159 lines
13 KiB
JSON
159 lines
13 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2023-53829",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-12-09T01:27:17.825Z",
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"datePublished": "2025-12-09T01:29:43.645Z",
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"dateUpdated": "2026-08-05T09:16:19.040Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T09:16:19.040Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: flush inode if atomic file is aborted\n\nLet's flush the inode being aborted atomic operation to avoid stale dirty\ninode during eviction in this call stack:\n\n f2fs_mark_inode_dirty_sync+0x22/0x40 [f2fs]\n f2fs_abort_atomic_write+0xc4/0xf0 [f2fs]\n f2fs_evict_inode+0x3f/0x690 [f2fs]\n ? sugov_start+0x140/0x140\n evict+0xc3/0x1c0\n evict_inodes+0x17b/0x210\n generic_shutdown_super+0x32/0x120\n kill_block_super+0x21/0x50\n deactivate_locked_super+0x31/0x90\n cleanup_mnt+0x100/0x160\n task_work_run+0x59/0x90\n do_exit+0x33b/0xa50\n do_group_exit+0x2d/0x80\n __x64_sys_exit_group+0x14/0x20\n do_syscall_64+0x3b/0x90\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\n\nThis triggers f2fs_bug_on() in f2fs_evict_inode:\n f2fs_bug_on(sbi, is_inode_flag_set(inode, FI_DIRTY_INODE));\n\nThis fixes the syzbot report:\n\nloop0: detected capacity change from 0 to 131072\nF2FS-fs (loop0): invalid crc value\nF2FS-fs (loop0): Found nat_bits in checkpoint\nF2FS-fs (loop0): Mounted with checkpoint version = 48b305e4\n------------[ cut here ]------------\nkernel BUG at fs/f2fs/inode.c:869!\ninvalid opcode: 0000 [#1] PREEMPT SMP KASAN\nCPU: 0 PID: 5014 Comm: syz-executor220 Not tainted 6.4.0-syzkaller-11479-g6cd06ab12d1a #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 05/27/2023\nRIP: 0010:f2fs_evict_inode+0x172d/0x1e00 fs/f2fs/inode.c:869\nCode: ff df 48 c1 ea 03 80 3c 02 00 0f 85 6a 06 00 00 8b 75 40 ba 01 00 00 00 4c 89 e7 e8 6d ce 06 00 e9 aa fc ff ff e8 63 22 e2 fd <0f> 0b e8 5c 22 e2 fd 48 c7 c0 a8 3a 18 8d 48 ba 00 00 00 00 00 fc\nRSP: 0018:ffffc90003a6fa00 EFLAGS: 00010293\nRAX: 0000000000000000 RBX: 0000000000000001 RCX: 0000000000000000\nRDX: ffff8880273b8000 RSI: ffffffff83a2bd0d RDI: 0000000000000007\nRBP: ffff888077db91b0 R08: 0000000000000007 R09: 0000000000000000\nR10: 0000000000000001 R11: 0000000000000001 R12: ffff888029a3c000\nR13: ffff888077db9660 R14: ffff888029a3c0b8 R15: ffff888077db9c50\nFS: 0000000000000000(0000) GS:ffff8880b9800000(0000) knlGS:0000000000000000\nCS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033\nCR2: 00007f1909bb9000 CR3: 00000000276a9000 CR4: 0000000000350ef0\nCall Trace:\n <TASK>\n evict+0x2ed/0x6b0 fs/inode.c:665\n dispose_list+0x117/0x1e0 fs/inode.c:698\n evict_inodes+0x345/0x440 fs/inode.c:748\n generic_shutdown_super+0xaf/0x480 fs/super.c:478\n kill_block_super+0x64/0xb0 fs/super.c:1417\n kill_f2fs_super+0x2af/0x3c0 fs/f2fs/super.c:4704\n deactivate_locked_super+0x98/0x160 fs/super.c:330\n deactivate_super+0xb1/0xd0 fs/super.c:361\n cleanup_mnt+0x2ae/0x3d0 fs/namespace.c:1254\n task_work_run+0x16f/0x270 kernel/task_work.c:179\n exit_task_work include/linux/task_work.h:38 [inline]\n do_exit+0xa9a/0x29a0 kernel/exit.c:874\n do_group_exit+0xd4/0x2a0 kernel/exit.c:1024\n __do_sys_exit_group kernel/exit.c:1035 [inline]\n __se_sys_exit_group kernel/exit.c:1033 [inline]\n __x64_sys_exit_group+0x3e/0x50 kernel/exit.c:1033\n do_syscall_x64 arch/x86/entry/common.c:50 [inline]\n do_syscall_64+0x39/0xb0 arch/x86/entry/common.c:80\n entry_SYSCALL_64_after_hwframe+0x63/0xcd\nRIP: 0033:0x7f309be71a09\nCode: Unable to access opcode bytes at 0x7f309be719df.\nRSP: 002b:00007fff171df518 EFLAGS: 00000246 ORIG_RAX: 00000000000000e7\nRAX: ffffffffffffffda RBX: 00007f309bef7330 RCX: 00007f309be71a09\nRDX: 000000000000003c RSI: 00000000000000e7 RDI: 0000000000000001\nRBP: 0000000000000001 R08: ffffffffffffffc0 R09: 00007f309bef1e40\nR10: 0000000000010600 R11: 0000000000000246 R12: 00007f309bef7330\nR13: 0000000000000001 R14: 0000000000000000 R15: 0000000000000001\n </TASK>\nModules linked in:\n---[ end trace 0000000000000000 ]---\nRIP: 0010:f2fs_evict_inode+0x172d/0x1e00 fs/f2fs/inode.c:869\nCode: ff df 48 c1 ea 03 80 3c 02 00 0f 85 6a 06 00 00 8b 75 40 ba 01 00 00 00 4c 89 e7 e8 6d ce 06 00 e9 aa fc ff ff e8 63 22 e2 fd <0f> 0b e8 5c 22 e2 fd 48 c7 c0 a8 3a 18 8d 48 ba 00 00 00 00 00 fc\nRSP: 0018:ffffc90003a6fa00 EFLAGS: 00010293\nRAX: 0000000000000000 RBX: 0000000000\n---truncated---"
