CVE-2026-64286KVM: arm64: Clear __hyp_running_vcpu when flushing the pKVM hyp vCPU
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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.
- CVSS
- 8.2 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Analyzed
- Record last updated
- Oct 16, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from be66e67f175096f283c9d5614c4991fc9e7ed975 before 477145860dba4c30f0b4e36f02f4c5291c1c888b; from be66e67f175096f283c9d5614c4991fc9e7ed975 before dfaef40d8a1533940fc1af788d70fce07362b4ce; from be66e67f175096f283c9d5614c4991fc9e7ed975 before 6bea2f8becdb20d34378493c3b77a9b9cf8c6cfa; from be66e67f175096f283c9d5614c4991fc9e7ed975 before d4f4d61715d1061ba83b88196a3605662be30750; from be66e67f175096f283c9d5614c4991fc9e7ed975 before e8042f6e1d7befb2fb6b10a75918642bcd0acf9a | CNA record |
linux linux_kernel linux:linux_kernel | from 6.2 before 6.6.145; from 6.7 before 6.12.97; from 6.13 before 6.18.39; from 6.19 before 7.1.4 | NVD |
References
- https://git.kernel.org/stable/c/477145860dba4c30f0b4e36f02f4c5291c1c888bpatch
- https://git.kernel.org/stable/c/dfaef40d8a1533940fc1af788d70fce07362b4cepatch
- https://git.kernel.org/stable/c/6bea2f8becdb20d34378493c3b77a9b9cf8c6cfapatch
- https://git.kernel.org/stable/c/d4f4d61715d1061ba83b88196a3605662be30750patch
- https://git.kernel.org/stable/c/e8042f6e1d7befb2fb6b10a75918642bcd0acf9apatch
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.