8.8

CVE-2026-64562: linux Use After Free

CVSS: 8.8v3.1HighReceived
AliasesUBUNTU-CVE-2026-64562DEBIAN-CVE-2026-64562
Published 04-08-2026Last modified 19-10-2026
Open JSON

Vulnerability summary

CVE-2026-64562 is a high (CVSS 8.8) Use After Free vulnerability in linux. EPSS estimates a 0.13% chance of exploitation in the next 30 days, higher than 1.9% of scored vulnerabilities.

Overall risk
35/100
0100
Medium · default modelHow is this calculated?
CVSS score
8.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.13%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 35 · Related 33
MGASA-2026-0336MGASA-2026-0337OPENSUSE-SU-2026:11476-1OPENSUSE-SU-2026:21910-1SUSE-SU-2026:23477-1SUSE-SU-2026:23481-1

Timeline

  1. 04-08-2026
    PublishedVulnerability first disclosed.
  2. 19-10-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: KVM: nVMX: Hide shadow VMCS right after VMCLEAR free_nested() frees the shadow VMCS while vmcs01 still points to it. But because it is asynchronous with respect to loaded_vmcs_clear(), the vCPU might migrate before the pointer is cleared and __loaded_vmcs_clear() may then execute VMCLEAR. The VMCS needs to stay attached until its explicit VMCLEAR completes, but then it can be hidden and the page safely freed.

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.13%

Chance of exploitation in the next 30 days

Percentile

2%

Versus all other CVEs

30-day change

0.00 pp

From 0.13% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.13%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu169 products
  • linuxAll versions (No fix recorded) | < 5.15.0-198.208 | < 6.8.0-147.147 | < 7.0.0-38.38
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.15.0-1117.124 | < 6.8.0-1067.70 | < 7.0.0-1014.14
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian2 products
  • linux< 6.1.187-1 | < 6.12.101-1 | < 7.1.6-1
  • linux-6.12< 6.12.101-1~deb12u1
Linux1 product
  • linux≥ 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5, < b82c3144d8264265448292ca406f60bafeba3b6f | ≥ 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5, < 4f50e6aec16f69627dbad5704d1e90a255d766a7 | ≥ 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5, < dc3eecfa219ebc9d01eaf7d1abd1441efe884dab | ≥ 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5, < af56298e9d86e6098cd1d2e155cb2949b7c45412 | ≥ 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5, < 589419470030a89f16cf19300658b6dc644ca946 | ≥ 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5, < 8001d2ce9d9bd09118ce523aef595aa094573ae3 | ≥ 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5, < 1dabef6e206568bf9d9ade74f6e56a48ea35695d | ≥ 355f4fb1405ec29d0fac49b4d41fcd78cbd455d5, < 622ebfac01ba4f9c0060cebd41257fe46fc4a0b3 | 4.9

3 vendors · 172 products

References

28 links
Show all 28 references