{
  "schema_version": "1.6.1",
  "id": "RPI-CVE-2025-38578",
  "modified": "2026-10-09T11:39:44Z",
  "upstream": [
    "CVE-2025-38578"
  ],
  "published": "2025-08-19T17:19:12Z",
  "summary": "f2fs: fix to avoid UAF in f2fs_sync_inode_meta()",
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nf2fs: fix to avoid UAF in f2fs_sync_inode_meta()\n\nsyzbot reported an UAF issue as below: [1] [2]\n\n[1] https://syzkaller.appspot.com/text?tag=CrashReport&x=16594c60580000\n\n==================================================================\nBUG: KASAN: use-after-free in __list_del_entry_valid+0xa6/0x130 lib/list_debug.c:62\nRead of size 8 at addr ffff888100567dc8 by task kworker/u4:0/8\n\nCPU: 1 PID: 8 Comm: kworker/u4:0 Tainted: G        W          6.1.129-syzkaller-00017-g642656a36791 #0\nHardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025\nWorkqueue: writeback wb_workfn (flush-7:0)\nCall Trace:\n <TASK>\n __dump_stack lib/dump_stack.c:88 [inline]\n dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106\n print_address_description mm/kasan/report.c:316 [inline]\n print_report+0x158/0x4e0 mm/kasan/report.c:427\n kasan_report+0x13c/0x170 mm/kasan/report.c:531\n __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:351\n __list_del_entry_valid+0xa6/0x130 lib/list_debug.c:62\n __list_del_entry include/linux/list.h:134 [inline]\n list_del_init include/linux/list.h:206 [inline]\n f2fs_inode_synced+0x100/0x2e0 fs/f2fs/super.c:1553\n f2fs_update_inode+0x72/0x1c40 fs/f2fs/inode.c:588\n f2fs_update_inode_page+0x135/0x170 fs/f2fs/inode.c:706\n f2fs_write_inode+0x416/0x790 fs/f2fs/inode.c:734\n write_inode fs/fs-writeback.c:1460 [inline]\n __writeback_single_inode+0x4cf/0xb80 fs/fs-writeback.c:1677\n writeback_sb_inodes+0xb32/0x1910 fs/fs-writeback.c:1903\n __writeback_inodes_wb+0x118/0x3f0 fs/fs-writeback.c:1974\n wb_writeback+0x3da/0xa00 fs/fs-writeback.c:2081\n wb_check_background_flush fs/fs-writeback.c:2151 [inline]\n wb_do_writeback fs/fs-writeback.c:2239 [inline]\n wb_workfn+0xbba/0x1030 fs/fs-writeback.c:2266\n process_one_work+0x73d/0xcb0 kernel/workqueue.c:2299\n worker_thread+0xa60/0x1260 kernel/workqueue.c:2446\n kthread+0x26d/0x300 kernel/kthread.c:386\n ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295\n </TASK>\n\nAllocated by task 298:\n kasan_save_stack mm/kasan/common.c:45 [inline]\n kasan_set_track+0x4b/0x70 mm/kasan/common.c:52\n kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505\n __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:333\n kasan_slab_alloc include/linux/kasan.h:202 [inline]\n slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:768\n slab_alloc_node mm/slub.c:3421 [inline]\n slab_alloc mm/slub.c:3431 [inline]\n __kmem_cache_alloc_lru mm/slub.c:3438 [inline]\n kmem_cache_alloc_lru+0x102/0x270 mm/slub.c:3454\n alloc_inode_sb include/linux/fs.h:3255 [inline]\n f2fs_alloc_inode+0x2d/0x350 fs/f2fs/super.c:1437\n alloc_inode fs/inode.c:261 [inline]\n iget_locked+0x18c/0x7e0 fs/inode.c:1373\n f2fs_iget+0x55/0x4ca0 fs/f2fs/inode.c:486\n f2fs_lookup+0x3c1/0xb50 fs/f2fs/namei.c:484\n __lookup_slow+0x2b9/0x3e0 fs/namei.c:1689\n lookup_slow+0x5a/0x80 fs/namei.c:1706\n walk_component+0x2e7/0x410 fs/namei.c:1997\n lookup_last fs/namei.c:2454 [inline]\n path_lookupat+0x16d/0x450 fs/namei.c:2478\n filename_lookup+0x251/0x600 fs/namei.c:2507\n vfs_statx+0x107/0x4b0 fs/stat.c:229\n vfs_fstatat fs/stat.c:267 [inline]\n vfs_lstat include/linux/fs.h:3434 [inline]\n __do_sys_newlstat fs/stat.c:423 [inline]\n __se_sys_newlstat+0xda/0x7c0 fs/stat.c:417\n __x64_sys_newlstat+0x5b/0x70 fs/stat.c:417\n x64_sys_call+0x52/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:7\n