VulnerabilityPublished 3 Dec 2025Updated 30 Oct 2026

CVE-2025-37838: linux-raspi, linux-raspi-realtime, linux-xilinx vulnerabilities

Affects Linux kernelSource GCVE Database

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Mentioned vulnerabilities

Not known to be exploited · fixed in 6.8.0-1042.46 : patch Linux kernel soon.

Data as of 31 Oct 2026, 01:10 UTC

Severity

High

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

Patch: Available – fixed in 6.8.0-1042.46, 6.8.0-1019.20, 6.8.0-2033.34

Exploitation evidence

Disclosed: evidence found.
CVE published 3 Dec 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-7861-5

What to do

Upgrade the Ubuntu to 6.8.0-1042.46 (linux-raspi package) or 6.8.0-1019.20 (linux-xilinx package) or 6.8.0-2033.34 (linux-raspi-realtime package).

Patches and advisories

ubuntu.com/security/notices/USN-7861-5 (opens in a new tab)

Affected software

Product	Affected	Fixed in
Ubuntu 24.04 LTSlinux-raspi`pkg:deb/ubuntu/linux-raspi?arch=source&distro=noble`Other threats	Affected <6.8.0-1042.46	Fixed in 6.8.0-1042.46
Ubuntu 24.04 LTSlinux-xilinx`pkg:deb/ubuntu/linux-xilinx?arch=source&distro=noble`Other threats	Affected <6.8.0-1019.20	Fixed in 6.8.0-1019.20
Ubuntu Pro Realtime 24.04 LTSlinux-raspi-realtime`pkg:deb/ubuntu/linux-raspi-realtime?arch=source&distro=realtime/noble`Other threats	Affected <6.8.0-2033.34	Fixed in 6.8.0-2033.34

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 should be applied by updating to the fixed kernel versions 6.8.0-1042.46, 6.8.0-1019.20, or 6.8.0-2033.34 as appropriate for the platform. After updating, a system reboot is required to activate the fixes. Due to an ABI change, all third-party kernel modules must be recompiled and reinstalled. Users should follow the official Ubuntu security notice USN-7861-5 for detailed update instructions.

Description

Multiple security vulnerabilities were discovered in the Linux kernel for Raspberry Pi, Raspberry Pi Real-time, and Xilinx systems. These include a branch predictor isolation flaw known as VMSCAPE (CVE-2025-40300) that could allow an attacker in a guest VM to expose sensitive information from the host OS. Additional flaws affect the HSI, Bluetooth, and Timer subsystems. Updates correcting these issues have been released and require a system reboot and recompilation of third-party kernel modules due to ABI changes.

Impact

An attacker with access to a guest virtual machine could exploit the VMSCAPE vulnerability to expose sensitive information from the host OS, potentially breaching confidentiality. Other kernel subsystem flaws could allow attackers to compromise system integrity or availability. The vulnerabilities collectively pose a risk of system compromise if left unpatched.

Summary

Researchers Jean-Claude Graf, Sandro Rüegge, Ali Hajiabadi, and Kaveh Razavi identified insufficient branch predictor isolation between a guest VM and a userspace hypervisor on certain processors in the Linux kernel, termed VMSCAPE (CVE-2025-40300). This vulnerability could allow an attacker within a guest VM to potentially leak sensitive information from the host operating system. Alongside this, several other security issues were found in the Linux kernel affecting the HSI, Bluetooth, and Timer subsystems (CVE-2025-37838, CVE-2025-38118, CVE-2025-38352). These vulnerabilities collectively could be exploited to compromise system security. The issues affect linux-raspi, linux-raspi-realtime, and linux-xilinx kernel packages. Fixed versions have been released, including 6.8.0-1042.46, 6.8.0-1019.20, and 6.8.0-2033.34.

References

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