# CVE-2024-47740: linux: In the Linux kernel, the following vulnerability has been resolved: f2fs: Require FMODE_WRITE for atomic write ioctl... CVE-2024-47740 is fixed in 19 products on 1 platform, first by DEBIAN-CVE-2024-47740, released October 21, 2024. It is not reported as exploited. Patch Radar priority: Routine. - Web page: https://patchblox.com/security/cve/CVE-2024-47740 - Priority: Routine - CVSS: 5.5 (medium) - EPSS: 0.0023 - CISA KEV: not listed - Exploited (vendor report): no - Publicly disclosed: no - Published: Oct 21, 2024 ## Description 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. ## Where it's fixed | Platform | Product | Fixed in | Fix | Released | |---|---|---|---|---| | Linux | bpftool ol 8 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | bpftool ol 9 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek ol 8 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek ol 8 | 0:5.4.17-2136.338.4.1.el8uek | [ELSA-2024-12884](https://patchblox.com/security/data/fix/linux/elsa-2024-12884.md) | Dec 16, 2024 | | Linux | kernel-uek ol 9 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-container ol 8 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-container ol 8 | 0:5.4.17-2136.338.4.1.el8uek | [ELSA-2024-12884](https://patchblox.com/security/data/fix/linux/elsa-2024-12884.md) | Dec 16, 2024 | | Linux | kernel-uek-container ol 9 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-container-debug ol 8 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-container-debug ol 8 | 0:5.4.17-2136.338.4.1.el8uek | [ELSA-2024-12884](https://patchblox.com/security/data/fix/linux/elsa-2024-12884.md) | Dec 16, 2024 | | Linux | kernel-uek-container-debug ol 9 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-core ol 8 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-core ol 9 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-debug ol 8 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-debug ol 8 | 0:5.4.17-2136.338.4.1.el8uek | [ELSA-2024-12884](https://patchblox.com/security/data/fix/linux/elsa-2024-12884.md) | Dec 16, 2024 | | Linux | kernel-uek-debug ol 9 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-debug-core ol 8 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-debug-core ol 9 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-debug-devel ol 8 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-debug-devel ol 8 | 0:5.4.17-2136.338.4.1.el8uek | [ELSA-2024-12884](https://patchblox.com/security/data/fix/linux/elsa-2024-12884.md) | Dec 16, 2024 | | Linux | kernel-uek-debug-devel ol 9 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-debug-modules ol 8 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-debug-modules ol 9 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-debug-modules-extra ol 8 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-debug-modules-extra ol 9 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-devel ol 8 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-devel ol 8 | 0:5.4.17-2136.338.4.1.el8uek | [ELSA-2024-12884](https://patchblox.com/security/data/fix/linux/elsa-2024-12884.md) | Dec 16, 2024 | | Linux | kernel-uek-devel ol 9 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-doc ol 8 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-doc ol 8 | 0:5.4.17-2136.338.4.1.el8uek | [ELSA-2024-12884](https://patchblox.com/security/data/fix/linux/elsa-2024-12884.md) | Dec 16, 2024 | | Linux | kernel-uek-doc ol 9 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-modules ol 8 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-modules ol 9 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-modules-extra ol 8 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-modules-extra ol 9 | 0:5.15.0-303.171.5.2.el9uek | [ELSA-2024-12887](https://patchblox.com/security/data/fix/linux/elsa-2024-12887.md) | Dec 18, 2024 | | Linux | kernel-uek-tools ol 8 | 0:5.4.17-2136.338.4.1.el7uek | [ELSA-2024-12884](https://patchblox.com/security/data/fix/linux/elsa-2024-12884.md) | Dec 16, 2024 | | Linux | kernel-uek-tools-libs ol 8 | 0:5.4.17-2136.338.4.1.el7uek | [ELSA-2024-12884](https://patchblox.com/security/data/fix/linux/elsa-2024-12884.md) | Dec 16, 2024 | | Linux | linux Debian 12.15 (bookworm) | 6.1.115-1 | [DEBIAN-CVE-2024-47740](https://patchblox.com/security/data/fix/linux/debian-cve-2024-47740.md) | Oct 21, 2024 | | Linux | linux Debian 13.5 (trixie) | 6.11.2-1 | [DEBIAN-CVE-2024-47740](https://patchblox.com/security/data/fix/linux/debian-cve-2024-47740.md) | Oct 21, 2024 | | Linux | linux Debian 14 | 6.11.2-1 | [DEBIAN-CVE-2024-47740](https://patchblox.com/security/data/fix/linux/debian-cve-2024-47740.md) | Oct 21, 2024 | | Linux | perf ol 8 | 0:5.4.17-2136.338.4.1.el7uek | [ELSA-2024-12884](https://patchblox.com/security/data/fix/linux/elsa-2024-12884.md) | Dec 16, 2024 | | Linux | python-perf ol 8 | 0:5.4.17-2136.338.4.1.el7uek | [ELSA-2024-12884](https://patchblox.com/security/data/fix/linux/elsa-2024-12884.md) | Dec 16, 2024 | --- Data as of 2026-11-08T00:53:09Z UTC. 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