VulnerabilityPublished 24 Jul 2026Updated 27 Oct 2026

CVE-2025-21709: linux-aws vulnerabilities

Affects Linux kernelSource GCVE Database

Mentioned vulnerabilities

Not known to be exploited : upgrade to 6.8.0-1061.64 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 6.8.0-1061.64

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-8595-2

What to do

Upgrade the Ubuntu linux-aws package to 6.8.0-1061.64.

Patches and advisories

ubuntu.com/security/notices/USN-8595-2 (opens in a new tab)

Affected software

Product	Affected	Fixed in
Ubuntu 24.04 LTSlinux-aws`pkg:deb/ubuntu/linux-aws?arch=source&distro=noble`Other threats	Affected <6.8.0-1061.64	Fixed in 6.8.0-1061.64

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

AI-suggested

A patch addressing these vulnerabilities is available in linux-aws kernel version 6.8.0-1061.64. Users should update their systems to this version or later and reboot to apply the fixes. Due to an ABI change, recompilation and reinstallation of third-party kernel modules are required after the update. Follow the official Ubuntu security notice USN-8595-2 for detailed update instructions.

Description

Multiple security vulnerabilities affecting the linux-aws kernel for Ubuntu 24.04 LTS were discovered, including issues in AMD processors related to speculative execution, resource isolation, and entropy generation. Additionally, numerous flaws across various Linux kernel subsystems and drivers were identified that could allow local attackers to compromise system integrity or confidentiality. These issues have been addressed in kernel version 6.8.0-1061.64 and later.

Impact

Local attackers could exploit these vulnerabilities to expose sensitive information, escalate privileges, or compromise system confidentiality and integrity. The AMD processor flaws affect speculative execution data clearing, resource isolation, and entropy generation, which can lead to information leakage or privilege escalation. The broad kernel subsystem vulnerabilities could allow attackers to compromise the system in various ways depending on the specific flaw.

Summary

This security advisory covers several vulnerabilities in the linux-aws kernel, notably: CVE-2025-54505 where some AMD processors fail to clear data in the floating point divider unit during speculative execution, potentially exposing sensitive information; CVE-2025-54518 involving AMD Zen 2 processors that do not properly isolate shared resources in the operation cache, possibly enabling privilege escalation; and CVE-2025-62626 where AMD Zen 5 processors with RDSEED instruction mishandle entropy, risking confidentiality and integrity loss. Beyond these CPU-specific issues, a wide range of security flaws were fixed across many Linux kernel subsystems and drivers, including architectures (ARM64, RISC-V, S390, x86), device drivers, filesystems, networking, and kernel core components. The fixes are included in linux-aws kernel version 6.8.0-1061.64 and later.

References

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