CVE-2023-46836
Fixed in a distro release EPSS <1%CVSS 4.7
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.
Products: xen
Distro releases
| Release | Package | Fixed in |
|---|---|---|
| Alpine 3.15 | xen | 4.15.5-r3 |
| Alpine 3.16 | xen | 4.16.5-r4 |
| Alpine 3.17 | xen | 4.16.5-r4 |
| Alpine 3.18 | xen | 4.17.2-r4 |
| Alpine 3.19 | xen | 4.17.2-r4 |
| Alpine 3.20 | xen | 4.17.2-r4 |
| Alpine 3.21 | xen | 4.17.2-r4 |
| Alpine 3.22 | xen | 4.17.2-r4 |
| Alpine 3.23 | xen | 4.17.2-r4 |
| Alpine 3.24 | xen | 4.17.2-r4 |
| Debian 12 | xen | 4.17.2+76-ge1f9cb16e2-1~deb12u1 |
| Debian 13 | xen | 4.17.2+76-ge1f9cb16e2-1 |
| Debian 14 | xen | 4.17.2+76-ge1f9cb16e2-1 |
| SUSE Enterprise Storage 7.1 | xen | 4.14.6_08-150300.3.60.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS | xen | 4.12.4_42-150100.3.98.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS | xen | 4.13.5_08-150200.3.83.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS | xen | 4.14.6_08-150300.3.60.1 |
| SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS | xen | 4.14.6_08-150300.3.60.1 |
| SUSE Linux Enterprise Micro 5.1 | xen | 4.14.6_08-150300.3.60.1 |
| SUSE Linux Enterprise Micro 5.2 | xen | 4.14.6_08-150300.3.60.1 |
| SUSE Linux Enterprise Micro 5.3 | xen | 4.16.5_08-150400.4.40.1 |
| SUSE Linux Enterprise Micro 5.4 | xen | 4.16.5_08-150400.4.40.1 |
| SUSE Linux Enterprise Micro 5.5 | xen | 4.17.3_02-150500.3.18.1 |
| SUSE Linux Enterprise Micro 5.5 | xen | 4.17.2_08-150500.3.15.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP4 | xen | 4.16.5_08-150400.4.40.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP5 | xen | 4.17.3_02-150500.3.18.1 |
| SUSE Linux Enterprise Module for Basesystem 15 SP5 | xen | 4.17.2_08-150500.3.15.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP4 | xen | 4.16.5_08-150400.4.40.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP5 | xen | 4.17.3_02-150500.3.18.1 |
| SUSE Linux Enterprise Module for Server Applications 15 SP5 | xen | 4.17.2_08-150500.3.15.1 |
| SUSE Linux Enterprise Server 12 SP5 | xen | 4.12.4_42-3.100.1 |
| SUSE Linux Enterprise Server 15 SP1-LTSS | xen | 4.12.4_42-150100.3.98.1 |
| SUSE Linux Enterprise Server 15 SP2-LTSS | xen | 4.13.5_08-150200.3.83.1 |
| SUSE Linux Enterprise Server 15 SP3-LTSS | xen | 4.14.6_08-150300.3.60.1 |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | xen | 4.12.4_42-3.100.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | xen | 4.12.4_42-150100.3.98.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | xen | 4.13.5_08-150200.3.83.1 |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | xen | 4.14.6_08-150300.3.60.1 |
| SUSE Linux Enterprise Software Development Kit 12 SP5 | xen | 4.12.4_42-3.100.1 |
| Ubuntu 16.04 LTS | xen | no fix |
| Ubuntu 18.04 LTS | xen | no fix |
| Ubuntu 20.04 LTS | xen | no fix |
| Ubuntu 22.04 LTS | xen | no fix |
| Ubuntu 24.04 LTS | xen | no fix |
| Ubuntu 25.10 | xen | no fix |
| Ubuntu 26.04 LTS | xen | no fix |
| Ubuntu 26.10 | xen | no fix |
| openSUSE Leap 15.4 | xen | 4.16.5_08-150400.4.40.1 |
| openSUSE Leap 15.5 | xen | 4.17.2_08-150500.3.15.1 |
| openSUSE Leap 15.5 | xen | 4.17.3_02-150500.3.18.1 |
| openSUSE Leap Micro 5.3 | xen | 4.16.5_08-150400.4.40.1 |
| openSUSE Leap Micro 5.4 | xen | 4.16.5_08-150400.4.40.1 |
| openSUSE Tumbleweed | xen | 4.18.0_02-1.1 |