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x86/mm: Fix pti_clone_pgtable() alignment assumption

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: x86/mm: Fix pti_clone_pgtable() alignment assumption Guenter reported dodgy crashes on an i386-nosmp build using GCC-11 that had the form of endless traps until entry stack exhaust and then #DF from the stack guard. It turned out that pti_clone_pgtable() had alignment assumptions on the start address, notably it hard assumes start is PMD aligned. This is true on x86_64, but very much not true on i386. These assumptions can cause the end condition to malfunction, leading to a 'short' clone. Guess what happens when the user mapping has a short copy of the entry text? Use the correct increment form for addr to avoid alignment assumptions.

Announced Source revision 1
Original source ↗

CVE-2024-44965

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-2024-44965

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": "16a3fe634f6a568c6234b8747e5d50487fed3526",
        "lessThan": "18da1b27ce16a14a9b636af9232acb4fb24f4c9e",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "16a3fe634f6a568c6234b8747e5d50487fed3526",
        "lessThan": "25a727233a40a9b33370eec9f0cad67d8fd312f8",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "16a3fe634f6a568c6234b8747e5d50487fed3526",
        "lessThan": "d00c9b4bbc442d99e1dafbdfdab848bc1ead73f6",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "16a3fe634f6a568c6234b8747e5d50487fed3526",
        "lessThan": "4d143ae782009b43b4f366402e5c37f59d4e4346",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "16a3fe634f6a568c6234b8747e5d50487fed3526",
        "lessThan": "5c580c1050bcbc15c3e78090859d798dcf8c9763",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "16a3fe634f6a568c6234b8747e5d50487fed3526",
        "lessThan": "ca07aab70dd3b5e7fddb62d7a6ecd7a7d6d0b2ed",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "16a3fe634f6a568c6234b8747e5d50487fed3526",
        "lessThan": "df3eecb5496f87263d171b254ca6e2758ab3c35c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "16a3fe634f6a568c6234b8747e5d50487fed3526",
        "lessThan": "41e71dbb0e0a0fe214545fe64af031303a08524c",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "arch/x86/mm/pti.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "4.19"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "4.19",
        "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/mm/pti.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2024-44965

Source reference: /cveMetadata/cveId

Publisher severity

No explicit severity was provided.

Event
#26705 · Revision 1
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Publisher date
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