VDB-245158 · CVE-2023-46836 · GCVE-0-2023-46836

Xen 4.15.x on AMD/Hygon IRQ memory corruption

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4.5	$0-$5k	0.00

Summaryinfo

A vulnerability was found in Xen 4.15.x on AMD/Hygon and classified as critical. Affected by this issue is some unknown functionality of the component IRQ Handler. Executing a manipulation can lead to memory corruption. This vulnerability appears as CVE-2023-46836. There is no available exploit. It is best practice to apply a patch to resolve this issue.

Detailsinfo

A vulnerability was found in Xen 4.15.x on AMD/Hygon (Virtualization Software). It has been declared as critical. This vulnerability affects an unknown code of the component IRQ Handler. The manipulation with an unknown input leads to a memory corruption vulnerability. The CWE definition for the vulnerability is CWE-119. The product performs operations on a memory buffer, but it can read from or write to a memory location that is outside of the intended boundary of the buffer. As an impact it is known to affect confidentiality, integrity, and availability. CVE summarizes:

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.

The weakness was presented 11/14/2023. The advisory is available at xenbits.xen.org. This vulnerability was named CVE-2023-46836 since 10/27/2023. The technical details are unknown and an exploit is not available.

Applying a patch is able to eliminate this problem. The bugfix is ready for download at xenbits.xen.org.

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Productinfo

Type

Virtualization Software

Name

Version

4.15.x

License

open-source

CPE 2.3info

CPE 2.2info

CVSSv4info

VulDB Vector: 🔍
VulDB Reliability: 🔍

CVSSv3info

VulDB Meta Base Score: 4.6
VulDB Meta Temp Score: 4.6

VulDB Base Score: 4.6
VulDB Temp Score: 4.4
VulDB Vector: 🔍
VulDB Reliability: 🔍

NVD Base Score: 4.7
NVD Vector: 🔍

CVSSv2info

AV	AC	Au	C	I	A
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Vector	Complexity	Authentication	Confidentiality	Integrity	Availability
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VulDB Base Score: 🔍
VulDB Temp Score: 🔍
VulDB Reliability: 🔍

Exploitinginfo

Class: Memory corruption
CWE: CWE-119
CAPEC: 🔍
ATT&CK: 🔍

Physical: Partially
Local: Yes
Remote: Partially

Availability: 🔍
Status: Not defined

EPSS Score: 🔍
EPSS Percentile: 🔍

Price Prediction: 🔍
Current Price Estimation: 🔍

0-Day	Unlock	Unlock	Unlock	Unlock
Today	Unlock	Unlock	Unlock	Unlock

Threat Intelligenceinfo

Interest: 🔍
Active Actors: 🔍
Active APT Groups: 🔍

Countermeasuresinfo

Recommended: Patch
Status: 🔍

0-Day Time: 🔍

Patch: xenbits.xen.org

Timelineinfo

10/27/2023 🔍
11/14/2023 +18 days 🔍
11/14/2023 +0 days 🔍
06/03/2025 +567 days 🔍

Sourcesinfo

Advisory: xenbits.xen.org
Status: Confirmed

CVE: CVE-2023-46836 (🔍)
GCVE (CVE): GCVE-0-2023-46836
GCVE (VulDB): GCVE-100-245158

Entryinfo

Created: 11/14/2023 15:42
Updated: 06/03/2025 19:39
Changes: 11/14/2023 15:42 (40), 06/03/2025 19:39 (27)
Complete: 🔍
Cache ID: 216::103