Distribution advisory
This page covers CVE-2025-29943 as tracked by Ubuntu, for the package amd64-microcode. The fix is available in version 3.20251202.1ubuntu1; earlier versions remain affected.
How this vulnerability can be exploited
This issue can be reached with local access to the system, attack complexity is low, an attacker needs administrative privileges on the target. No user interaction is required. Rated impact: confidentiality none, integrity none, availability none.
CVSS metrics in full
The score comes from this vector: CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:N/VA:N/SC:N/SI:L/SA:N
- Attack vector: Local — a local account, shell or session on the host is needed.
- Attack complexity: Low — the attack works reliably, with no preparation.
- Attack requirements: None — no deployment-specific condition has to hold.
- Privileges required: High — administrative rights are needed first.
- User interaction: None — nobody has to be tricked into anything.
- Confidentiality impact: None.
- Integrity impact: None.
- Availability impact: None.
Weakness class
UBUNTU-CVE-2025-29943 is classified as CWE-123: Write-what-where Condition. Any condition where the attacker has the ability to write an arbitrary value to an arbitrary location, often as the result of a buffer overflow.
Affected software
UBUNTU-CVE-2025-29943 is recorded against 1 package.
- amd64-microcode (fixed in 3.20251202.1ubuntu1)
Timeline and source
Published on 16 January 2026 and last revised on 25 June 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.
References
ubuntu.com (Report)
www.cve.org (Report)
www.amd.com (Report)
Other advisories for this package
amd64-microcode has other advisories on record. If you are patching this one, these are worth checking on the same host:
Same weakness in other software
These advisories are the same class of weakness (CWE-123: Write-what-where Condition) in other software:
