Time-of-check Time-of-use (TOCTOU) Affecting kernel-livepatch-5_14_21-150400_24_92-default package, versions <1-150400.9.3.1


Severity

Recommended
0.0
medium
0
10

Based on SUSE Linux Enterprise Server security rating.

Threat Intelligence

EPSS
0.04% (12th percentile)

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  • Snyk IDSNYK-SLES154-KERNELLIVEPATCH514211504002492DEFAULT-5965581
  • published14 Oct 2023
  • disclosed13 Oct 2023

Introduced: 13 Oct 2023

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

How to fix?

Upgrade SLES:15.4 kernel-livepatch-5_14_21-150400_24_92-default to version 1-150400.9.3.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream kernel-livepatch-5_14_21-150400_24_92-default package and not the kernel-livepatch-5_14_21-150400_24_92-default package as distributed by SLES. See How to fix? for SLES:15.4 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