VulnerabilityPublished 28 Oct 2025Updated 21 Oct 2026

CVE-2025-40065: Linux kernel · RISC-V: KVM: Write hgatp register with valid mode bits

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in d00b61cd37f4c183ce0edbc9f8ccf6d5430ea357 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 14:18 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.2% chance of exploitation in 30 days – higher than 14% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in d00b61cd37f4c183ce0edbc9f8ccf6d5430ea357, 8b6e327736db013b9e385c3f6f9f0b04ddf26e43, 5cba8ae00279296a586d0596443109d601b1d116 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 28 Oct 2025
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.

What to do

Upgrade Linux kernel to d00b61cd37f4c183ce0edbc9f8ccf6d5430ea357, 8b6e327736db013b9e385c3f6f9f0b04ddf26e43, 5cba8ae00279296a586d0596443109d601b1d116 or 2b351e3d04be9e1533f26c3464f1e44a5beace30.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ fd7bb4a251dfc1da3496bf59a4793937c13e8c1f, < d00b61cd37f4c183ce0edbc9f8ccf6d5430ea357	Fixed in d00b61cd37f4c183ce0edbc9f8ccf6d5430ea357
LinuxLinux	Affected ≥ fd7bb4a251dfc1da3496bf59a4793937c13e8c1f, < 8b6e327736db013b9e385c3f6f9f0b04ddf26e43	Fixed in 8b6e327736db013b9e385c3f6f9f0b04ddf26e43
LinuxLinux	Affected ≥ fd7bb4a251dfc1da3496bf59a4793937c13e8c1f, < 5cba8ae00279296a586d0596443109d601b1d116	Fixed in 5cba8ae00279296a586d0596443109d601b1d116
LinuxLinux	Affected ≥ fd7bb4a251dfc1da3496bf59a4793937c13e8c1f, < 2b351e3d04be9e1533f26c3464f1e44a5beace30	Fixed in 2b351e3d04be9e1533f26c3464f1e44a5beace30
LinuxLinux	Affected =5.16	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

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