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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 22/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.24% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 06c1de44d378ec5439db17bf476507d68589bfe9, 34f36e6ee5bd7eff8b2adcd9fcaef369f752d82e, 388f1c954019f253a8383f7eb733f38d541e10b6.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 06c1de44d378ec5439db17bf476507d68589bfe9, 34f36e6ee5bd7eff8b2adcd9fcaef369f752d82e, 388f1c954019f253a8383f7eb733f38d541e10b6 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

MediumCVSS 5.5 · v3.1—No exploit Fix available
Published
Sep 4, 2024
Updated
Oct 15, 2026
EPSS
0.2% · 15th percentile
CWE
—

Report tools

JSON

Action score

22

Monitor

Low priority for now.

CVSS
22 / 40 · 5.5 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2024-44948

When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

VendorProduct
linuxlinux kernel

Affected versions

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel2.6.22 and later · before 4.19.320
  • linux linux kernel4.20 and later · before 5.4.282
  • linux linux kernel5.5 and later · before 5.10.224
  • linux linux kernel5.11 and later · before 5.15.165
  • linux linux kernel5.16 and later · before 6.1.105
  • linux linux kernel6.2 and later · before 6.6.46
  • linux linux kernel6.7 and later · before 6.10.5
  • linux linux kernel6.11

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 2.6.22affected
    • 2b1f6278d77c1f2f669346fc2bb48012b5e9495a and later · before 34f36e6ee5bd7eff8b2adcd9fcaef369f752d82eaffected · git
    • 2b1f6278d77c1f2f669346fc2bb48012b5e9495a and later · before 06c1de44d378ec5439db17bf476507d68589bfe9affected · git
    • 2b1f6278d77c1f2f669346fc2bb48012b5e9495a and later · before 450b6b22acdaac67a18eaf5ed498421ffcf10051affected · git
    • 2b1f6278d77c1f2f669346fc2bb48012b5e9495a and later · before ca7d00c5656d1791e28369919e3e10febe9c3b16affected · git
    • 2b1f6278d77c1f2f669346fc2bb48012b5e9495a and later · before 8aa79dfb216b865e96ff890bc4ea71650f9bc8d7affected · git
    • 2b1f6278d77c1f2f669346fc2bb48012b5e9495a and later · before 8a90d3fc7c24608548d3a750671f9dac21d1a462affected · git
    • 2b1f6278d77c1f2f669346fc2bb48012b5e9495a and later · before 388f1c954019f253a8383f7eb733f38d541e10b6affected · git
    • 2b1f6278d77c1f2f669346fc2bb48012b5e9495a and later · before 919f18f961c03d6694aa726c514184f2311a4614affected · git
    • before 2.6.22not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.106-16.1.106-1
Debian:13linuxbefore 6.10.6-16.10.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2024-45007Sep 4, 2024 · char: xillybus: Don't destroy workqueue from work item running on it
    22Monitor
  • ← EarlierCVE-2024-45008Sep 4, 2024 · Input: MT - limit max slots
    22Monitor
  • Later →CVE-2024-44951Sep 4, 2024 · serial: sc16is7xx: fix TX fifo corruption
    31Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux06c1de44d378ec5439db17bf476507d68589bfe9Vendor (CNA)
Linux Linux34f36e6ee5bd7eff8b2adcd9fcaef369f752d82eVendor (CNA)
Linux Linux388f1c954019f253a8383f7eb733f38d541e10b6Vendor (CNA)
Linux Linux450b6b22acdaac67a18eaf5ed498421ffcf10051Vendor (CNA)
Linux Linux8a90d3fc7c24608548d3a750671f9dac21d1a462Vendor (CNA)
Linux Linux8aa79dfb216b865e96ff890bc4ea71650f9bc8d7Vendor (CNA)
Linux Linux919f18f961c03d6694aa726c514184f2311a4614Vendor (CNA)
Linux Linuxca7d00c5656d1791e28369919e3e10febe9c3b16Vendor (CNA)
debian:linux6.1.106-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

No history yet (it accumulates with the daily EPSS job).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
none
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
None
Integrity impact
None
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (10 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records