{"id":"DEBIAN-CVE-2022-49708","details":"In the Linux kernel, the following vulnerability has been resolved:  ext4: fix bug_on ext4_mb_use_inode_pa  Hulk Robot reported a BUG_ON: ================================================================== kernel BUG at fs/ext4/mballoc.c:3211! [...] RIP: 0010:ext4_mb_mark_diskspace_used.cold+0x85/0x136f [...] Call Trace:  ext4_mb_new_blocks+0x9df/0x5d30  ext4_ext_map_blocks+0x1803/0x4d80  ext4_map_blocks+0x3a4/0x1a10  ext4_writepages+0x126d/0x2c30  do_writepages+0x7f/0x1b0  __filemap_fdatawrite_range+0x285/0x3b0  file_write_and_wait_range+0xb1/0x140  ext4_sync_file+0x1aa/0xca0  vfs_fsync_range+0xfb/0x260  do_fsync+0x48/0xa0 [...] ==================================================================  Above issue may happen as follows: ------------------------------------- do_fsync  vfs_fsync_range   ext4_sync_file    file_write_and_wait_range     __filemap_fdatawrite_range      do_writepages       ext4_writepages        mpage_map_and_submit_extent         mpage_map_one_extent          ext4_map_blocks           ext4_mb_new_blocks            ext4_mb_normalize_request             \u003e\u003e\u003e start + size \u003c= ac-\u003eac_o_ex.fe_logical            ext4_mb_regular_allocator             ext4_mb_simple_scan_group              ext4_mb_use_best_found               ext4_mb_new_preallocation                ext4_mb_new_inode_pa                 ext4_mb_use_inode_pa                  \u003e\u003e\u003e set ac-\u003eac_b_ex.fe_len \u003c= 0            ext4_mb_mark_diskspace_used             \u003e\u003e\u003e BUG_ON(ac-\u003eac_b_ex.fe_len \u003c= 0);  we can easily reproduce this problem with the following commands: \t`fallocate -l100M disk` \t`mkfs.ext4 -b 1024 -g 256 disk` \t`mount disk /mnt` \t`fsstress -d /mnt -l 0 -n 1000 -p 1`  The size must be smaller than or equal to EXT4_BLOCKS_PER_GROUP. Therefore, \"start + size \u003c= ac-\u003eac_o_ex.fe_logical\" may occur when the size is truncated. So start should be the start position of the group where ac_o_ex.fe_logical is located after alignment. In addition, when the value of fe_logical or EXT4_BLOCKS_PER_GROUP is very large, the value calculated by start_off is more accurate.","modified":"2026-09-01T16:05:20.382456123Z","published":"2025-02-26T07:01:46.607Z","upstream":["CVE-2022-49708"],"references":[{"type":"ADVISORY","url":"https://security-tracker.debian.org/tracker/CVE-2022-49708"}],"affected":[{"package":{"name":"linux","ecosystem":"Debian:12","purl":"pkg:deb/debian/linux?arch=source&distro=bookworm"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.18.14-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49708.json"}},{"package":{"name":"linux","ecosystem":"Debian:13","purl":"pkg:deb/debian/linux?arch=source&distro=trixie"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.18.14-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49708.json"}},{"package":{"name":"linux","ecosystem":"Debian:14","purl":"pkg:deb/debian/linux?arch=source&distro=forky"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"0"},{"fixed":"5.18.14-1"}]}],"ecosystem_specific":{"urgency":"not yet assigned"},"database_specific":{"source":"https://storage.googleapis.com/osv-test-debian-osv/debian-cve-osv/DEBIAN-CVE-2022-49708.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"}]}