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CVE-2024-44948 In the Linux kernel, the following vulnerability has been resolved: x86/mtrr: Check if fixed MTRRs exist before saving…
Description
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
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux 6.11 | earliest → < 6.11 | 6.11 |
| Linux 6.10 | earliest → < 6.10.5 | 6.10.5 |
| Linux 6.6 | earliest → < 6.6.46 | 6.6.46 |
| Linux 6.1 | earliest → < 6.1.105 | 6.1.105 |
| Linux 5.15 | earliest → < 5.15.165 | 5.15.165 |
| Linux 5.10 | earliest → < 5.10.224 | 5.10.224 |
| Linux 5.4 | earliest → < 5.4.282 | 5.4.282 |
| Linux 4.19 | earliest → < 4.19.320 | 4.19.320 |
| Linux | 2.6.22 | No fix stated |
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| Product | Affected versions | Fixed in |
|---|---|---|
| SIMATIC S7-1500 TM MFP - GNU/Linux subsystem 1.1 | earliest → < 1.1.1 | 1.1.1 |
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