{ "schema_version": "1.6.1", "id": "RPI-CVE-2024-42296", "modified": "2026-10-09T11:39:44Z", "upstream": [ "CVE-2024-42296" ], "published": "2024-08-17T09:11:20Z", "summary": "f2fs: fix return value of f2fs_convert_inline_inode()", "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix return value of f2fs_convert_inline_inode()\n\nIf device is readonly, make f2fs_convert_inline_inode()\nreturn EROFS instead of zero, otherwise it may trigger\npanic during writeback of inline inode's dirty page as\nbelow:\n\n f2fs_write_single_data_page+0xbb6/0x1e90 fs/f2fs/data.c:2888\n f2fs_write_cache_pages fs/f2fs/data.c:3187 [inline]\n __f2fs_write_data_pages fs/f2fs/data.c:3342 [inline]\n f2fs_write_data_pages+0x1efe/0x3a90 fs/f2fs/data.c:3369\n do_writepages+0x359/0x870 mm/page-writeback.c:2634\n filemap_fdatawrite_wbc+0x125/0x180 mm/filemap.c:397\n __filemap_fdatawrite_range mm/filemap.c:430 [inline]\n file_write_and_wait_range+0x1aa/0x290 mm/filemap.c:788\n f2fs_do_sync_file+0x68a/0x1ae0 fs/f2fs/file.c:276\n generic_write_sync include/linux/fs.h:2806 [inline]\n f2fs_file_write_iter+0x7bd/0x24e0 fs/f2fs/file.c:4977\n call_write_iter include/linux/fs.h:2114 [inline]\n new_sync_write fs/read_write.c:497 [inline]\n vfs_write+0xa72/0xc90 fs/read_write.c:590\n ksys_write+0x1a0/0x2c0 fs/read_write.c:643\n do_syscall_x64 arch/x86/entry/common.c:52 [inline]\n do_syscall_64+0xf5/0x240 arch/x86/entry/common.c:83\n entry_SYSCALL_64_after_hwframe+0x77/0x7f", "severity": [ { "type": "CVSS_V3", "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/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" ], "ecosystem_specific": { "binaries": [ { "binary_name": "linux-image-6.1.0-rpi1-rpi-v6", "binary_version": 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rule)", "upstream_fixed": "6.6.44" }, "1:6.6.31-1+rpt1": { "linux_commit": "c1432b4bae5b6582f4d32ba381459f33c34d1424", "upstream_version": "6.6.31", "assessment": "commit ancestry (strak rule)", "upstream_fixed": "6.6.44" } } } } ], "references": [ { "type": "ADVISORY", "url": "https://www.cve.org/CVERecord?id=CVE-2024-42296" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/70f5ef5f33c333cfb286116fa3af74ac9bc84f1b" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/47a8ddcdcaccd9b891db4574795e46a33a121ac2" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/077f0e24b27c4b44841593c7edbd1993be9eecb5" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/1e7725814361c8c008d131db195cef8274ff26b8" }, { "type": "FIX", "url": "https://git.kernel.org/stable/c/a8eb3de28e7a365690c61161e7a07a4fc7c60bbf" } ], "database_specific": { "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git", "upstream_modified": "2026-08-05T11:52:36Z", "severity": { "source": "kernel CNA", "cvss_v3_score": 7.8, "cvss_v3_severity": "High", "scenario": "AV:L - The bug is reached entirely through local filesystem syscalls \u2014 `write()`/`fsync()` or an `mmap(MAP_SHARED)` store \u2014 against a file on a locally mounted f2fs. No network or physical component is involved in triggering it.\nAC:L - Once the f2fs is in the affected state (backing device read-only while mounted rw \u2014 a real steady state on wear-out eMMC/UFS, write-protected SD/USB media, RO dm tables, or a multi-device f2fs with one RO member), the trigger is deterministic and single-threaded: create a file small enough to stay inline, then mmap-write it or write past `MAX_INLINE_DATA` and fsync. There is no race to win and no memory layout to groom, and the attacker can repeat it at will.\nPR:L - Any unprivileged local user holding a writable fd to a file on the affected f2fs \u2014 their own file in a home directory, /tmp, or /data/local/tmp \u2014 can reach both `f2fs_vm_page_mkwrite()` and the writeback path. No capability, ioctl gate, or mount privilege is required.\nUI:N - No victim action is needed; the attacker performs the write or page fault entirely on their own file. The read-only device condition is a pre-existing system/hardware state, not an interaction solicited from a user.\nS:U - The BUG_ON, the corrupted `i_addr[]`/inline region, and any resulting data access all live inside the kernel and the same f2fs instance. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The resulting inode state (F2FS_INLINE_DATA set with real block addresses in the overlapping `i_addr[]` array) is the same corruption class as CVE-2024-44942; on-disk block addresses become readable as file content, and once the inline flag is cleared via `f2fs_convert_inline_page()`'s `clear_out` path without truncating the region, the user controls their file's block map and can read data blocks belonging to other files on the filesystem.\nI:H - `f2fs_get_block_locked()` stamps block addresses over the inline data area while `f2fs_write_inline_data()`'s `memcpy_from_page()` stamps user-controlled bytes over the block address array, giving mutually corrupting writes to inode metadata; on a multi-device f2fs with one RO member the rest of the volume stays writable, so this inconsistent inode can be committed to disk and later drive GC/truncate down attacker-influenced block addresses.\nA:H - The commit states it \"may trigger panic,\" and the shared syzbot report shows `kernel BUG at fs/f2fs/inline.c:258` in `f2fs_write_inline_data()`; with CONFIG_F2FS_CHECK_FS the `f2fs_bug_on()` at fs/f2fs/file.c:105 and fs/f2fs/inline.c:258 are BUG_ON, and without it the WARN_ON panics under panic_on_warn and otherwise leaves the filesystem flagged NEED_FSCK." } } }