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"value": "AV:L - The vulnerability is reached through a local ioctl (`F2FS_IOC_START_ATOMIC_WRITE`/`F2FS_IOC_START_ATOMIC_REPLACE`) on a regular file of a mounted f2fs filesystem, with the fault triggered by subsequent local inode eviction. No network or physical access is involved.\nAC:L - The state is set up deterministically by a single ioctl, and the attacker controls the remaining condition — forcing eviction of an nlink>0 inode via inode-cache/memory pressure or umount is routine and attacker-inducible; syzbot produced a C reproducer. No race must be won and no uncontrollable memory layout is required.\nPR:L - `f2fs_ioc_start_atomic_write()` only checks `inode_owner_or_capable()`, so an ordinary unprivileged local user (e.g. any Android app operating on its own files under the f2fs `/data` mount) suffices. No CAP_* capability or root is needed.\nUI:N - The attacker performs every step itself — opening its own file, issuing the ioctl, and driving inode reclaim — with no action by any other user. On Android/embedded systems the f2fs data volume is already mounted, so no victim-initiated mount is required.\nS:U - The corruption and crash are confined to the kernel's own memory and the f2fs superblock's dirty-inode list, within the same security authority. No VM, IOMMU, or sandbox boundary is crossed.\nC:H - The freed `f2fs_inode_info` remains linked in the global `sbi->inode_list[DIRTY_META]`, and `f2fs_sync_inode_meta()` later dereferences it via `list_first_entry()`/`igrab()`/`sync_inode_metadata()`, reading freed slab memory that the attacker can reclaim and groom with f2fs inodes — a use-after-free read primitive on kernel memory.\nI:H - The same use-after-free gives write access to the freed object — `igrab()` writes `i_count`/`i_lock` into it and `f2fs_inode_synced()` performs a `list_del_init()` unlink on attacker-reclaimable memory, yielding a classic pointer-write primitive exploitable for control-flow hijacking; on-disk metadata is additionally left inconsistent (`SBI_NEED_FSCK`).\nA:H - With `CONFIG_F2FS_CHECK_FS` the `f2fs_bug_on()` at fs/f2fs/inode.c:869 is a hard `BUG_ON` causing an immediate kernel panic (the reported syzbot crash), and in default builds the leaked `F2FS_DIRTY_IMETA` count makes `block_operations()` loop forever so every checkpoint/fsync/sync/umount hangs, plus the use-after-free itself crashes the kernel."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/f2fs/segment.c"
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],
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"versions": [
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{
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"version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4",
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"lessThan": "1c64dbe8fa3552a340bca6d7fa09468c16ed2a85",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4",
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"lessThan": "bfa7853bb47fee0c17030b377c98cf4ede47ba33",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "98e4da8ca301e062d79ae168c67e56f3c3de3ce4",
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"lessThan": "a3ab55746612247ce3dcaac6de66f5ffc055b9df",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"fs/f2fs/segment.c"
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],
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"versions": [
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{
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"version": "3.8",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "3.8",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.1.54",
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"lessThanOrEqual": "6.1.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.5.4",
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"lessThanOrEqual": "6.5.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.6",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.8",
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"versionEndExcluding": "6.1.54"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.8",
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"versionEndExcluding": "6.5.4"
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},
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{
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "3.8",
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"versionEndExcluding": "6.6"
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}
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}
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]
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}
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],
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/1c64dbe8fa3552a340bca6d7fa09468c16ed2a85"
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},
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{
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"url": "https://git.kernel.org/stable/c/bfa7853bb47fee0c17030b377c98cf4ede47ba33"
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},
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{
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"url": "https://git.kernel.org/stable/c/a3ab55746612247ce3dcaac6de66f5ffc055b9df"
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}
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],
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"title": "f2fs: flush inode if atomic file is aborted",
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"x_generator": {
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}
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} |