CVE-2026-64286KVM: arm64: Clear __hyp_running_vcpu when flushing the pKVM hyp vCPU
- 8.2HighCVSS base score
- 0.18%Exploitation in 30 daysEPSS · top 93% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
Description
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Clear __hyp_running_vcpu when flushing the pKVM hyp vCPU flush_hyp_vcpu() copies the host vCPU context into the hyp's private vCPU on every run. ctxt_to_vcpu() expects a guest context to have a NULL __hyp_running_vcpu, which is only ever set on the host context, so that it resolves the vCPU via container_of(). While this is generally the case, flush_hyp_vcpu() copies the context verbatim and does not enforce this, so a value provided by the host is dereferenced at EL2 (host -> EL2). Fix by clearing __hyp_running_vcpu after the copy.
Timeline
ID reserved
By Linux
- 6 days later
· 6 days later
Published
- 3 months later
· 3 months later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| LinuxCNA (assigner) | 3.1 | High8.2 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
| NVDNVD · Modified | 3.1 | High8.2 | CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H |
- EPSS (exploitation in 30 days)
- 0.18% · top 93% of all CVEs (12 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: total
The list uses the assigner's score when there is one, then CISA's, then NVD's: High 8.2.
Affected products
- affected be66e67f175096f283c9d5614c4991fc9e7ed975 – < 477145860dba4c30f0b4e36f02f4c5291c1c888b
- affected be66e67f175096f283c9d5614c4991fc9e7ed975 – < dfaef40d8a1533940fc1af788d70fce07362b4ce
- affected be66e67f175096f283c9d5614c4991fc9e7ed975 – < 6bea2f8becdb20d34378493c3b77a9b9cf8c6cfa
- affected be66e67f175096f283c9d5614c4991fc9e7ed975 – < d4f4d61715d1061ba83b88196a3605662be30750
- affected be66e67f175096f283c9d5614c4991fc9e7ed975 – < e8042f6e1d7befb2fb6b10a75918642bcd0acf9a
- affected 6.2
- unaffected < 6.2
- unaffected 6.6.145 – ≤ 6.6.*
- unaffected 6.12.97 – ≤ 6.12.*
- unaffected 6.18.39 – ≤ 6.18.*
- unaffected 7.1.4 – ≤ 7.1.*
- unaffected 7.2 – ≤ *
References
References5
- https://git.kernel.org/stable/c/477145860dba4c30f0b4e36f02f4c5291c1c888b (opens in a new tab)
- https://git.kernel.org/stable/c/dfaef40d8a1533940fc1af788d70fce07362b4ce (opens in a new tab)
- https://git.kernel.org/stable/c/6bea2f8becdb20d34378493c3b77a9b9cf8c6cfa (opens in a new tab)
- https://git.kernel.org/stable/c/d4f4d61715d1061ba83b88196a3605662be30750 (opens in a new tab)
- https://git.kernel.org/stable/c/e8042f6e1d7befb2fb6b10a75918642bcd0acf9a (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2026-48998 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2026-64286)Record last updated .