DEBIAN-CVE-2023-54172
Record from OSV · Published December 30, 2025
In the Linux kernel, the following vulnerability has been resolved: x86/hyperv: Disable IBT when hypercall page lacks ENDBR instruction On hardware that supports Indirect Branch Tracking (IBT), Hyper-V VMs with ConfigVersion 9.3 or later support IBT in the guest. However, current versions of Hyper-V have a bug in that there's not an ENDBR64 instruction at the beginning of the hypercall page. Since hypercalls are made with an indirect call to the hypercall page, all hypercall attempts fail with an exception and Linux panics. A Hyper-V fix is in progress to add ENDBR64. But guard against the Linux panic by clearing X86_FEATURE_IBT if the hypercall page doesn't start with ENDBR. The VM will boot and run without IBT. If future Linux 32-bit kernels were to support IBT, additional hypercall page hackery would be needed to make IBT work for such kernels in a Hyper-V VM.
Fixed versions
Upgrade to a fixed version or later. Language registries are listed first, then Linux distributions, then vendor products.
| Package | Ecosystem | Fixed in |
|---|---|---|
| linux | Debian:12 | 6.1.52-1 |
| linux | Debian:13 | 6.4.11-1 |
| linux | Debian:14 | 6.4.11-1 |
Affected products
| Vendor | Product | Versions |
|---|---|---|
| Debian:12 | linux | 6.1.38-4~bpo11+1, 0, 6.1.27-1 |
| Debian:13 | linux | 0 |
| Debian:14 | linux | 0 |
Timeline
- Dec 30, 2025 CVE Published
- Oct 26, 2026 CVE Updated
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