{"id":"DEBIAN-CVE-2022-49347","details":"In the Linux kernel, the following vulnerability has been resolved:  ext4: fix bug_on in ext4_writepages  we got issue as follows: EXT4-fs error (device loop0): ext4_mb_generate_buddy:1141: group 0, block bitmap and bg descriptor inconsistent: 25 vs 31513 free cls ------------[ cut here ]------------ kernel BUG at fs/ext4/inode.c:2708! invalid opcode: 0000 [#1] PREEMPT SMP KASAN PTI CPU: 2 PID: 2147 Comm: rep Not tainted 5.18.0-rc2-next-20220413+ #155 RIP: 0010:ext4_writepages+0x1977/0x1c10 RSP: 0018:ffff88811d3e7880 EFLAGS: 00010246 RAX: 0000000000000000 RBX: 0000000000000001 RCX: ffff88811c098000 RDX: 0000000000000000 RSI: ffff88811c098000 RDI: 0000000000000002 RBP: ffff888128140f50 R08: ffffffffb1ff6387 R09: 0000000000000000 R10: 0000000000000007 R11: ffffed10250281ea R12: 0000000000000001 R13: 00000000000000a4 R14: ffff88811d3e7bb8 R15: ffff888128141028 FS:  00007f443aed9740(0000) GS:ffff8883aef00000(0000) knlGS:0000000000000000 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020007200 CR3: 000000011c2a4000 CR4: 00000000000006e0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace:  \u003cTASK\u003e  do_writepages+0x130/0x3a0  filemap_fdatawrite_wbc+0x83/0xa0  filemap_flush+0xab/0xe0  ext4_alloc_da_blocks+0x51/0x120  __ext4_ioctl+0x1534/0x3210  __x64_sys_ioctl+0x12c/0x170  do_syscall_64+0x3b/0x90  It may happen as follows: 1. write inline_data inode vfs_write   new_sync_write     ext4_file_write_iter       ext4_buffered_write_iter         generic_perform_write           ext4_da_write_begin             ext4_da_write_inline_data_begin -\u003e If inline data size too             small will allocate block to write, then mapping will has             dirty page                 ext4_da_convert_inline_data_to_extent -\u003eclear EXT4_STATE_MAY_INLINE_DATA 2. fallocate do_vfs_ioctl   ioctl_preallocate     vfs_fallocate       ext4_fallocate         ext4_convert_inline_data           ext4_convert_inline_data_nolock             ext4_map_blocks -\u003e fail will goto restore data             ext4_restore_inline_data               ext4_create_inline_data               ext4_write_inline_data               ext4_set_inode_state -\u003e set inode EXT4_STATE_MAY_INLINE_DATA 3. writepages __ext4_ioctl   ext4_alloc_da_blocks     filemap_flush       filemap_fdatawrite_wbc         do_writepages           ext4_writepages             if (ext4_has_inline_data(inode))               BUG_ON(ext4_test_inode_state(inode, EXT4_STATE_MAY_INLINE_DATA))  The root cause of this issue is we destory inline data until call ext4_writepages under delay allocation mode.  But there maybe already convert from inline to extent.  To solve this issue, we call filemap_flush first..","modified":"2026-09-01T16:05:31.006132964Z","published":"2025-02-26T07:01:11.433Z","upstream":["CVE-2022-49347"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-49347"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.18.5-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49347.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.18.5-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49347.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.18.5-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49347.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H"}]}