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Vulnerabilities

Vulnerability · CVE-2026-64543

CVE-2026-64543 is listed by USN-8887-3: Linux kernel vulnerabilities.

Published Oct 9, 2026 · Canonical Ubuntu

Check if you run it

No confirmed exploitation is on record for CVE-2026-64543. EPSS is 0.13%. Act only if a listed version of Canonical Ubuntu is installed.

Gaps on this record

  • No version range is stored. A customer cannot check an installed version against this record.
  • No vendor fix or required action is stored. Compare the linked advisory before you change production.
Severity
Unknown—
Known exploitation
Not in CISA/VulnCheck KEV
EPSS
0.13%
Remediation
Vendor / distro source
Affected products
Canonical Ubuntu

CVE-2026-64543 is listed by USN-8887-3: Linux kernel vulnerabilities.

No affected version ranges are stored yet. Use the vendor advisory before you decide this record does not apply.

How to fix CVE-2026-64543

What to do

Three questions, each answered from this record only. Confirm the vendor advisory before you patch.

Should you patch?

No confirmed exploitation is on record for CVE-2026-64543. EPSS is 0.13%. Act only if a listed version of Canonical Ubuntu is installed.

Which versions are affected?

Affected version ranges are not on this record. Compare the installed version with the linked vendor advisory before you change production.

What should an analyst verify?

No weakness class is stored. EPSS 0.13%. There is no CISA KEV listing. No Exploit-DB or Metasploit reference is linked. Use the source links for the original advisory.

Technology hubs

Ubuntu security

Code

The project this record applies to. Exploit listings stay in References.

No public source repository is identified for this product.

Timeline

Detection, updates, and resolution for this record.

  1. Oct 9, 2026 · Ubuntu Security Notices

    Detected

    CVE-2026-64543 is listed by USN-8887-3: Linux kernel vulnerabilities.

Sources

  • CVE.orgVulnerability recordCVE-2026-64543

    Official CVE identifier

    cve.org
  • FIRST EPSSExploitation probabilityCVE-2026-64543

    30-day exploitation probability 0.1%

    first.org
  • Ubuntu Security NoticesVendor advisoryCVE-2026-64543

    It was discovered that some AMD processors did not properly perform Reverse Map Table (RMP) checks when the IOMMU accessed certain host buffers. A local attacker with hypervisor access could possibly use this to trigger an out-of-bounds condition and compromise the integrity of S

    ubuntu.com

Freshness

Last verified in this catalog Oct 18, 2026. Significant claims (KEV, EPSS, CVSS, affected ranges) come from the source rows above — open the original publisher for the authoritative advisory.