Debian Security Bug TrackerDEBIANCVE:CVE-2023-46836CVE-2023-46836
4.7 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
6.2 Medium
AI Score
Confidence
Low
0.0004 Low
EPSS
Percentile
9.0%
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.
| OS | Version | Architecture | Package | Version | Filename |
|---|---|---|---|---|---|
| Debian | 12 | all | xen | < 4.17.2+76-ge1f9cb16e2-1~deb12u1 | xen_4.17.2+76-ge1f9cb16e2-1~deb12u1_all.deb |
| Debian | 11 | all | xen | <= 4.14.6-1 | xen_4.14.6-1_all.deb |
| Debian | 999 | all | xen | < 4.17.2+76-ge1f9cb16e2-1 | xen_4.17.2+76-ge1f9cb16e2-1_all.deb |
| Debian | 13 | all | xen | < 4.17.2+76-ge1f9cb16e2-1 | xen_4.17.2+76-ge1f9cb16e2-1_all.deb |
Related
4.7 Medium
CVSS3
Attack Vector
LOCAL
Attack Complexity
HIGH
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
NONE
Availability Impact
NONE
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
6.2 Medium
AI Score
Confidence
Low
0.0004 Low
EPSS
Percentile
9.0%