CVE-2023-46836 Affecting xen-tools-xendomains-wait-disk package, versions <4.17.2_08-150500.3.15.1


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-XENTOOLSXENDOMAINSWAITDISK-6069788
  • published18 Nov 2023
  • disclosed17 Nov 2023

Introduced: 17 Nov 2023

CVE-2023-46836  (opens in a new tab)

How to fix?

Upgrade SLES:15.5 xen-tools-xendomains-wait-disk to version 4.17.2_08-150500.3.15.1 or higher.

NVD Description

Note: Versions mentioned in the description apply only to the upstream xen-tools-xendomains-wait-disk package and not the xen-tools-xendomains-wait-disk package as distributed by SLES. See How to fix? for SLES:15.5 relevant fixed versions and status.

The fixes for XSA-422 (Branch Type Confusion) and XSA-434 (Speculative Return Stack Overflow) are not IRQ-safe. It was believed that the mitigations always operated in contexts with IRQs disabled.

However, the original XSA-254 fix for Meltdown (XPTI) deliberately left interrupts enabled on two entry paths; one unconditionally, and one conditionally on whether XPTI was active.

As BTC/SRSO and Meltdown affect different CPU vendors, the mitigations are not active together by default. Therefore, there is a race condition whereby a malicious PV guest can bypass BTC/SRSO protections and launch a BTC/SRSO attack against Xen.

CVSS Scores

version 3.1