CVE-2026-64286
KVM: arm64: Clear __hyp_running_vcpu when flushing the pKVM hyp vCPU
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.
INFO
Published Date :
July 25, 2026, 10:17 a.m.
Last Modified :
Aug. 17, 2026, 5:17 a.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Update the Linux kernel to a version with the fix.
- Apply the KVM specific patch.
- Clear __hyp_running_vcpu after context copy.
- Ensure host context has NULL __hyp_running_vcpu.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-64286.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-64286 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-64286
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-64286 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-64286 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Aug. 17, 2026
Action Type Old Value New Value Changed Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'be66e67f175096f283c9d5614c4991fc9e7ed975', 'lessThan': '477145860dba4c30f0b4e36f02f4c5291c1c888b', 'versionType': 'git'}, {'status': 'affected', 'version': 'be66e67f175096f283c9d5614c4991fc9e7ed975', 'lessThan': 'dfaef40d8a1533940fc1af788d70fce07362b4ce', 'versionType': 'git'}, {'status': 'affected', 'version': 'be66e67f175096f283c9d5614c4991fc9e7ed975', 'lessThan': '6bea2f8becdb20d34378493c3b77a9b9cf8c6cfa', 'versionType': 'git'}, {'status': 'affected', 'version': 'be66e67f175096f283c9d5614c4991fc9e7ed975', 'lessThan': 'd4f4d61715d1061ba83b88196a3605662be30750', 'versionType': 'git'}, {'status': 'affected', 'version': 'be66e67f175096f283c9d5614c4991fc9e7ed975', 'lessThan': 'e8042f6e1d7befb2fb6b10a75918642bcd0acf9a', 'versionType': 'git'}], 'programFiles': ['arch/arm64/kvm/hyp/nvhe/hyp-main.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.2'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.2', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['arch/arm64/kvm/hyp/nvhe/hyp-main.c'], 'defaultStatus': 'affected'}] [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'be66e67f175096f283c9d5614c4991fc9e7ed975', 'lessThan': '477145860dba4c30f0b4e36f02f4c5291c1c888b', 'versionType': 'git'}, {'status': 'affected', 'version': 'be66e67f175096f283c9d5614c4991fc9e7ed975', 'lessThan': 'dfaef40d8a1533940fc1af788d70fce07362b4ce', 'versionType': 'git'}, {'status': 'affected', 'version': 'be66e67f175096f283c9d5614c4991fc9e7ed975', 'lessThan': '6bea2f8becdb20d34378493c3b77a9b9cf8c6cfa', 'versionType': 'git'}, {'status': 'affected', 'version': 'be66e67f175096f283c9d5614c4991fc9e7ed975', 'lessThan': 'd4f4d61715d1061ba83b88196a3605662be30750', 'versionType': 'git'}, {'status': 'affected', 'version': 'be66e67f175096f283c9d5614c4991fc9e7ed975', 'lessThan': 'e8042f6e1d7befb2fb6b10a75918642bcd0acf9a', 'versionType': 'git'}], 'programFiles': ['arch/arm64/kvm/hyp/nvhe/hyp-main.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.2'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.2', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['arch/arm64/kvm/hyp/nvhe/hyp-main.c'], 'defaultStatus': 'affected'}] -
Initial Analysis by [email protected]
Aug. 13, 2026
Action Type Old Value New Value Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.145 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.39 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.1.4 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.97 Added Reference Type kernel.org: https://git.kernel.org/stable/c/477145860dba4c30f0b4e36f02f4c5291c1c888b Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/6bea2f8becdb20d34378493c3b77a9b9cf8c6cfa Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d4f4d61715d1061ba83b88196a3605662be30750 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/dfaef40d8a1533940fc1af788d70fce07362b4ce Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/e8042f6e1d7befb2fb6b10a75918642bcd0acf9a Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 27, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:H/UI:N/S:C/C:H/I:H/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jul. 25, 2026
Action Type Old Value New Value Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': 'be66e67f175096f283c9d5614c4991fc9e7ed975', 'lessThan': '477145860dba4c30f0b4e36f02f4c5291c1c888b', 'versionType': 'git'}, {'status': 'affected', 'version': 'be66e67f175096f283c9d5614c4991fc9e7ed975', 'lessThan': 'dfaef40d8a1533940fc1af788d70fce07362b4ce', 'versionType': 'git'}, {'status': 'affected', 'version': 'be66e67f175096f283c9d5614c4991fc9e7ed975', 'lessThan': '6bea2f8becdb20d34378493c3b77a9b9cf8c6cfa', 'versionType': 'git'}, {'status': 'affected', 'version': 'be66e67f175096f283c9d5614c4991fc9e7ed975', 'lessThan': 'd4f4d61715d1061ba83b88196a3605662be30750', 'versionType': 'git'}, {'status': 'affected', 'version': 'be66e67f175096f283c9d5614c4991fc9e7ed975', 'lessThan': 'e8042f6e1d7befb2fb6b10a75918642bcd0acf9a', 'versionType': 'git'}], 'programFiles': ['arch/arm64/kvm/hyp/nvhe/hyp-main.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '6.2'}, {'status': 'unaffected', 'version': '0', 'lessThan': '6.2', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '6.6.145', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.97', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.39', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.1.4', 'versionType': 'semver', 'lessThanOrEqual': '7.1.*'}, {'status': 'unaffected', 'version': '7.2-rc1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['arch/arm64/kvm/hyp/nvhe/hyp-main.c'], 'defaultStatus': 'affected'}] Added 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. Added Reference https://git.kernel.org/stable/c/477145860dba4c30f0b4e36f02f4c5291c1c888b Added Reference https://git.kernel.org/stable/c/6bea2f8becdb20d34378493c3b77a9b9cf8c6cfa Added Reference https://git.kernel.org/stable/c/d4f4d61715d1061ba83b88196a3605662be30750 Added Reference https://git.kernel.org/stable/c/dfaef40d8a1533940fc1af788d70fce07362b4ce Added Reference https://git.kernel.org/stable/c/e8042f6e1d7befb2fb6b10a75918642bcd0acf9a