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x86/mtrr: Check if fixed MTRRs exist before saving them

Type: advisorySource: Official CVE List1 source record

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.

Announced Source revision 1
Original source ↗

CVE-2024-44948

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2024-44948

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2b1f6278d77c1f2f669346fc2bb48012b5e9495a",
        "lessThan": "34f36e6ee5bd7eff8b2adcd9fcaef369f752d82e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b1f6278d77c1f2f669346fc2bb48012b5e9495a",
        "lessThan": "06c1de44d378ec5439db17bf476507d68589bfe9",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b1f6278d77c1f2f669346fc2bb48012b5e9495a",
        "lessThan": "450b6b22acdaac67a18eaf5ed498421ffcf10051",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b1f6278d77c1f2f669346fc2bb48012b5e9495a",
        "lessThan": "ca7d00c5656d1791e28369919e3e10febe9c3b16",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b1f6278d77c1f2f669346fc2bb48012b5e9495a",
        "lessThan": "8aa79dfb216b865e96ff890bc4ea71650f9bc8d7",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b1f6278d77c1f2f669346fc2bb48012b5e9495a",
        "lessThan": "8a90d3fc7c24608548d3a750671f9dac21d1a462",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b1f6278d77c1f2f669346fc2bb48012b5e9495a",
        "lessThan": "388f1c954019f253a8383f7eb733f38d541e10b6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "2b1f6278d77c1f2f669346fc2bb48012b5e9495a",
        "lessThan": "919f18f961c03d6694aa726c514184f2311a4614",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "arch/x86/kernel/cpu/mtrr/mtrr.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.22"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.22",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "4.19.320",
        "versionType": "semver",
        "lessThanOrEqual": "4.19.*"
      },
      {
        "status": "unaffected",
        "version": "5.4.282",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.224",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.165",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.105",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.46",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.10.5",
        "versionType": "semver",
        "lessThanOrEqual": "6.10.*"
      },
      {
        "status": "unaffected",
        "version": "6.11",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "arch/x86/kernel/cpu/mtrr/mtrr.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2024-44948

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#26700 · Revision 1
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Publisher date
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