🛡️ CVE-2026-62427 on Alpine — xen

⚪ Unknown ✅ No Known Exploit OSV

N/A

CVSS Score

0 Low4 Medium7 High9 Critical10

Description

[This CNA information record relates to multiple CVEs; the

text explains which aspects/vulnerabilities correspond to which CVE.]

To manage the system, sysctl and platform operations are used by the

control domain or a possible Xenstore domain. Some of these operations

may not be executed in parallel, so a system-wide lock each is used.

The way those locks are acquired is, however, not providing any fairness.

Furthermore, with XSM/Flask in use, the lock acquire will, for some

operations, occur ahead of any permission checking.

The sysctl issue is CVE-2026-62426.

The platform-op issue is CVE-2026-62427.

Distribution advisory

This page covers CVE-2026-62427 as tracked by Alpine, for the package xen. The fix is available in version 4.21.2-r0; earlier versions remain affected.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Weakness class

ALPINE-CVE-2026-62427 is classified as CWE-284: Improper Access Control. The software does not restrict an action to the actors that should be allowed to perform it.

Affected software

ALPINE-CVE-2026-62427 is recorded against 1 package.

xen (fixed in 4.21.2-r0)

Timeline and source

Published on 28 July 2026 and last revised on 11 August 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

security.alpinelinux.org (Advisory)

Details

Severity Unknown

CVSS Score N/A

CVSS Vector CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE N/A

Public Exploit ✅ No

Source OSV

Published 2026-07-28

Updated 2026-08-12

Modified 2026-08-11

Fix URL N/A

Affected Packages

Software	From version	Fixed in
xen	—	4.21.2-r0

References

ADVISORY https://security.alpinelinux.org/vuln/CVE-2026-62427

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