- Vulnerability/
- CVE-2024-44948
CVE-2024-44948: x86/mtrr: Check if fixed MTRRs exist before saving them
First published: Wed Sep 04 2024(Updated: )
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.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | <=5.10.223-1 | 5.10.226-1 6.1.115-1 6.1.119-1 6.12.5-1 6.12.6-1 |
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Reference Links
- https://git.kernel.org/stable/c/06c1de44d378ec5439db17bf476507d68589bfe9
- https://git.kernel.org/stable/c/34f36e6ee5bd7eff8b2adcd9fcaef369f752d82e
- https://git.kernel.org/stable/c/388f1c954019f253a8383f7eb733f38d541e10b6
- https://git.kernel.org/stable/c/450b6b22acdaac67a18eaf5ed498421ffcf10051
- https://git.kernel.org/stable/c/8a90d3fc7c24608548d3a750671f9dac21d1a462
- https://git.kernel.org/stable/c/8aa79dfb216b865e96ff890bc4ea71650f9bc8d7
- https://git.kernel.org/stable/c/919f18f961c03d6694aa726c514184f2311a4614
- https://git.kernel.org/stable/c/ca7d00c5656d1791e28369919e3e10febe9c3b16
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-44948
- https://nvd.nist.gov/vuln/detail/CVE-2024-44948
- https://launchpad.net/bugs/cve/CVE-2024-44948
- https://security-tracker.debian.org/tracker/CVE-2024-44948
- https://ubuntu.com/security/CVE-2024-44948
- https://git.kernel.org/linus/919f18f961c03d6694aa726c514184f2311a4614
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