ALPINE-CVE-2026-23553

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Please try reporting it to the source first.
Source
https://security.alpinelinux.org/vuln/CVE-2026-23553
Import Source
https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2026-23553.json
JSON Data
https://api.test.osv.dev/v1/vulns/ALPINE-CVE-2026-23553
Upstream
  • CVE-2026-23553
Published
2026-01-28T16:16:16.853Z
Modified
2026-01-29T11:18:29.057696Z
Severity
  • 2.9 (Low) CVSS_V3 - CVSS:3.1/AV:L/AC:H/PR:N/UI:N/S:U/C:L/I:N/A:N CVSS Calculator
Summary
[none]
Details

In the context switch logic Xen attempts to skip an IBPB in the case of a vCPU returning to a CPU on which it was the previous vCPU to run. While safe for Xen's isolation between vCPUs, this prevents the guest kernel correctly isolating between tasks. Consider:

1) vCPU runs on CPU A, running task 1. 2) vCPU moves to CPU B, idle gets scheduled on A. Xen skips IBPB. 3) On CPU B, guest kernel switches from task 1 to 2, issuing IBPB. 4) vCPU moves back to CPU A. Xen skips IBPB again.

Now, task 2 is running on CPU A with task 1's training still in the BTB.

References

Affected packages

Alpine:v3.20 / xen

Package

Name
xen
Purl
pkg:apk/alpine/xen?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.18.5-r4

Affected versions

4.*
4.0.1-r0
4.0.1-r1
4.0.1-r2
4.0.1-r3
4.1.0-r0
4.1.0-r1
4.1.0-r2
4.1.1-r0
4.1.1-r1
4.1.1-r2
4.1.2-r3
4.1.2-r4
4.1.2-r5
4.1.2-r6
4.1.2-r7
4.1.2-r8
4.1.2-r9
4.1.2-r10
4.1.2-r11
4.1.2-r12
4.1.3-r0
4.2.0-r0
4.2.0-r1
4.2.0-r2
4.2.0-r3
4.2.0-r4
4.2.0-r5
4.2.0-r6
4.2.0-r7
4.2.1-r0
4.2.1-r1
4.2.1-r2
4.2.1-r3
4.2.1-r4
4.2.1-r5
4.2.1-r6
4.2.1-r7
4.2.1-r8
4.2.1-r9
4.2.1-r10
4.2.1-r11
4.2.2-r0
4.2.2-r2
4.2.2-r3
4.2.2-r4
4.2.2-r5
4.2.2-r6
