Time-of-check Time-of-use (TOCTOU) Affecting kernel-source package, versions <5.14.21-150500.55.31.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.04% (11th percentile)

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  • Snyk IDSNYK-SLES155-KERNELSOURCE-5965918
  • published14 Oct 2023
  • disclosed13 Nov 2023

Introduced: 14 Oct 2023

CVE-2023-4155  (opens in a new tab)
CWE-367  (opens in a new tab)

How to fix?

Upgrade SLES:15.5 kernel-source to version 5.14.21-150500.55.31.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-source package and not the kernel-source package as distributed by SLES. See How to fix? for SLES:15.5 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).

CVSS Scores

version 3.1