CVE-2023-46836
published 2024-01-05CVE-2023-46836: 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…
PriorityP422medium4.7CVSS 3.1
AVLACHPRLUINSUCHINAN
EPSS
0.25%
16.4th percentile
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.
Affected
13 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| debian | xen | < xen 4.17.2+76-ge1f9cb16e2-1~deb12u1 (bookworm) | xen 4.17.2+76-ge1f9cb16e2-1~deb12u1 (bookworm) |
| xen | xen | >= 0 < 4.15.5-r3 | 4.15.5-r3 |
| xen | xen | >= 0 < 4.16.5-r4 | 4.16.5-r4 |
| xen | xen | >= 0 < 4.16.5-r4 | 4.16.5-r4 |
| xen | xen | >= 0 < 4.17.2-r4 | 4.17.2-r4 |
| xen | xen | >= 0 < 4.17.2-r4 | 4.17.2-r4 |
| xen | xen | >= 0 < 4.17.2-r4 | 4.17.2-r4 |
| xen | xen | >= 0 < 4.17.2-r4 | 4.17.2-r4 |
| xen | xen | >= 0 < 4.17.2-r4 | 4.17.2-r4 |
| xen | xen | >= 0 < 4.17.2-r4 | 4.17.2-r4 |
| xen | xen | >= 0 < 4.17.2+76-ge1f9cb16e2-1~deb12u1 | 4.17.2+76-ge1f9cb16e2-1~deb12u1 |
| xen | xen | >= 0 < 4.17.2+76-ge1f9cb16e2-1 | 4.17.2+76-ge1f9cb16e2-1 |
| xen | xen | >= 0 < 4.17.2+76-ge1f9cb16e2-1 | 4.17.2+76-ge1f9cb16e2-1 |
CVSS provenance
nvdv3.14.7MEDIUMCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:N/A:N
osv4.7MEDIUM
vendor_debian4.7MEDIUM
Stop checking back — get the weekly exploitation signal.
Every Monday: what got weaponized or added to CISA KEV in the last seven days — each CVE cross-linked to its PoC, Nuclei template, and detection rule. Free, one email a week, unsubscribe in one click.
GHSA
GHSA-4rmw-8gh7-w6g3: The fixes for XSA-422 (Branch Type Confusion) and XSA-434 (Speculative
Return Stack Overflow) are not IRQ-safe
ghsa_unreviewed·2024-01-05
CVE-2023-46836 [MEDIUM] GHSA-4rmw-8gh7-w6g3: The fixes for XSA-422 (Branch Type Confusion) and XSA-434 (Speculative
Return Stack Overflow) are not IRQ-safe
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.
OSV
CVE-2023-46836: The fixes for XSA-422 (Branch Type Confusion) and XSA-434 (Speculative Return Stack Overflow) are not IRQ-safe
osv·2024-01-05·CVSS 4.7
CVE-2023-46836 [MEDIUM] CVE-2023-46836: The fixes for XSA-422 (Branch Type Confusion) and XSA-434 (Speculative Return Stack Overflow) are not IRQ-safe
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.
OSV
CVE-2023-46836: The fixes for XSA-422 (Branch Type Confusion) and XSA-434 (Speculative
Return Stack Overflow) are not IRQ-safe
osv·2024-01-05·CVSS 4.7
CVE-2023-46836 [MEDIUM] CVE-2023-46836: The fixes for XSA-422 (Branch Type Confusion) and XSA-434 (Speculative
Return Stack Overflow) are not IRQ-safe
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.
Debian
CVE-2023-46836: xen - The fixes for XSA-422 (Branch Type Confusion) and XSA-434 (Speculative Return St...
vendor_debian·2023·CVSS 4.7
CVE-2023-46836 [MEDIUM] CVE-2023-46836: xen - The fixes for XSA-422 (Branch Type Confusion) and XSA-434 (Speculative Return St...
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.
Scope: local
bookworm: resolved (fixed in 4.17.2+76-ge1f9cb16e2-1~deb12u1)
bullseye: open
forky: resolved (fixed in 4.17.2+76-ge1f9cb16e2-1)
sid: resolved (fixed in 4.17.2+76
No detection rules found.
No public exploits indexed.
No writeups or analysis indexed.
2024-01-05
Published