CVE-2022-49880 in Linux
要約
〜によって VulDB • 2026年05月29日
Linuxカーネルにおいて、以下の脆弱性が修正されました。
ext4: 'ext4_da_release_space' 内の警告を修正
Syzkallerによるレポートは以下の通りです。
EXT4-fs (loop0): Free/Dirty block details EXT4-fs (loop0): free_blocks=0 EXT4-fs (loop0): dirty_blocks=0 EXT4-fs (loop0): Block reservation details EXT4-fs (loop0): i_reserved_data_blocks=0 EXT4-fs (loop0): i_reserved_meta_blocks=0 EXT4-fs (loop0): i_reserved_meta_blocks=0 EXT4-fs (loop0): i_reserved_data_blocks=0 EXT4-fs (loop0): Free/Dirty block details EXT4-fs (loop0): free_blocks=0 EXT4-fs (loop0): dirty_blocks=0 EXT4-ff (loop0): Block reservation details EXT4-fs (loop0): i_reserved_data_blocks=0 EXT4-fs (loop0): i_reserved_meta_blocks=0 EXT4-fs (loop0): i_reserved_meta_blocks=0 EXT4-fs (loop0): i_reserved_data_blocks=0 WARNING: CPU: 0 PID: 1000 at fs/ext4/extents_status.c:1461 ext4_es_remove_extent+0x1ab/0x260 fs/ext4/extents_status.c:1461 CPU: 0 PID: 1000 Comm: kworker/u4:1 Not tainted 6.1.0-rc5-syzkaller #0 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.15.0-1 04/01/2014 Workqueue: writeback wb_workfn [kernel]
RIP: 0010:ext4_es_remove_extent+0x1ab/0x260 fs/ext4/extents_status.c:1461 Call Trace: <TASK> mpage_release_unused_pages+0x24d/0xef0 fs/ext4/inode.c:1589 ext4_writepages+0x12eb/0x3be0 fs/ext4/inode.c:2852 do_writepages+0x3c3/0x680 mm/page-writeback.c:2469 __writeback_single_inode+0xd1/0x670 fs/fs-writeback.c:1587 writeback_sb_inodes+0xb3b/0x18f0 fs/fs-writeback.c:1870 wb_writeback+0x41f/0x7b0 fs/fs-writeback.c:2044 wb_do_writeback fs/fs-writeback.c:2187 [inline]
wb_workfn+0x3cb/0xef0 fs/fs-writeback.c:2227 process_one_work+0x877/0xdb0 kernel/workqueue.c:2289 worker_thread+0xb14/0x1330 kernel/workqueue.c:2436 kthread+0x266/0x300 kernel/kthread.c:376 ret_from_fork+0x1f/0x30 arch/x86/entry/entry_64.S:306 </TASK>
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