Time-of-check Time-of-use (TOCTOU) Affecting kernel-rt-debug-core package, versions <0:4.18.0-513.5.1.rt7.307.el8_9
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Test your applications- Snyk ID SNYK-CENTOS8-KERNELRTDEBUGCORE-5822360
- published 7 Aug 2023
- disclosed 4 Aug 2023
Introduced: 4 Aug 2023
CVE-2023-4155 Open this link in a new tabHow to fix?
Upgrade Centos:8 kernel-rt-debug-core to version 0:4.18.0-513.5.1.rt7.307.el8_9 or higher.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-core package and not the kernel-rt-debug-core package as distributed by Centos.
See How to fix? for Centos:8 relevant fixed versions and status.
A flaw was found in KVM AMD Secure Encrypted Virtualization (SEV) in the Linux kernel. A KVM guest using SEV-ES or SEV-SNP with multiple vCPUs can trigger a double fetch race condition vulnerability and invoke the VMGEXIT handler recursively. If an attacker manages to call the handler multiple times, they can trigger a stack overflow and cause a denial of service or potentially guest-to-host escape in kernel configurations without stack guard pages (CONFIG_VMAP_STACK).