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Debian: CVE-2023-46836: xen -- security update

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Debian: CVE-2023-46836: xen -- security update

Severity
4
CVSS
(AV:L/AC:M/Au:S/C:C/I:N/A:N)
Published
01/05/2024
Created
07/31/2024
Added
07/30/2024
Modified
01/28/2025

Description

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.

Solution(s)

  • debian-upgrade-xen

References

  • https://attackerkb.com/topics/cve-2023-46836
  • CVE - 2023-46836
  • 查看数 705
  • 已创建
  • 最后回复

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