HighFix available

f2fs: Require FMODE_WRITE for atomic write ioctls

Type: advisorySources: OSV

In the Linux kernel, the following vulnerability has been resolved: f2fs: Require FMODE_WRITE for atomic write ioctls The F2FS ioctls for starting and committing atomic writes check for inode_owner_or_capable(), but this does not give LSMs like SELinux or Landlock an opportunity to deny the write access - if the caller's FSUID matches the inode's UID, inode_owner_or_capable() immediately returns true. There are scenarios where LSMs want to deny a process the ability to write particular files, even files that the FSUID of the process owns; but this can currently partially be bypassed using atomic write ioctls in two ways: - F2FS_IOC_START_ATOMIC_REPLACE + F2FS_IOC_COMMIT_ATOMIC_WRITE can truncate an inode to size 0 - F2FS_IOC_START_ATOMIC_WRITE + F2FS_IOC_ABORT_ATOMIC_WRITE can revert changes another process concurrently made to a file Fix it by requiring FMODE_WRITE for these operations, just like for F2FS_IOC_MOVE_RANGE. Since any legitimate caller should only be using these ioctls when intending to write into the file, that seems unlikely to break anything.

Products: Kernel
Affected versions: Not specified
Fixed versions: 4.19.323, 5.10.227, 5.15.168, 5.4.285, 6.1.113, 6.10.13, 6.11.2, 6.6.54
CVEs: CVE-2024-47740
Confirmed fixed CVEs: Not specified
Updated in this feed: 2 Nov 2026, 17:04 UTC · Revision 1

Source evidence

f2fs: Require FMODE_WRITE for atomic write ioctls

core-osv · Original source

Published 21 Oct 2024, 12:14 UTC

osv:CVE-2024-47740

Kernel

Fixed versions: 4.19.323, 5.4.285, 5.10.227, 5.15.168, 6.1.113, 6.6.54, 6.10.13, 6.11.2

Complete source record

{
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  "url": "https://osv.dev/vulnerability/CVE-2024-47740",
  "method": "structured",
  "payload": {
    "kind": "advisory",
    "title": "f2fs: Require FMODE_WRITE for atomic write ioctls",
    "summary": "In the Linux kernel, the following vulnerability has been resolved: f2fs: Require FMODE_WRITE for atomic write ioctls The F2FS ioctls for starting and committing atomic writes check for inode_owner_or_capable(), but this does not give LSMs like SELinux or Landlock an opportunity to deny the write access - if the caller's FSUID matches the inode's UID, inode_owner_or_capable() immediately returns true. There are scenarios where LSMs want to deny a process the ability to write particular files, even files that the FSUID of the process owns; but this can currently partially be bypassed using atomic write ioctls in two ways: - F2FS_IOC_START_ATOMIC_REPLACE + F2FS_IOC_COMMIT_ATOMIC_WRITE can truncate an inode to size 0 - F2FS_IOC_START_ATOMIC_WRITE + F2FS_IOC_ABORT_ATOMIC_WRITE can revert changes another process concurrently made to a file Fix it by requiring FMODE_WRITE for these operations, just like for F2FS_IOC_MOVE_RANGE. Since any legitimate caller should only be using these ioctls when intending to write into the file, that seems unlikely to break anything.",
    "evidence": "osv:CVE-2024-47740",
    "products": [
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      "modified": "2026-10-28T02:30:21.401187040Z",
      "provider": "osv",
      "references": [
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        "https://git.kernel.org/stable/c/f3bfac2cabf5333506b263bc0c8497c95302f32d",
        "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html",
        "https://lists.debian.org/debian-lts-announce/2025/03/msg00002.html",
        "https://github.com/CVEProject/cvelistV5/tree/main/cves/2024/47xxx/CVE-2024-47740.json",
        "https://nvd.nist.gov/vuln/detail/CVE-2024-47740",
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  "source_id": "core-osv",
  "document_id": 487481,
  "published_at": "2024-10-21T12:14:09.171+00:00"
}