4.2.2-r7
4.2.2-r8
4.2.2-r9
4.2.2-r10
4.2.2-r11
4.3.0-r0
4.3.0-r1
4.3.0-r2
4.3.0-r3
4.3.0-r4
4.3.0-r5
4.3.0-r6
4.3.0-r7
4.3.0-r8
4.3.1-r0
4.3.1-r1
4.3.1-r2
4.3.1-r3
4.3.2-r0
4.3.2-r1
4.3.2-r2
4.3.2-r3
4.3.2-r4
4.3.3-r0
4.4.1-r0
4.4.1-r1
4.4.1-r2
4.4.1-r3
4.4.1-r4
4.4.1-r5
4.4.1-r6
4.4.1-r7
4.4.1-r8
4.4.2-r0
4.4.2-r1
4.5.0-r0
4.5.0-r1
4.5.1-r0
4.5.1-r1
4.5.1-r2
4.5.1-r3
4.6.0-r0
4.6.0-r1
4.6.0-r2
4.6.0-r3
4.6.0-r4
4.6.0-r5
4.6.1-r0
4.6.1-r1
4.6.1-r2
4.6.3-r0
4.6.3-r1
4.7.0-r0
4.7.0-r1
4.7.0-r2
4.7.0-r3
4.7.0-r4
4.7.0-r5
4.7.1-r0
4.7.1-r1
4.7.1-r2
4.7.1-r3
4.7.1-r4
4.7.1-r5
4.7.2-r0
4.8.1-r0
4.8.1-r1
4.8.1-r2
4.8.1-r3
4.8.1-r4
4.9.0-r0
4.9.0-r1
4.9.0-r2
4.9.0-r3
4.9.0-r4
4.9.0-r5
4.9.0-r6
4.9.0-r7
4.9.0-r8
4.9.1-r0
4.9.1-r1
4.9.1-r2
4.9.1-r3
4.10.0-r0
4.10.0-r1
4.10.0-r2
4.10.0-r3
4.10.1-r0
4.10.1-r1
4.10.1-r2
4.11.0-r0
4.11.0-r1
4.11.1-r0
4.11.1-r1
4.12.0-r0
4.12.0-r1
4.12.0-r2
4.12.0-r3
4.12.1-r0
4.12.1-r1
4.12.1-r2
4.13.0-r0
4.13.0-r1
4.13.0-r2
4.13.0-r3
4.13.0-r4
4.13.1-r0
4.13.1-r1
4.13.1-r2
4.13.1-r3
4.13.1-r4
4.13.1-r5
4.14.0-r0
4.14.0-r1
4.14.0-r2
4.14.0-r3
4.14.1-r0
4.14.1-r1
4.14.1-r2
4.14.1-r3
4.14.1-r4
4.14.1-r5
4.15.0-r0
4.15.0-r1
4.15.0-r2
4.15.0-r3
4.15.0-r4
4.15.0-r5
4.15.1-r0
4.15.1-r1
4.15.1-r2
4.15.1-r3
4.16.0-r0
4.16.0-r1
4.16.1-r0
4.16.1-r1
4.16.1-r2
4.16.1-r3
4.16.1-r4
4.16.1-r5
4.16.1-r6
4.16.1-r7
4.16.2-r0
4.16.2-r1
4.16.2-r2
4.16.2-r3
4.17.0-r0
4.17.0-r1
4.17.0-r2
4.17.0-r3
4.17.0-r4
4.17.0-r5
4.17.1-r0
4.17.1-r1
4.17.1-r2
4.17.1-r3
4.17.1-r4
4.17.1-r5
4.17.2-r0
4.17.2-r1
4.17.2-r2
4.17.2-r3
4.17.2-r4
4.18.0-r0
4.18.0-r1
4.18.0-r2
4.18.0-r3
4.18.0-r4
4.18.0-r5
4.18.2-r0
4.18.2-r1
4.18.3-r0
4.18.3-r1
4.18.3-r2
4.18.4-r0
4.18.4-r1
4.18.5-r0
4.18.5-r1
4.18.5-r2
4.18.5-r3

