CVE-2024-43828 ext4: fix infinite loop when replaying fast_commit

2024-08-1709:21:47

Linux

www.cve.org

linux kernel

vulnerability

infinite loop

ext4

replay

fast_commit

integer overflow

fix

data corruption

EPSS

Percentile

5.0%

JSON

In the Linux kernel, the following vulnerability has been resolved:

ext4: fix infinite loop when replaying fast_commit

When doing fast_commit replay an infinite loop may occur due to an
uninitialized extent_status struct. ext4_ext_determine_insert_hole() does
not detect the replay and calls ext4_es_find_extent_range(), which will
return immediately without initializing the ‘es’ variable.

Because ‘es’ contains garbage, an integer overflow may happen causing an
infinite loop in this function, easily reproducible using fstest generic/039.

This commit fixes this issue by unconditionally initializing the structure
in function ext4_es_find_extent_range().

Thanks to Zhang Yi, for figuring out the real problem!

CNA Affected

[
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "unaffected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/ext4/extents_status.c"
    ],
    "versions": [
      {
        "version": "8016e29f4362",
        "lessThan": "5ed0496e383c",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "8016e29f4362",
        "lessThan": "0619f7750f2b",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "8016e29f4362",
        "lessThan": "181e63cd595c",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "8016e29f4362",
        "lessThan": "c6e67df64783",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "8016e29f4362",
        "lessThan": "81f819c537d2",
        "status": "affected",
        "versionType": "git"
      },
      {
        "version": "8016e29f4362",
        "lessThan": "907c3fe53225",
        "status": "affected",
        "versionType": "git"
      }
    ]
  },
  {
    "product": "Linux",
    "vendor": "Linux",
    "defaultStatus": "affected",
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "programFiles": [
      "fs/ext4/extents_status.c"
    ],
    "versions": [
      {
        "version": "5.10",
        "status": "affected"
      },
      {
        "version": "0",
        "lessThan": "5.10",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.10.224",
        "lessThanOrEqual": "5.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "5.15.165",
        "lessThanOrEqual": "5.15.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.1.103",
        "lessThanOrEqual": "6.1.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.6.44",
        "lessThanOrEqual": "6.6.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.10.3",
        "lessThanOrEqual": "6.10.*",
        "status": "unaffected",
        "versionType": "custom"
      },
      {
        "version": "6.11",
        "lessThanOrEqual": "*",
        "status": "unaffected",
        "versionType": "original_commit_for_fix"
      }
    ]
  }
]