In the Linux kernel, the following vulnerability has been resolved: fbcon: Avoid OOB font access if console rotation fails Clear the font buffer if… (CVE-2026-46191)
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
AI Analysis
Technical Summary
The Linux kernel fbcon subsystem had a vulnerability where the font buffer was not properly cleared if console rotation failed during fbcon_rotate_font(). The old, smaller font buffer remained in use, allowing out-of-bounds access when printing characters with sufficiently high character codes. The fix involves clearing the font buffer upon reallocation failure and ensuring putcs implementations return early to avoid overflow. This resolves the risk of font buffer overflow caused by console rotation failures.
Potential Impact
Successful exploitation could lead to a high-severity impact with potential confidentiality loss and availability disruption, as indicated by the CVSS vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H). The vulnerability allows out-of-bounds access to the font buffer, which may cause system instability or information disclosure related to the framebuffer console.
Mitigation Recommendations
A fix is available in Linux kernel versions 6.8.0-1061.64~22.04.1 and later. Users should upgrade to these or newer patched kernel versions to mitigate this vulnerability. Since this is a kernel-level issue, applying the official kernel updates from the vendor is the recommended remediation.
In the Linux kernel, the following vulnerability has been resolved: fbcon: Avoid OOB font access if console rotation fails Clear the font buffer if… (CVE-2026-46191)
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
CVSS v3.1
Score 7.1high
Affected software
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protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resolutepkg:deb/ubuntu/[email protected]?arch=source&distro=resoluteRun on your own infrastructure? Check whether these packages are installed with threat-finder — our free open-source scanner.
AI-Powered Analysis
Machine-generated threat intelligence
Technical Analysis
The Linux kernel fbcon subsystem had a vulnerability where the font buffer was not properly cleared if console rotation failed during fbcon_rotate_font(). The old, smaller font buffer remained in use, allowing out-of-bounds access when printing characters with sufficiently high character codes. The fix involves clearing the font buffer upon reallocation failure and ensuring putcs implementations return early to avoid overflow. This resolves the risk of font buffer overflow caused by console rotation failures.
Potential Impact
Successful exploitation could lead to a high-severity impact with potential confidentiality loss and availability disruption, as indicated by the CVSS vector (AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H). The vulnerability allows out-of-bounds access to the font buffer, which may cause system instability or information disclosure related to the framebuffer console.
Mitigation Recommendations
A fix is available in Linux kernel versions 6.8.0-1061.64~22.04.1 and later. Users should upgrade to these or newer patched kernel versions to mitigate this vulnerability. Since this is a kernel-level issue, applying the official kernel updates from the vendor is the recommended remediation.
Technical Details
- Gcve Source
- db.gcve.eu
- Osv Id
- UBUNTU-CVE-2026-46191
- Osv Schema Version
- 1.7.0
- Aliases
- []
- Ecosystems
- ["Ubuntu:Pro:14.04:LTS","Ubuntu:Pro:16.04:LTS","Ubuntu:16.04:LTS","Ubuntu:Pro:FIPS:16.04:LTS","Ubuntu:Pro:18.04:LTS","Ubuntu:18.04:LTS","Ubuntu:Pro:FIPS-updates:18.04:LTS","Ubuntu:Pro:FIPS:18.04:LTS","Ubuntu:Pro:20.04:LTS","Ubuntu:20.04:LTS","Ubuntu:Pro:FIPS-updates:20.04:LTS","Ubuntu:Pro:FIPS:20.04:LTS","Ubuntu:22.04:LTS","Ubuntu:Nvidia-BlueField:22.04:LTS","Ubuntu:Pro:FIPS-preview:22.04:LTS","Ubuntu:Pro:FIPS-updates:22.04:LTS","Ubuntu:Pro:Realtime:22.04:LTS","Ubuntu:24.04:LTS","Ubuntu:Nvidia-BlueField:24.04:LTS","Ubuntu:Pro:FIPS-updates:24.04:LTS","Ubuntu:Pro:Realtime:24.04:LTS","Ubuntu:25.10","Ubuntu:26.04:LTS"]
- Database Specific Severity
- null
- Cvss Version
- 3.1
Threat ID: 6a5a01cd91ae9bcd3f828559
Added to database: 07/17/2026, 10:19:57 UTC
Last enriched: 07/30/2026, 14:37:56 UTC
Last updated: 07/31/2026, 19:30:21 UTC
Views: 2
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