What’s Vulnerable › Vulnerabilities

CVE-2024-31142: x86: Incorrect logic for BTC/SRSO mitigations

• Severity: high (CVSS 7.5 v3.1)
• Exploited in the wild: not listed in CISA KEV
• EPSS: 17.4% probability of exploitation in the next 30 days
• Public exploit or detection template: none known
• Published: 2024-05-16 · updated 2026-06-17
• Weakness: CWE-693

Description

Because of a logical error in XSA-407 (Branch Type Confusion), the mitigation is not applied properly when it is intended to be used. XSA-434 (Speculative Return Stack Overflow) uses the same infrastructure, so is equally impacted. For more details, see: https://xenbits.xen.org/xsa/advisory-407.html https://xenbits.xen.org/xsa/advisory-434.html

Affected products

• Fedoraproject Fedora: 38, 40
• xen: before 4.15.6; from 4.16.0 before 4.16.6; from 4.17.0 before 4.17.4; from 4.18.0 before 4.18.2 — fixed in 4.15.6, 4.16.6, 4.17.4, 4.18.2

How to fix

Upgrade to a fixed version: xen 4.15.6, 4.16.6, 4.17.4, 4.18.2. Check the vendor advisory for mitigations.

References

• https://xenbits.xenproject.org/xsa/advisory-455.html
• http://xenbits.xen.org/xsa/advisory-455.html
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/D5OK6MH75S7YWD34EWW7QIZTS627RIE3/
• https://lists.fedoraproject.org/archives/list/package-announce@lists.fedoraproject.org/message/RYAZ7P6YFJ2E3FHKAGIKHWS46KYMMTZH/
• https://xenbits.xenproject.org/xsa/advisory-455.html

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