{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-47740", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-47740" ], "published": "2024-10-21T12:16:24Z", "summary": "f2fs: Require FMODE_WRITE for atomic write ioctls", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: Require FMODE_WRITE for atomic write ioctls\n\nThe F2FS ioctls for starting and committing atomic writes check for\ninode_owner_or_capable(), but this does not give LSMs like SELinux or\nLandlock an opportunity to deny the write access - if the caller's FSUID\nmatches the inode's UID, inode_owner_or_capable() immediately returns true.\n\nThere are scenarios where LSMs want to deny a process the ability to write\nparticular files, even files that the FSUID of the process owns; but this\ncan currently partially be bypassed using atomic write ioctls in two ways:\n\n - F2FS_IOC_START_ATOMIC_REPLACE + F2FS_IOC_COMMIT_ATOMIC_WRITE can\n truncate an inode to size 0\n - F2FS_IOC_START_ATOMIC_WRITE + F2FS_IOC_ABORT_ATOMIC_WRITE can revert\n changes another process concurrently made to a file\n\nFix it by requiring FMODE_WRITE for these operations, just like for\nF2FS_IOC_MOVE_RANGE. Since any legitimate caller should only be using these\nioctls when intending to write into the file, that seems unlikely to break\nanything.", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H" } ], "affected": [ { "package": { "ecosystem": "Raspberry Pi OS:12", "name": "linux" }, "versions": [ "1:6.1.21-1+rpt1", "1:6.1.47-1+rpt2", "1:6.1.47-1+rpt4", "1:6.1.54-1+rpt2", "1:6.1.58-1+rpt2", "1:6.1.63-1+rpt1", "1:6.1.73-1+rpt1", "1:6.6.20-1+rpt1", "1:6.6.28-1+rpt1", "1:6.6.31-1+rpt1", "1:6.6.47-1+rpt1", "1:6.6.51-1+rpt1", "1:6.6.51-1+rpt2", "1:6.6.51-1+rpt3" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.1.0-rpi1-rpi-v6", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v7l", "binary_version": "1:6.1.21-1+rpt1" }, { "binary_name": "linux-image-6.1.0-rpi1-rpi-v8", "binary_version": "1:6.1.21-1+rpt1" }, 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There is no network-reachable path to fs/f2fs/file.c ioctl handlers.\nAC:L - The destructive primitive is two deterministic ioctl calls on an fd the attacker already holds \u2014 no race, no memory-layout dependency, no timing sensitivity. Even the rollback variant is attacker-timed: it chooses when to START and when to ABORT, and any concurrent writes landing in that window are discarded, so a wider window simply catches more.\nPR:L - Only local unprivileged code execution plus an O_RDONLY fd on a file whose UID matches the attacker's FSUID is needed; inode_owner_or_capable() short-circuits on the UID match, so no capability, user namespace, or root is required. mnt_want_write_file() checks only that the mount is writable, not the fd.\nUI:N - START_ATOMIC_REPLACE + COMMIT_ATOMIC_WRITE truncates the file to zero entirely under attacker control, with no victim action required. The attacker opens the file itself and needs nothing from any other process.\nS:U - The vulnerable f2fs ioctl handler and the impacted files are both governed by the kernel's security authority; bypassing an in-kernel LSM check is not a crossing into a different authority. No hypervisor, IOMMU, or VM boundary is traversed.\nC:N - The bug is purely a missing write-side access-control check \u2014 the attacker already holds read access to the target file, so nothing new is disclosed. No kernel memory is leaked and no read primitive is created.\nI:H - The attacker gains write-equivalent power over files the security policy explicitly protected from modification: complete irreversible truncation to size 0, and silent rollback of another process's already-acknowledged writes. For a Landlock- or SELinux-confined process the protected file set is exactly what falls, and every byte of it can be destroyed \u2014 a total loss of integrity for the affected resources.\nA:H - Truncating a target such as a system database, keystore, or configuration file to zero permanently destroys the resource and renders the depending service unavailable. Independently, the attacker can pin the inode in atomic-write state for as long as it chooses, causing all O_DIRECT reads/writes from legitimate processes to fail -EOPNOTSUPP and fallocate/MOVE_RANGE/SET_PIN_FILE/defrag to fail -EINVAL \u2014 a sustained, attacker-controlled denial of service." } } }