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2026-23553.json"

Alpine:v3.21 / xen

Package

Name
xen
Purl
pkg:apk/alpine/xen?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.19.4-r1

Affected versions

4.*
4.0.1-r0
4.0.1-r1
4.0.1-r2
4.0.1-r3
4.1.0-r0
4.1.0-r1
4.1.0-r2
4.1.1-r0
4.1.1-r1
4.1.1-r2
4.1.2-r3
4.1.2-r4
4.1.2-r5
4.1.2-r6
4.1.2-r7
4.1.2-r8
4.1.2-r9
4.1.2-r10
4.1.2-r11
4.1.2-r12
4.1.3-r0
4.2.0-r0
4.2.0-r1
4.2.0-r2
4.2.0-r3
4.2.0-r4
4.2.0-r5
4.2.0-r6
4.2.0-r7
4.2.1-r0
4.2.1-r1
4.2.1-r2
4.2.1-r3
4.2.1-r4
4.2.1-r5
4.2.1-r6
4.2.1-r7
4.2.1-r8
4.2.1-r9
4.2.1-r10
4.2.1-r11
4.2.2-r0
4.2.2-r2
4.2.2-r3
4.2.2-r4
4.2.2-r5
4.2.2-r6
4.2.2-r7
4.2.2-r8
4.2.2-r9
4.2.2-r10
4.2.2-r11
4.3.0-r0
4.3.0-r1
4.3.0-r2
4.3.0-r3
4.3.0-r4
4.3.0-r5
4.3.0-r6
4.3.0-r7
4.3.0-r8
4.3.1-r0
4.3.1-r1
4.3.1-r2
4.3.1-r3
4.3.2-r0
4.3.2-r1
4.3.2-r2
4.3.2-r3
4.3.2-r4
4.3.3-r0
4.4.1-r0
4.4.1-r1
4.4.1-r2
4.4.1-r3
4.4.1-r4
4.4.1-r5
4.4.1-r6
4.4.1-r7
4.4.1-r8
4.4.2-r0
4.4.2-r1
4.5.0-r0
4.5.0-r1
4.5.1-r0
4.5.1-r1
4.5.1-r2
4.5.1-r3
4.6.0-r0
4.6.0-r1
4.6.0-r2
4.6.0-r3
4.6.0-r4
4.6.0-r5
4.6.1-r0
4.6.1-r1
4.6.1-r2
4.6.3-r0
4.6.3-r1
4.7.0-r0
4.7.0-r1
4.7.0-r2
4.7.0-r3
4.7.0-r4
4.7.0-r5
4.7.1-r0
4.7.1-r1
4.7.1-r2
4.7.1-r3
4.7.1-r4
4.7.1-r5
4.7.2-r0
4.8.1-r0
4.8.1-r1
4.8.1-r2
4.8.1-r3
4.8.1-r4
4.9.0-r0
4.9.0-r1
4.9.0-r2
4.9.0-r3
4.9.0-r4
4.9.0-r5
4.9.0-r6
4.9.0-r7
4.9.0-r8
4.9.1-r0
4.9.1-r1
4.9.1-r2
4.9.1-r3
4.10.0-r0
4.10.0-r1
4.10.0-r2
4.10.0-r3
4.10.1-r0
4.10.1-r1
4.10.1-r2
4.11.0-r0
4.11.0-r1
4.11.1-r0
4.11.1-r1
4.12.0-r0
4.12.0-r1
4.12.0-r2
4.12.0-r3
4.12.1-r0
4.12.1-r1
4.12.1-r2
4.13.0-r0
4.13.0-r1
4.13.0-r2
4.13.0-r3
4.13.0-r4
4.13.1-r0
4.13.1-r1
4.13.1-r2
4.13.1-r3
4.13.1-r4
4.13.1-r5
4.14.0-r0
4.14.0-r1
4.14.0-r2
4.14.0-r3
4.14.1-r0
4.14.1-r1
4.14.1-r2
4.14.1-r3
4.14.1-r4
4.14.1-r5
4.15.0-r0
4.15.0-r1
4.15.0-r2
4.15.0-r3
4.15.0-r4
4.15.0-r5
4.15.1-r0
4.15.1-r1
4.15.1-r2
4.15.1-r3
4.16.0-r0
4.16.0-r1
4.16.1-r0
4.16.1-r1
4.16.1-r2
4.16.1-r3
4.16.1-r4
4.16.1-r5
4.16.1-r6
4.16.1-r7
4.16.2-r0
4.16.2-r1
4.16.2-r2
4.16.2-r3
4.17.0-r0
4.17.0-r1
4.17.0-r2
4.17.0-r3
4.17.0-r4
4.17.0-r5
4.17.1-r0
4.17.1-r1
4.17.1-r2
4.17.1-r3
4.17.1-r4
4.17.1-r5
4.17.2-r0
4.17.2-r1
4.17.2-r2
4.17.2-r3
4.17.2-r4
4.18.0-r0
4.18.0-r1
4.18.0-r2
4.18.0-r3
4.18.0-r4
4.18.0-r5
4.18.2-r0
4.18.2-r1
4.18.2-r2
4.19.0-r0
4.19.0-r1
4.19.1-r0
4.19.2-r0
4.19.2-r1
4.19.2-r2
4.19.3-r0
4.19.3-r1
4.19.3-r2
4.19.4-r0

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2026-23553.json"

Alpine:v3.22 / xen

Package

Name
xen
Purl
pkg:apk/alpine/xen?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.20.2-r1

