CVSS 7.8 · High EPSS 0,12%
Kerentanan Use After Free pada linux kernel. Skor CVSS 3.1 7.8 (High) menurut NVD.
In the Linux kernel, the following vulnerability has been resolved: f2fs: fix to avoid UAF in f2fs_write_end_io() As syzbot reported an use-after-free issue in f2fs_write_end_io(). It is caused by below race condition: loop device umount - worker_thread - loop_process_work - do_req_filebacked - lo_rw_aio - lo_rw_aio_complete - blk_mq_end_request - blk_update_request - f2fs_write_end_io - dec_page_count - folio_end_writeback - kill_f2fs_super - kill_block_super - f2fs_put_super : free(sbi) : get_pages(, F2FS_WB_CP_DATA) accessed sbi which is freed In kill_f2fs_super(), we will drop all page caches of f2fs inodes before call free(sbi), it guarantee that all folios should end its writeback, so it should be safe to access sbi before last folio_end_writeback(). Let's relocate ckpt thread wakeup flow before folio_end_writeback() to resolve this issue.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
· uraikan di kalkulator | Vendor | Produk | Versi terdampak |
|---|---|---|
| linux | linux kernel | Versi 3.13 hingga sebelum 5.10.251 |
| linux | linux kernel | Versi 5.11 hingga sebelum 5.15.201 |
| linux | linux kernel | Versi 5.16 hingga sebelum 6.1.164 |
| linux | linux kernel | Versi 6.2 hingga sebelum 6.6.127 |
| linux | linux kernel | Versi 6.7 hingga sebelum 6.12.74 |
| linux | linux kernel | Versi 6.13 hingga sebelum 6.18.13 |
| linux | linux kernel | Versi 6.19 hingga sebelum 6.19.3 |