VulnerabilityPublished 27 May 2026Updated 21 Oct 2026

CVE-2026-46071: Linux kernel · KVM: nSVM: Avoid clearing VMCB_LBR in vmcb12

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in b53ab5167a81537777ac780bbd93d32613aa3bda : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Unrated

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

EPSS: 0.1% chance of exploitation in 30 days – higher than 1% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in b53ab5167a81537777ac780bbd93d32613aa3bda, a3f0981a5a0e0bd51ad74cc7d9eed32294b24002, 165b08d2d1346dce5ed43db65e10f3194b9ae2fe +2

Exploitation evidence

Disclosed: evidence found.
CVE published 27 May 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.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ d20c796ca3709801f8a7fa36e8770a3dd8ebd34e, < b53ab5167a81537777ac780bbd93d32613aa3bda	Fixed in b53ab5167a81537777ac780bbd93d32613aa3bda
LinuxLinux	Affected ≥ d20c796ca3709801f8a7fa36e8770a3dd8ebd34e, < a3f0981a5a0e0bd51ad74cc7d9eed32294b24002	Fixed in a3f0981a5a0e0bd51ad74cc7d9eed32294b24002
LinuxLinux	Affected ≥ d20c796ca3709801f8a7fa36e8770a3dd8ebd34e, < 165b08d2d1346dce5ed43db65e10f3194b9ae2fe	Fixed in 165b08d2d1346dce5ed43db65e10f3194b9ae2fe
LinuxLinux	Affected ≥ d20c796ca3709801f8a7fa36e8770a3dd8ebd34e, < 11d347b7edf5093d69aca72317300798a32bfd6b	Fixed in 11d347b7edf5093d69aca72317300798a32bfd6b
LinuxLinux	Affected ≥ d20c796ca3709801f8a7fa36e8770a3dd8ebd34e, < 9efe23568806d1cd06f7d146f9b3037b8d585a9f	Fixed in 9efe23568806d1cd06f7d146f9b3037b8d585a9f
LinuxLinux	Affected =5.19	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: nSVM: Avoid clearing VMCB_LBR in vmcb12 svm_copy_lbrs() always marks VMCB_LBR dirty in the destination VMCB. However, nested_svm_vmexit() uses it to copy LBRs to vmcb12, and clearing clean bits in vmcb12 is not architecturally defined. Move vmcb_mark_dirty() to callers and drop it for vmcb12. This also facilitates incoming refactoring that does not pass the entire VMCB to svm_copy_lbrs().

References

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