Affected versions

4.*
4.0.1-r0
4.0.1-r1
4.0.1-r2
4.0.1-r3
4.1.0-r0
4.1.0-r1
4.1.0-r2
4.1.1-r0
4.1.1-r1
4.1.1-r2
4.1.2-r3
4.1.2-r4
4.1.2-r5
4.1.2-r6
4.1.2-r7
4.1.2-r8
4.1.2-r9
4.1.2-r10
4.1.2-r11
4.1.2-r12
4.1.3-r0
4.2.0-r0
4.2.0-r1
4.2.0-r2
4.2.0-r3
4.2.0-r4
4.2.0-r5
4.2.0-r6
4.2.0-r7
4.2.1-r0
4.2.1-r1
4.2.1-r2
4.2.1-r3
4.2.1-r4
4.2.1-r5
4.2.1-r6
4.2.1-r7
4.2.1-r8
4.2.1-r9
4.2.1-r10
4.2.1-r11
4.2.2-r0
4.2.2-r2
4.2.2-r3
4.2.2-r4
4.2.2-r5
4.2.2-r6
4.2.2-r7
4.2.2-r8
4.2.2-r9
4.2.2-r10
4.2.2-r11
4.3.0-r0
4.3.0-r1
4.3.0-r2
4.3.0-r3
4.3.0-r4
4.3.0-r5
4.3.0-r6
4.3.0-r7
4.3.0-r8
4.3.1-r0
4.3.1-r1
4.3.1-r2
4.3.1-r3
4.3.2-r0
4.3.2-r1
4.3.2-r2
4.3.2-r3
4.3.2-r4
4.3.3-r0
4.4.1-r0
4.4.1-r1
4.4.1-r2
4.4.1-r3
4.4.1-r4
4.4.1-r5
4.4.1-r6
4.4.1-r7
4.4.1-r8
4.4.2-r0
4.4.2-r1
4.5.0-r0
4.5.0-r1
4.5.1-r0
4.5.1-r1
4.5.1-r2
4.5.1-r3
4.6.0-r0
4.6.0-r1
4.6.0-r2
4.6.0-r3
4.6.0-r4
4.6.0-r5
4.6.1-r0
4.6.1-r1
4.6.1-r2
4.6.3-r0
4.6.3-r1
4.7.0-r0
4.7.0-r1
4.7.0-r2
4.7.0-r3
4.7.0-r4
4.7.0-r5
4.7.1-r0
4.7.1-r1
4.7.1-r2
4.7.1-r3
4.7.1-r4
4.7.1-r5
4.7.2-r0
4.8.1-r0
4.8.1-r1
4.8.1-r2
4.8.1-r3
4.8.1-r4
4.9.0-r0
4.9.0-r1
4.9.0-r2
4.9.0-r3
4.9.0-r4
4.9.0-r5
4.9.0-r6
4.9.0-r7
4.9.0-r8
4.9.1-r0
4.9.1-r1
4.9.1-r2
4.9.1-r3
4.10.0-r0
4.10.0-r1
4.10.0-r2
4.10.0-r3
4.10.1-r0
4.10.1-r1
4.10.1-r2
4.11.0-r0
4.11.0-r1
4.11.1-r0
4.11.1-r1
4.12.0-r0
4.12.0-r1
4.12.0-r2
4.12.0-r3
4.12.1-r0
4.12.1-r1
4.12.1-r2
4.13.0-r0
4.13.0-r1
4.13.0-r2
4.13.0-r3
4.13.0-r4
4.13.1-r0
4.13.1-r1
4.13.1-r2
4.13.1-r3
4.13.1-r4
4.13.1-r5
4.14.0-r0
4.14.0-r1
4.14.0-r2
4.14.0-r3
4.14.1-r0
4.14.1-r1
4.14.1-r2
4.14.1-r3
4.14.1-r4
4.14.1-r5
4.15.0-r0
4.15.0-r1
4.15.0-r2
4.15.0-r3
4.15.0-r4
4.15.0-r5
4.15.1-r0
4.15.1-r1
4.15.1-r2
4.15.1-r3
4.16.0-r0
4.16.0-r1
4.16.1-r0
4.16.1-r1
4.16.1-r2
4.16.1-r3
4.16.1-r4
4.16.1-r5
4.16.1-r6
4.16.1-r7
4.16.2-r0
4.16.2-r1
4.16.2-r2
4.16.2-r3
4.17.0-r0
4.17.0-r1
4.17.0-r2
4.17.0-r3
4.17.0-r4
4.17.0-r5
4.17.1-r0
4.17.1-r1
4.17.1-r2
4.17.1-r3
4.17.1-r4
4.17.1-r5
4.17.2-r0
4.17.2-r1
4.17.2-r2
4.17.2-r3
4.17.2-r4
4.18.0-r0
4.18.0-r1
4.18.0-r2
4.18.0-r3
4.18.0-r4
4.18.0-r5
4.18.2-r0
4.18.2-r1
4.18.2-r2
4.19.0-r0
4.19.0-r1
4.19.1-r0
4.19.1-r1
4.19.2-r0
4.20.0-r0
4.20.0-r1
4.20.1-r0
4.20.1-r1
4.20.1-r2
4.20.2-r0

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2026-23553.json"

Alpine:v3.23 / xen

Package

Name
xen
Purl
pkg:apk/alpine/xen?arch=source

Affected ranges

Type
ECOSYSTEM
Events
Introduced
0Unknown introduced version / All previous versions are affected
Fixed
4.20.2-r1

