CVE-2025-40065: Linux kernel · RISC-V: KVM: Write hgatp register with valid mode bits
Source GCVE Database
Not known to be exploited · fixed in feb64ca53d97b3ac8ba9ecbeae5f9426f1513650 : update Linux kernel when convenient.
Data as of 30 Oct 2026, 16:33 UTC
Rated by Threat Radar · No CVSS score from NVD or the CNA
Thin evidence
One scorer or none- Patch
- Available – fixed in feb64ca53d97b3ac8ba9ecbeae5f9426f1513650, d00b61cd37f4c183ce0edbc9f8ccf6d5430ea357, 8b6e327736db013b9e385c3f6f9f0b04ddf26e43 +2
Exploitation evidence
Disclosed: evidence found.
CVE published 28 Oct 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.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in– |
Description
In the Linux kernel, the following vulnerability has been resolved: RISC-V: KVM: Write hgatp register with valid mode bits According to the RISC-V Privileged Architecture Spec, when MODE=Bare is selected,software must write zero to the remaining fields of hgatp. We have detected the valid mode supported by the HW before, So using a valid mode to detect how many vmid bits are supported.
References
- nvd.nist.gov/vuln/detail/CVE-2025-40065 (opens in a new tab)
- git.kernel.org/stable/c/2b351e3d04be9e1533f26c3464f1e44a5beace30 (opens in a new tab)
- git.kernel.org/stable/c/5cba8ae00279296a586d0596443109d601b1d116 (opens in a new tab)
- git.kernel.org/stable/c/8b6e327736db013b9e385c3f6f9f0b04ddf26e43 (opens in a new tab)
- git.kernel.org/stable/c/d00b61cd37f4c183ce0edbc9f8ccf6d5430ea357 (opens in a new tab)
- git.kernel.org/stable/c/feb64ca53d97b3ac8ba9ecbeae5f9426f1513650 (opens in a new tab)