SUSE-SU-2026:21981-1: important: Security update for ovmf

[SLE-SECURITY-UPDATES]

# Security update for ovmf

Announcement ID: SUSE-SU-2026:21981-1  
Release Date: 2026-06-02T09:33:25Z  
Rating: important  
References:

  * bsc#1261469
  * bsc#1261476
  * bsc#1261477
  * bsc#1261478

  
Cross-References:

  * CVE-2026-25833
  * CVE-2026-25834
  * CVE-2026-25835
  * CVE-2026-34874

  
CVSS scores:

  * CVE-2026-25833 ( SUSE ):  8.7
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-25833 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-25833 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-25834 ( SUSE ):  6.9
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:L/VI:N/VA:L/SC:N/SI:N/SA:N
  * CVE-2026-25834 ( SUSE ):  6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:L
  * CVE-2026-25834 ( NVD ):  6.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:L/A:L
  * CVE-2026-25835 ( SUSE ):  8.5
    CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:H/VI:H/VA:N/SC:N/SI:N/SA:N
  * CVE-2026-25835 ( SUSE ):  7.7 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
  * CVE-2026-25835 ( NVD ):  7.7 CVSS:3.1/AV:L/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:N
  * CVE-2026-34874 ( SUSE ):  8.7
    CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N
  * CVE-2026-34874 ( SUSE ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
  * CVE-2026-34874 ( NVD ):  7.5 CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

  
Affected Products:

  * SUSE Linux Micro 6.2

  
  
An update that solves four vulnerabilities can now be installed.

## Description:

This update for ovmf fixes the following issues:

  * CVE-2026-25833: mbedtls: buffer overflow in the `x509_inet_pton_ipv6()`
    function (bsc#1261476).
  * CVE-2026-25834: mbedtls: client accepts signature algorithm chosen by server
    even if not advertised in client hello (bsc#1261477).
  * CVE-2026-25835: mbedtls: no pseudo-random number generator reseed when
    cloning an application (bsc#1261478).
  * CVE-2026-34874: mbedtls: NULL pointer dereference in distinguished name
    parsing (bsc#1261469).

## Patch Instructions:

To install this SUSE update use the SUSE recommended installation methods like
YaST online_update or "zypper patch".  
Alternatively you can run the command listed for your product:

  * SUSE Linux Micro 6.2  
    zypper in -t patch SUSE-SL-Micro-6.2-865=1

## Package List:

  * SUSE Linux Micro 6.2 (noarch)
    * qemu-ovmf-x86_64-202502-160000.5.1
    * qemu-uefi-aarch64-202502-160000.5.1

## References:

  * https://www.suse.com/security/cve/CVE-2026-25833.html
  * https://www.suse.com/security/cve/CVE-2026-25834.html
  * https://www.suse.com/security/cve/CVE-2026-25835.html
  * https://www.suse.com/security/cve/CVE-2026-34874.html
  * https://bugzilla.suse.com/show_bug.cgi?id=1261469
  * https://bugzilla.suse.com/show_bug.cgi?id=1261476
  * https://bugzilla.suse.com/show_bug.cgi?id=1261477
  * https://bugzilla.suse.com/show_bug.cgi?id=1261478

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