Affected versions

4.*
4.0.1-r0
4.0.1-r1
4.0.1-r2
4.0.1-r3
4.1.0-r0
4.1.0-r1
4.1.0-r2
4.1.1-r0
4.1.1-r1
4.1.1-r2
4.1.2-r3
4.1.2-r4
4.1.2-r5
4.1.2-r6
4.1.2-r7
4.1.2-r8
4.1.2-r9
4.1.2-r10
4.1.2-r11
4.1.2-r12
4.1.3-r0
4.2.0-r0
4.2.0-r1
4.2.0-r2
4.2.0-r3
4.2.0-r4
4.2.0-r5
4.2.0-r6
4.2.0-r7
4.2.1-r0
4.2.1-r1
4.2.1-r2
4.2.1-r3
4.2.1-r4
4.2.1-r5
4.2.1-r6
4.2.1-r7
4.2.1-r8
4.2.1-r9
4.2.1-r10
4.2.1-r11
4.2.2-r0
4.2.2-r2
4.2.2-r3
4.2.2-r4
4.2.2-r5
4.2.2-r6
4.2.2-r7
4.2.2-r8
4.2.2-r9
4.2.2-r10
4.2.2-r11
4.3.0-r0
4.3.0-r1
4.3.0-r2
4.3.0-r3
4.3.0-r4
4.3.0-r5
4.3.0-r6
4.3.0-r7
4.3.0-r8
4.3.1-r0
4.3.1-r1
4.3.1-r2
4.3.1-r3
4.3.2-r0
4.3.2-r1
4.3.2-r2
4.3.2-r3
4.3.2-r4
4.3.3-r0
4.4.1-r0
4.4.1-r1
4.4.1-r2
4.4.1-r3
4.4.1-r4
4.4.1-r5
4.4.1-r6
4.4.1-r7
4.4.1-r8
4.4.2-r0
4.4.2-r1
4.5.0-r0
4.5.0-r1
4.5.1-r0
4.5.1-r1
4.5.1-r2
4.5.1-r3
4.6.0-r0
4.6.0-r1
4.6.0-r2
4.6.0-r3
4.6.0-r4
4.6.0-r5
4.6.1-r0
4.6.1-r1
4.6.1-r2
4.6.3-r0
4.6.3-r1
4.7.0-r0
4.7.0-r1
4.7.0-r2
4.7.0-r3
4.7.0-r4
4.7.0-r5
4.7.1-r0
4.7.1-r1
4.7.1-r2
4.7.1-r3
4.7.1-r4
4.7.1-r5
4.7.2-r0
4.8.1-r0
4.8.1-r1
4.8.1-r2
4.8.1-r3
4.8.1-r4
4.9.0-r0
4.9.0-r1
4.9.0-r2
4.9.0-r3
4.9.0-r4
4.9.0-r5
4.9.0-r6
4.9.0-r7
4.9.0-r8
4.9.1-r0
4.9.1-r1
4.9.1-r2
4.9.1-r3
4.10.0-r0
4.10.0-r1
4.10.0-r2
4.10.0-r3
4.10.1-r0
4.10.1-r1
4.10.1-r2
4.11.0-r0
4.11.0-r1
4.11.1-r0
4.11.1-r1
4.12.0-r0
4.12.0-r1
4.12.0-r2
4.12.0-r3
4.12.1-r0
4.12.1-r1
4.12.1-r2
4.13.0-r0
4.13.0-r1
4.13.0-r2
4.13.0-r3
4.13.0-r4
4.13.1-r0
4.13.1-r1
4.13.1-r2
4.13.1-r3
4.13.1-r4
4.13.1-r5
4.14.0-r0
4.14.0-r1
4.14.0-r2
4.14.0-r3
4.14.1-r0
4.14.1-r1
4.14.1-r2
4.14.1-r3
4.14.1-r4
4.14.1-r5
4.15.0-r0
4.15.0-r1
4.15.0-r2
4.15.0-r3
4.15.0-r4
4.15.0-r5
4.15.1-r0
4.15.1-r1
4.15.1-r2
4.15.1-r3
4.16.0-r0
4.16.0-r1
4.16.1-r0
4.16.1-r1
4.16.1-r2
4.16.1-r3
4.16.1-r4
4.16.1-r5
4.16.1-r6
4.16.1-r7
4.16.2-r0
4.16.2-r1
4.16.2-r2
4.16.2-r3
4.17.0-r0
4.17.0-r1
4.17.0-r2
4.17.0-r3
4.17.0-r4
4.17.0-r5
4.17.1-r0
4.17.1-r1
4.17.1-r2
4.17.1-r3
4.17.1-r4
4.17.1-r5
4.17.2-r0
4.17.2-r1
4.17.2-r2
4.17.2-r3
4.17.2-r4
4.18.0-r0
4.18.0-r1
4.18.0-r2
4.18.0-r3
4.18.0-r4
4.18.0-r5
4.18.2-r0
4.18.2-r1
4.18.2-r2
4.19.0-r0
4.19.0-r1
4.19.1-r0
4.19.1-r1
4.19.2-r0
4.20.0-r0
4.20.0-r1
4.20.0-r2
4.20.1-r0
4.20.1-r1
4.20.1-r2
4.20.2-r0

Database specific

source 
"https://storage.googleapis.com/osv-test-cve-osv-conversion/alpine/ALPINE-CVE-2026-23553.json"