CVE-2024-44948
Last modified
CVE-2024-44948 is a medium-severity vulnerability rated 5.5/10 on the CVSS scale. 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. EPSS estimates a 0.24% chance of exploitation in the next 30 days.
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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected Software
| Vendor | Product | Versions | Update |
|---|---|---|---|
| Linux | Linux Kernel | >= 2.6.22, < 4.19.320 | — |
| Linux | Linux Kernel | >= 4.20, < 5.4.282 | — |
| Linux | Linux Kernel | >= 5.5, < 5.10.224 | — |
| Linux | Linux Kernel | >= 5.11, < 5.15.165 | — |
| Linux | Linux Kernel | >= 5.16, < 6.1.105 | — |
| Linux | Linux Kernel | >= 6.2, < 6.6.46 | — |
| Linux | Linux Kernel | >= 6.7, < 6.10.5 | — |
| Linux | Linux Kernel | 6.11 | Rc1 |
References
Timeline
- Published
- Last Modified
- Status
- Modified
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