Tracker / CVE-2024-44948
CVE-2024-44948
In the Linux kernel, the following vulnerability has been resolved: x86/mtrr: Check if fixed MTRRs exist before saving them MTRRs have an obsolete fixed variant for fine grained caching control of the 640K-1MB region that uses separate MSRs. This fixed variant has a separate capability bit in the MTRR capability MSR. So far all x86 CPUs which support MTRR have this separate bit set, so it went unnoticed that mtrr_save_state() does not check the capability bit before accessing the fixed MTRR MSRs. Though on a CPU that does not support the fixed MTRR capability this results in a #GP. The #GP itself is harmless because the RDMSR fault is handled gracefully, but results in a WARN_ON(). Add the missing capability check to prevent this.
Affected products and versions
| linux | linux_kernel |
|---|---|
| linux | linux_kernel · 2.6.22 → 4.19.320 |
| linux | linux_kernel · 4.20 → 5.4.282 |
| linux | linux_kernel · 5.11 → 5.15.165 |
| linux | linux_kernel · 5.16 → 6.1.105 |
| linux | linux_kernel · 5.5 → 5.10.224 |
| linux | linux_kernel · 6.2 → 6.6.46 |
| linux | linux_kernel · 6.7 → 6.10.5 |