282000f43859b0fe73 up to, but not including, b44cc78ff46b96e72d333a3be6aaaa0a14797263; 6cc50e1c5b57180fd37a31282000f43859b0fe73 up to, but not including, e4ef723d8975a2694cc90733a6b888a5e2841842; and 1 more rangesb51c343a81e6e806525a4435e22532c107dd7e9d, 46cf3646dea54baeaa2eafe3fb1ba769947f31b0, 524a6079395916fb3d790ef2bb46a1d2939b27dd, 594973a2e54924d8ba31c9faac669fc1ba6fcb80, ab6c34b9829d5de03f1d08a47a2253729a6e7e27, 7105d9f1387d63b15c9a860674fc92c959181f2f
SiemensSIMATIC S7-1500 TM MFP - GNU/Linux subsystemall versionsNot stated
LinuxLinux Kernel2.6.15 up to, but not including, 6.6.140; 6.7 up to, but not including, 6.12.90; 6.13 up to, but not including, 6.18.32; 6.19 up to, but not including, 7.0.76.6.140, 6.12.90, 6.18.32, 7.0.7

Version data comes from the organisation that assigned the CVE. Confirm against the vendor advisory before deciding you are unaffected.

How the severity score breaks down

Attack vector
LocalThe attacker needs local access or must trick a user into running something.
Attack complexity
LowNo special conditions are needed; the attack works reliably.
Privileges required
LowA basic user account is enough.
User interaction
NoneNo action by a victim is required.
Scope
UnchangedImpact stays within the vulnerable component.
Confidentiality
HighAll data handled by the component can be read.
Integrity
NoneNothing can be modified.
Availability
HighThe component can be taken down completely.

Vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H. Scored by NVD.

Official description

In the Linux kernel, the following vulnerability has been resolved: fbcon: Avoid OOB font access if console rotation fails Clear the font buffer if the reallocation during console rotation fails in fbcon_rotate_font(). The putcs implementations for the rotated buffer will return early in this case. See [1] for an example. Currently, fbcon_rotate_font() keeps the old buffer, which is too small for the rotated font. Printing to the rotated console with a high-enough character code will overflow the font buffer. v2: - fix typos in commit message

Source: the CVE record as published by its numbering authority, via NVD and CVE.org.

The underlying weakness: Out-of-bounds Read

The product reads data past the end, or before the beginning, of the intended buffer.

How developers prevent this class of flaw

  • Use a language that provides appropriate memory abstractions.

More Out-of-bounds Read vulnerabilities (CWE-125)

Timeline

  1. CVE record published.
  2. CISA published its SSVC assessment (exploitation: none, automatable: no, technical impact: partial).
  3. Record last changed materially (score, affected products, status or references).

References

Recent Out-of-bounds Read vulnerabilities

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