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ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: ext4: avoid allocating blocks from corrupted group in ext4_mb_try_best_found() Determine if the group block bitmap is corrupted before using ac_b_ex in ext4_mb_try_best_found() to avoid allocating blocks from a group with a corrupted block bitmap in the following concurrency and making the situation worse. ext4_mb_regular_allocator ext4_lock_group(sb, group) ext4_mb_good_group // check if the group bbitmap is corrupted ext4_mb_complex_scan_group // Scan group gets ac_b_ex but doesn't use it ext4_unlock_group(sb, group) ext4_mark_group_bitmap_corrupted(group) // The block bitmap was corrupted during // the group unlock gap. ext4_mb_try_best_found ext4_lock_group(ac->ac_sb, group) ext4_mb_use_best_found mb_mark_used // Allocating blocks in block bitmap corrupted group

Announced Group revision 1
Original source ↗

CVE-2024-26773

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-2024-26773

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": "163a203ddb36c36d4a1c942aececda0cc8d06aa7",
        "lessThan": "21f8cfe79f776287459343e9cfa6055af61328ea",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "163a203ddb36c36d4a1c942aececda0cc8d06aa7",
        "lessThan": "260fc96283c0f594de18a1b045faf6d8fb42874d",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "163a203ddb36c36d4a1c942aececda0cc8d06aa7",
        "lessThan": "927794a02169778c9c2e7b25c768ab3ea8c1dc03",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "163a203ddb36c36d4a1c942aececda0cc8d06aa7",
        "lessThan": "4c21fa60a6f4606f6214a38f50612b17b2f738f5",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "163a203ddb36c36d4a1c942aececda0cc8d06aa7",
        "lessThan": "f97e75fa4e12b0aa0224e83fcbda8853ac2adf36",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "163a203ddb36c36d4a1c942aececda0cc8d06aa7",
        "lessThan": "0184747b552d6b5a14db3b7fcc3b792ce64dedd1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "163a203ddb36c36d4a1c942aececda0cc8d06aa7",
        "lessThan": "a2576ae9a35c078e488f2c573e9e6821d651fbbe",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "163a203ddb36c36d4a1c942aececda0cc8d06aa7",
        "lessThan": "4530b3660d396a646aad91a787b6ab37cf604b53",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "fs/ext4/mballoc.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "3.12"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "3.12",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "4.19.308",
        "versionType": "semver",
        "lessThanOrEqual": "4.19.*"
      },
      {
        "status": "unaffected",
        "version": "5.4.270",
        "versionType": "semver",
        "lessThanOrEqual": "5.4.*"
      },
      {
        "status": "unaffected",
        "version": "5.10.211",
        "versionType": "semver",
        "lessThanOrEqual": "5.10.*"
      },
      {
        "status": "unaffected",
        "version": "5.15.150",
        "versionType": "semver",
        "lessThanOrEqual": "5.15.*"
      },
      {
        "status": "unaffected",
        "version": "6.1.80",
        "versionType": "semver",
        "lessThanOrEqual": "6.1.*"
      },
      {
        "status": "unaffected",
        "version": "6.6.19",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.7.7",
        "versionType": "semver",
        "lessThanOrEqual": "6.7.*"
      },
      {
        "status": "unaffected",
        "version": "6.8",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "fs/ext4/mballoc.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2024-26773

Source reference: /cveMetadata/cveId

Publisher severity

high

Source reference: /containers/cna/metrics

Event
#26423 · Revision 1
Added to Heist Feed
Publisher date
Read the original announcement

Revision history

  1. CVE-2024-26773 · Revision 1Source updated