Medium 5.5Published Sep 4, 2024

CVE-2024-44948x86/mtrr: Check if fixed MTRRs exist before saving them

Updated under an hour ago (Oct 27, 2026, 12:30 AM ET)

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Exploited in the last 30 days

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.

CVSS: 5.5 MEDIUM (v3.1, NVD)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 2b1f6278d77c1f2f669346fc2bb48012b5e9495a before 34f36e6ee5bd7eff8b2adcd9fcaef369f752d82e; from 2b1f6278d77c1f2f669346fc2bb48012b5e9495a before 06c1de44d378ec5439db17bf476507d68589bfe9; from 2b1f6278d77c1f2f669346fc2bb48012b5e9495a before 450b6b22acdaac67a18eaf5ed498421ffcf10051; from 2b1f6278d77c1f2f669346fc2bb48012b5e9495a before ca7d00c5656d1791e28369919e3e10febe9c3b16; from 2b1f6278d77c1f2f669346fc2bb48012b5e9495a before 8aa79dfb216b865e96ff890bc4ea71650f9bc8d7; from 2b1f6278d77c1f2f669346fc2bb48012b5e9495a before 8a90d3fc7c24608548d3a750671f9dac21d1a462; from 2b1f6278d77c1f2f669346fc2bb48012b5e9495a before 388f1c954019f253a8383f7eb733f38d541e10b6; from 2b1f6278d77c1f2f669346fc2bb48012b5e9495a before 919f18f961c03d6694aa726c514184f2311a4614	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	before V1.1.1	CISA ADP
linux linux_kernel linux:linux_kernel	from 2.6.22 before 4.19.320; from 4.20 before 5.4.282; from 5.5 before 5.10.224; from 5.11 before 5.15.165; from 5.16 before 6.1.105; from 6.2 before 6.6.46; from 6.7 before 6.10.5; 6.11; and 1 more ranges	NVD

References

References

https://git.kernel.org/stable/c/34f36e6ee5bd7eff8b2adcd9fcaef369f752d82e	patch
https://git.kernel.org/stable/c/06c1de44d378ec5439db17bf476507d68589bfe9	patch
https://git.kernel.org/stable/c/450b6b22acdaac67a18eaf5ed498421ffcf10051	patch
https://git.kernel.org/stable/c/ca7d00c5656d1791e28369919e3e10febe9c3b16	patch
https://git.kernel.org/stable/c/8aa79dfb216b865e96ff890bc4ea71650f9bc8d7	patch
https://git.kernel.org/stable/c/8a90d3fc7c24608548d3a750671f9dac21d1a462	patch
https://git.kernel.org/stable/c/388f1c954019f253a8383f7eb733f38d541e10b6	patch
https://git.kernel.org/stable/c/919f18f961c03d6694aa726c514184f2311a4614	patch
https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html
https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
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The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.