VulnerabilityPublished 24 Jul 2026Updated 27 Oct 2026

CVE-2025-21709: linux-azure-fips vulnerabilities

Affects Linux kernelSource GCVE Database

Mentioned vulnerabilities

Not known to be exploited : upgrade to 6.8.0-1063.71+fips2 soon.

Data as of 28 Oct 2026, 05:11 UTC

Severity

High

Rated High by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

EPSS: 0.2% chance of exploitation in 30 days – higher than 9% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 6.8.0-1063.71+fips2

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

usn-8608-1

What to do

Upgrade the Ubuntu linux-azure-fips package to 6.8.0-1063.71+fips2.

Patches and advisories

ubuntu.com/security/notices/USN-8608-1 (opens in a new tab)

Affected software

Product	Affected	Fixed in
Ubuntu Pro FIPS-updates 24.04 LTSlinux-azure-fips`pkg:deb/ubuntu/linux-azure-fips?arch=source&distro=fips-updates/noble`Other threats	Affected <6.8.0-1063.71+fips2	Fixed in 6.8.0-1063.71+fips2

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available and users should update to linux-azure-fips version 6.8.0-1063.71+fips2 or later. After updating, a system reboot is required to apply all changes. Due to an ABI change in the kernel update, all third-party kernel modules must be recompiled and reinstalled. Follow the vendor advisory at https://ubuntu.com/security/notices/USN-8608-1 for detailed update instructions.

Description

Multiple security vulnerabilities were discovered in the linux-azure-fips kernel affecting various AMD processors and numerous Linux kernel subsystems. These include speculative execution data leakage, privilege escalation via cache resource isolation flaws, and entropy issues in RDSEED instruction handling. The update addresses these issues and many others across a wide range of kernel components and drivers. Affected systems should update to the fixed kernel version to mitigate potential system compromise.

Impact

Local attackers could exploit these vulnerabilities to expose sensitive information, escalate privileges, and compromise system confidentiality and integrity. The flaws affect speculative execution, cache resource isolation, and entropy generation, which can lead to information leakage and privilege escalation. Additionally, the broad range of kernel subsystems affected increases the risk of system compromise if unpatched.

References

Community reviews

Loading reviews…