CVE-2024-26601 (GCVE-0-2024-26601)

Vulnerability from cvelistv5 – Published: 2024-02-24 14:56 – Updated: 2026-08-05 11:26
VLAI
Title
ext4: regenerate buddy after block freeing failed if under fc replay
Summary
In the Linux kernel, the following vulnerability has been resolved: ext4: regenerate buddy after block freeing failed if under fc replay This mostly reverts commit 6bd97bf273bd ("ext4: remove redundant mb_regenerate_buddy()") and reintroduces mb_regenerate_buddy(). Based on code in mb_free_blocks(), fast commit replay can end up marking as free blocks that are already marked as such. This causes corruption of the buddy bitmap so we need to regenerate it in that case.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
SSVC
Exploitation: none Automatable: no Technical Impact: partial
CISA Coordinator (v2.0.3)
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 0983142c5f17a62055ec851372273c3bc77e4788 , < 94ebf71bddbcd4ab1ce43ae32c6cb66396d2d51a (git)
Affected: 6bd97bf273bdb4944904e57480f6545bca48ad77 , < c1317822e2de80e78f137d3a2d99febab1b80326 (git)
Affected: 6bd97bf273bdb4944904e57480f6545bca48ad77 , < 78327acd4cdc4a1601af718b781eece577b6b7d4 (git)
Affected: 6bd97bf273bdb4944904e57480f6545bca48ad77 , < ea42d6cffb0dd27a417f410b9d0011e9859328cb (git)
Affected: 6bd97bf273bdb4944904e57480f6545bca48ad77 , < 6b0d48647935e4b8c7b75d1eccb9043fcd4ee581 (git)
Affected: 6bd97bf273bdb4944904e57480f6545bca48ad77 , < c9b528c35795b711331ed36dc3dbee90d5812d4e (git)
Affected: 5.10.181 , < 5.10.211 (semver)
Create a notification for this product.
Linux Linux Affected: 5.11
Unaffected: 0 , < 5.11 (semver)
Unaffected: 5.10.211 , ≤ 5.10.* (semver)
Unaffected: 5.15.150 , ≤ 5.15.* (semver)
Unaffected: 6.1.78 , ≤ 6.1.* (semver)
Unaffected: 6.6.17 , ≤ 6.6.* (semver)
Unaffected: 6.7.5 , ≤ 6.7.* (semver)
Unaffected: 6.8 , ≤ * (original_commit_for_fix)
Create a notification for this product.
Show details on NVD website
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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-08-04T19:11:53+00:00",
      "cve": "CVE-2024-26601",
      "id": "CVE-2024-26601",
      "initial_release_date": "2024-02-24T00:00:00+00:00",
      "product_status:fixed": "793",
      "product_status:known_affected": "22",
      "product_status:known_not_affected": "99",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ext4: regenerate buddy after block freeing failed if under fc replay",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2024/cve-2024-26601.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-08-05T01:01:53Z",
      "cve": "CVE-2024-26601",
      "id": "CVE-2024-26601",
      "initial_release_date": "2024-02-27T03:54:37Z",
      "product_status:known_affected": "355",
      "product_status:known_not_affected": "243",
      "product_status:recommended": "734",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2024-26601",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2024-26601.json",
      "version": "88"
    },
    "vulnrichment": {
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There is no network-facing consumer of this path.\\nAC:L - The attacker fully authors the filesystem image \\u2014 fast-commit DEL_RANGE tags, extent trees and block bitmaps \\u2014 so arranging a free of an already-free block is deterministic, with no race or memory-layout condition outside their control.\\nPR:L - An unprivileged local user supplies the crafted ext4 image via removable media or a loop/user-mountable device; udisks2-style automounters and autofs perform the mount, and mounting in a user namespace also reaches this code without real root.\\nUI:N - Automount daemons mount attacker-supplied removable media without any action by another user, and the fc replay runs unconditionally during that mount.\\nS:U - The corruption is confined to ext4\u0027s in-kernel allocator metadata and the mounted filesystem; it stays within the kernel\u0027s own security authority with no VM/IOMMU boundary crossed.\\nC:H - A group left with an inflated `bb_free` and a stale buddy is not quarantined, so mballoc can hand the attacker blocks whose true state it has lost track of, exposing residual on-disk contents of other files; the inconsistent metadata is also read back out of bounds of what the bitmap actually describes.\\nI:H - The block allocator\u0027s authoritative accounting is left corrupt and the group stays in service, so subsequent allocations write through aliased/incorrectly-tracked blocks, corrupting other files\u0027 data and on-disk filesystem metadata.\\nA:H - The desynchronized buddy reaches `BUG_ON`s in `mb_mark_used()` and `MB_CHECK_ASSERT()` in `mb_check_buddy()`, and the `ext4_grp_locked_error()` paths panic outright because the crafted image\u0027s `s_errors` field can select `errors=panic`; at minimum the filesystem is forced read-only.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"0983142c5f17a62055ec851372273c3bc77e4788\", \"lessThan\": \"94ebf71bddbcd4ab1ce43ae32c6cb66396d2d51a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6bd97bf273bdb4944904e57480f6545bca48ad77\", \"lessThan\": \"c1317822e2de80e78f137d3a2d99febab1b80326\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6bd97bf273bdb4944904e57480f6545bca48ad77\", \"lessThan\": \"78327acd4cdc4a1601af718b781eece577b6b7d4\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6bd97bf273bdb4944904e57480f6545bca48ad77\", \"lessThan\": \"ea42d6cffb0dd27a417f410b9d0011e9859328cb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6bd97bf273bdb4944904e57480f6545bca48ad77\", \"lessThan\": \"6b0d48647935e4b8c7b75d1eccb9043fcd4ee581\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"6bd97bf273bdb4944904e57480f6545bca48ad77\", \"lessThan\": \"c9b528c35795b711331ed36dc3dbee90d5812d4e\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"5.10.181\", \"lessThan\": \"5.10.211\", \"versionType\": \"semver\"}], \"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\": \"5.11\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.11\", \"versionType\": \"semver\"}, {\"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\": \"6.1.78\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.17\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.7.5\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.7.*\"}, {\"status\": \"unaffected\", \"version\": \"6.8\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"fs/ext4/mballoc.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/94ebf71bddbcd4ab1ce43ae32c6cb66396d2d51a\"}, {\"url\": \"https://git.kernel.org/stable/c/c1317822e2de80e78f137d3a2d99febab1b80326\"}, {\"url\": \"https://git.kernel.org/stable/c/78327acd4cdc4a1601af718b781eece577b6b7d4\"}, {\"url\": \"https://git.kernel.org/stable/c/ea42d6cffb0dd27a417f410b9d0011e9859328cb\"}, {\"url\": \"https://git.kernel.org/stable/c/6b0d48647935e4b8c7b75d1eccb9043fcd4ee581\"}, {\"url\": \"https://git.kernel.org/stable/c/c9b528c35795b711331ed36dc3dbee90d5812d4e\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\next4: regenerate buddy after block freeing failed if under fc replay\\n\\nThis mostly reverts commit 6bd97bf273bd (\\\"ext4: remove redundant\\nmb_regenerate_buddy()\\\") and reintroduces mb_regenerate_buddy(). 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      "cveMetadata": "{\"cveId\": \"CVE-2024-26601\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-08-05T11:26:11.866Z\", \"dateReserved\": \"2024-02-19T14:20:24.128Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2024-02-24T14:56:56.324Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}



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Taxonomy of the tags.





Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.