do_syscall_x64 arch/x86/entry/common.c:51 [inline]\n do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:81\n entry_SYSCALL_64_after_hwframe+0x68/0xd2\n\nFreed by task 0:\n kasan_save_stack mm/kasan/common.c:45 [inline]\n kasan_set_track+0x4b/0x70 mm/kasan/common.c:52\n kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516\n ____kasan_slab_free+0x131/0x180 mm/kasan/common.c:241\n __kasan_slab_free+0x11/0x20 mm/kasan/common.c:249\n kasan_slab_free include/linux/kasan.h:178 [inline]\n slab_free_hook mm/slub.c:1745 [inline]\n slab_free_freelist_hook mm/slub.c:1771 [inline]\n slab_free mm/slub.c:3686 [inline]\n kmem_cache_free+0x\n---truncated---",
  "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": [
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    {
      "type": "ADVISORY",
      "url": "https://www.cve.org/CVERecord?id=CVE-2025-38578"
    },
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    "source": "https://git.kernel.org/pub/scm/linux/security/vulns.git",
    "upstream_modified": "2026-08-05T12:19:11Z",
    "severity": {
      "source": "kernel CNA",
      "cvss_v3_score": 7.8,
      "cvss_v3_severity": "High",
      "scenario": "AV:L - The vulnerability is reached entirely through local filesystem syscalls (unlink/rename/stat, then sync or background writeback) on a mounted f2fs volume; no network or remote protocol data is involved.\nAC:L - Once the crafted image is mounted the dangling `gdirty_list` entry is produced deterministically by the attacker's own unlink/evict sequence, and the attacker forces the use side at will via sync(2)/fsync-driven checkpoint or ordinary background writeback \u2014 no race or memory layout the attacker cannot control, and syzbot reproduces it with a C reproducer.\nPR:L - No capability check exists on the path from the unlink/stat/sync syscalls to `f2fs_evict_inode()` and `f2fs_sync_inode_meta()`; any unprivileged user with access to the f2fs volume (Android /data and SD-card/adoptable storage, udisks2/vold auto-mounted removable media) triggers both the free and the subsequent use.\nUI:N - After the malicious f2fs image is present \u2014 commonly auto-mounted by vold/udisks2 without any human action \u2014 the attacker performs every step alone with ordinary file operations, and the UAF is additionally fired by the kernel's own writeback kworker with no victim involvement.\nS:U - The use-after-free corrupts kernel slab memory within the same kernel security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - `f2fs_sync_inode_meta()` dereferences the freed 1360-byte `f2fs_inode_cache` object as a live inode (`igrab`, `sync_inode_metadata`, `f2fs_update_inode_page`), so a reallocated attacker-groomed object leaks arbitrary kernel memory contents into on-disk inode metadata and into the list pointers read by `__list_del_entry_valid`, giving a groomable arbitrary-read primitive.\nI:H - `list_del_init()` on the stale entry writes kernel pointers into the freed (reallocatable) object, and `sync_inode_metadata()` performs an indirect call through `inode->i_sb->s_op->write_inode` read from freed memory, plus `iput()` can double-free \u2014 a classic UAF write/control-flow-hijack primitive since the attacker can spray the f2fs inode slab at will by creating files.\nA:H - The reported consequence is a KASAN-detected use-after-free with list corruption in the writeback kworker, and with CONFIG_F2FS_CHECK_FS the `f2fs_bug_on` is a hard BUG_ON; either way the machine oopses/panics and the condition is repeatedly triggerable."
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}