CVE-2024-44948x86/mtrr: Check if fixed MTRRs exist before saving them
- 5.5MediumCVSS base score
- 0.24%Exploitation in 30 daysEPSS · top 85% of all CVEs
- NoKnown exploitednot in CISA's KEV catalog
- NonePublic exploitsnone known yet
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.
Timeline
ID reserved
By Linux
- 14 days later
· 14 days later
Published
- 2 years later
· 2 years later
Record updated
Changes after publication (a new score, a public exploit, EPSS crossing 1, 10 or 50 %, leaving KEV) are kept since November 2026; earlier ones are not known.
Scores
| Scored by | CVSS | Score | Vector |
|---|---|---|---|
| NVDNVD · Modified | 3.1 | Medium5.5 | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
- EPSS (exploitation in 30 days)
- 0.24% · top 85% of all CVEs (14 Nov 2026)
- CISA SSVC
- Exploitation: none · Automatable: no · Technical impact: partial
The list uses the assigner's score when there is one, then CISA's, then NVD's: Medium 5.5.
Affected products
- affected 2b1f6278d77c1f2f669346fc2bb48012b5e9495a – < 34f36e6ee5bd7eff8b2adcd9fcaef369f752d82e
- affected 2b1f6278d77c1f2f669346fc2bb48012b5e9495a – < 06c1de44d378ec5439db17bf476507d68589bfe9
- affected 2b1f6278d77c1f2f669346fc2bb48012b5e9495a – < 450b6b22acdaac67a18eaf5ed498421ffcf10051
- affected 2b1f6278d77c1f2f669346fc2bb48012b5e9495a – < ca7d00c5656d1791e28369919e3e10febe9c3b16
- affected 2b1f6278d77c1f2f669346fc2bb48012b5e9495a – < 8aa79dfb216b865e96ff890bc4ea71650f9bc8d7
- affected 2b1f6278d77c1f2f669346fc2bb48012b5e9495a – < 8a90d3fc7c24608548d3a750671f9dac21d1a462
- affected 2b1f6278d77c1f2f669346fc2bb48012b5e9495a – < 388f1c954019f253a8383f7eb733f38d541e10b6
- affected 2b1f6278d77c1f2f669346fc2bb48012b5e9495a – < 919f18f961c03d6694aa726c514184f2311a4614
- affected 2.6.22
- unaffected < 2.6.22
- unaffected 4.19.320 – ≤ 4.19.*
- unaffected 5.4.282 – ≤ 5.4.*
- unaffected 5.10.224 – ≤ 5.10.*
- unaffected 5.15.165 – ≤ 5.15.*
- unaffected 6.1.105 – ≤ 6.1.*
- unaffected 6.6.46 – ≤ 6.6.*
- unaffected 6.10.5 – ≤ 6.10.*
- unaffected 6.11 – ≤ *
References
References11
- https://git.kernel.org/stable/c/34f36e6ee5bd7eff8b2adcd9fcaef369f752d82e (opens in a new tab)
- https://git.kernel.org/stable/c/06c1de44d378ec5439db17bf476507d68589bfe9 (opens in a new tab)
- https://git.kernel.org/stable/c/450b6b22acdaac67a18eaf5ed498421ffcf10051 (opens in a new tab)
- https://git.kernel.org/stable/c/ca7d00c5656d1791e28369919e3e10febe9c3b16 (opens in a new tab)
- https://git.kernel.org/stable/c/8aa79dfb216b865e96ff890bc4ea71650f9bc8d7 (opens in a new tab)
- https://git.kernel.org/stable/c/8a90d3fc7c24608548d3a750671f9dac21d1a462 (opens in a new tab)
- https://git.kernel.org/stable/c/388f1c954019f253a8383f7eb733f38d541e10b6 (opens in a new tab)
- https://git.kernel.org/stable/c/919f18f961c03d6694aa726c514184f2311a4614 (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html (opens in a new tab)
- https://lists.debian.org/debian-lts-announce/2024/10/msg00003.html (opens in a new tab)
- https://cert-portal.siemens.com/productcert/html/ssa-265688.html (opens in a new tab)
Sources
The same CVE in the primary databases and aggregators, to check against.
- CVE.org record (opens in a new tab)
- CVE List JSON (GitHub) (opens in a new tab)
- NVD (opens in a new tab)
- FIRST EPSS (opens in a new tab)
- EUVD EUVD-2024-41153 (opens in a new tab)
- OSV.dev (opens in a new tab)
- GitHub Advisories (opens in a new tab)
- CIRCL Vulnerability-Lookup (opens in a new tab)
Badge for a README or a ticket
[](https://cveledger.app/cve/CVE-2024-44948)Record last updated .