VulnerabilityPublished 19 Nov 2025Updated 30 Oct 2026

CVE-2025-37838: linux-aws-6.8 vulnerabilities

Affects Linux kernelSource GCVE Database

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Mentioned vulnerabilities

CVE-2025-40300

Not known to be exploited : upgrade to 6.8.0-1042.44~22.04.1 soon.

Data as of 31 Oct 2026, 01:11 UTC

Severity

High

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

Patch: Available – fixed in 6.8.0-1042.44~22.04.1

Exploitation evidence

Disclosed: evidence found.
CVE published 19 Nov 2025
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 30 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), 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-7861-4

What to do

Upgrade the Ubuntu linux-aws-6.8 package to 6.8.0-1042.44~22.04.1.

Patches and advisories

ubuntu.com/security/notices/USN-7861-4 (opens in a new tab)

Affected software

Product	Affected	Fixed in
Ubuntu 22.04 LTSlinux-aws-6.8`pkg:deb/ubuntu/linux-aws-6.8?arch=source&distro=jammy`Other threats	Affected <6.8.0-1042.44~22.04.1	Fixed in 6.8.0-1042.44~22.04.1

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

AI-suggested

A security update is available in linux-aws-6.8.0-1042.44~22.04.1 that addresses these vulnerabilities. Users should apply this update promptly and reboot their systems to ensure all changes take effect. Due to an unavoidable ABI change, all third-party kernel modules must be recompiled and reinstalled after the update. Standard system upgrades will handle this automatically unless kernel metapackages have been manually removed.

Description

Multiple security vulnerabilities were discovered in the Linux kernel for AWS systems, including a flaw known as VMSCAPE that involves insufficient branch predictor isolation between a guest VM and a userspace hypervisor on certain processors. This flaw could allow an attacker in a guest VM to potentially expose sensitive information from the host OS. Additional issues affect the HSI, Bluetooth, and Timer subsystems. These vulnerabilities could be used by an attacker to compromise the system. A security update addressing these issues is available and requires a system reboot and recompilation of third-party kernel modules due to an ABI change.

Impact

An attacker with access to a guest VM on affected systems could exploit the VMSCAPE vulnerability to potentially expose sensitive information from the host operating system. Other vulnerabilities in the HSI, Bluetooth, and Timer subsystems could allow attackers to compromise the system. These issues collectively pose a risk of information disclosure and system compromise on affected Linux kernel AWS instances.

References

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