CVE-2025-38578

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> f2fs: fix to avoid UAF in f2fs_sync_inode_meta()<br /> <br /> syzbot reported an UAF issue as below: [1] [2]<br /> <br /> [1] https://syzkaller.appspot.com/text?tag=CrashReport&amp;x=16594c60580000<br /> <br /> ==================================================================<br /> BUG: KASAN: use-after-free in __list_del_entry_valid+0xa6/0x130 lib/list_debug.c:62<br /> Read of size 8 at addr ffff888100567dc8 by task kworker/u4:0/8<br /> <br /> CPU: 1 PID: 8 Comm: kworker/u4:0 Tainted: G W 6.1.129-syzkaller-00017-g642656a36791 #0<br /> Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 02/12/2025<br /> Workqueue: writeback wb_workfn (flush-7:0)<br /> Call Trace:<br /> <br /> __dump_stack lib/dump_stack.c:88 [inline]<br /> dump_stack_lvl+0x151/0x1b7 lib/dump_stack.c:106<br /> print_address_description mm/kasan/report.c:316 [inline]<br /> print_report+0x158/0x4e0 mm/kasan/report.c:427<br /> kasan_report+0x13c/0x170 mm/kasan/report.c:531<br /> __asan_report_load8_noabort+0x14/0x20 mm/kasan/report_generic.c:351<br /> __list_del_entry_valid+0xa6/0x130 lib/list_debug.c:62<br /> __list_del_entry include/linux/list.h:134 [inline]<br /> list_del_init include/linux/list.h:206 [inline]<br /> f2fs_inode_synced+0x100/0x2e0 fs/f2fs/super.c:1553<br /> f2fs_update_inode+0x72/0x1c40 fs/f2fs/inode.c:588<br /> f2fs_update_inode_page+0x135/0x170 fs/f2fs/inode.c:706<br /> f2fs_write_inode+0x416/0x790 fs/f2fs/inode.c:734<br /> write_inode fs/fs-writeback.c:1460 [inline]<br /> __writeback_single_inode+0x4cf/0xb80 fs/fs-writeback.c:1677<br /> writeback_sb_inodes+0xb32/0x1910 fs/fs-writeback.c:1903<br /> __writeback_inodes_wb+0x118/0x3f0 fs/fs-writeback.c:1974<br /> wb_writeback+0x3da/0xa00 fs/fs-writeback.c:2081<br /> wb_check_background_flush fs/fs-writeback.c:2151 [inline]<br /> wb_do_writeback fs/fs-writeback.c:2239 [inline]<br /> wb_workfn+0xbba/0x1030 fs/fs-writeback.c:2266<br /> process_one_work+0x73d/0xcb0 kernel/workqueue.c:2299<br /> worker_thread+0xa60/0x1260 kernel/workqueue.c:2446<br /> kthread+0x26d/0x300 kernel/kthread.c:386<br /> ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:295<br /> <br /> <br /> Allocated by task 298:<br /> kasan_save_stack mm/kasan/common.c:45 [inline]<br /> kasan_set_track+0x4b/0x70 mm/kasan/common.c:52<br /> kasan_save_alloc_info+0x1f/0x30 mm/kasan/generic.c:505<br /> __kasan_slab_alloc+0x6c/0x80 mm/kasan/common.c:333<br /> kasan_slab_alloc include/linux/kasan.h:202 [inline]<br /> slab_post_alloc_hook+0x53/0x2c0 mm/slab.h:768<br /> slab_alloc_node mm/slub.c:3421 [inline]<br /> slab_alloc mm/slub.c:3431 [inline]<br /> __kmem_cache_alloc_lru mm/slub.c:3438 [inline]<br /> kmem_cache_alloc_lru+0x102/0x270 mm/slub.c:3454<br /> alloc_inode_sb include/linux/fs.h:3255 [inline]<br /> f2fs_alloc_inode+0x2d/0x350 fs/f2fs/super.c:1437<br /> alloc_inode fs/inode.c:261 [inline]<br /> iget_locked+0x18c/0x7e0 fs/inode.c:1373<br /> f2fs_iget+0x55/0x4ca0 fs/f2fs/inode.c:486<br /> f2fs_lookup+0x3c1/0xb50 fs/f2fs/namei.c:484<br /> __lookup_slow+0x2b9/0x3e0 fs/namei.c:1689<br /> lookup_slow+0x5a/0x80 fs/namei.c:1706<br /> walk_component+0x2e7/0x410 fs/namei.c:1997<br /> lookup_last fs/namei.c:2454 [inline]<br /> path_lookupat+0x16d/0x450 fs/namei.c:2478<br /> filename_lookup+0x251/0x600 fs/namei.c:2507<br /> vfs_statx+0x107/0x4b0 fs/stat.c:229<br /> vfs_fstatat fs/stat.c:267 [inline]<br /> vfs_lstat include/linux/fs.h:3434 [inline]<br /> __do_sys_newlstat fs/stat.c:423 [inline]<br /> __se_sys_newlstat+0xda/0x7c0 fs/stat.c:417<br /> __x64_sys_newlstat+0x5b/0x70 fs/stat.c:417<br /> x64_sys_call+0x52/0x9a0 arch/x86/include/generated/asm/syscalls_64.h:7<br /> do_syscall_x64 arch/x86/entry/common.c:51 [inline]<br /> do_syscall_64+0x3b/0x80 arch/x86/entry/common.c:81<br /> entry_SYSCALL_64_after_hwframe+0x68/0xd2<br /> <br /> Freed by task 0:<br /> kasan_save_stack mm/kasan/common.c:45 [inline]<br /> kasan_set_track+0x4b/0x70 mm/kasan/common.c:52<br /> kasan_save_free_info+0x2b/0x40 mm/kasan/generic.c:516<br /> ____kasan_slab_free+0x131/0x180 mm/kasan/common.c:241<br /> __kasan_slab_free+0x11/0x20 mm/kasan/common.c:249<br /> kasan_slab_free include/linux/kasan.h:178 [inline]<br /> slab_free_hook mm/slub.c:1745 [inline]<br /> slab_free_freelist_hook mm/slub.c:1771 [inline]<br /> slab_free mm/slub.c:3686 [inline]<br /> kmem_cache_free+0x<br /> ---truncated---