CVSS 7.8 · High EPSS 0,15%
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: nilfs2: fix potential UAF of struct nilfs_sc_info in nilfs_segctor_thread() The finalization of nilfs_segctor_thread() can race with nilfs_segctor_kill_thread() which terminates that thread, potentially causing a use-after-free BUG as KASAN detected. At the end of nilfs_segctor_thread(), it assigns NULL to "sc_task" member of "struct nilfs_sc_info" to indicate the thread has finished, and then notifies nilfs_segctor_kill_thread() of this using waitqueue "sc_wait_task" on the struct nilfs_sc_info. However, here, immediately after the NULL assignment to "sc_task", it is possible that nilfs_segctor_kill_thread() will detect it and return to continue the deallocation, freeing the nilfs_sc_info structure before the thread does the notification. This fixes the issue by protecting the NULL assignment to "sc_task" and its notification, with spinlock "sc_state_lock" of the struct nilfs_sc_info. Since nilfs_segctor_kill_thread() does a final check to see if "sc_task" is NULL with "sc_state_lock" locked, this can eliminate the race.
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 2.6.30 hingga sebelum 4.14.313 |
| linux | linux kernel | Versi 4.15 hingga sebelum 4.19.281 |
| linux | linux kernel | Versi 4.20 hingga sebelum 5.4.241 |
| linux | linux kernel | Versi 5.5 hingga sebelum 5.10.178 |
| linux | linux kernel | Versi 5.11 hingga sebelum 5.15.107 |
| linux | linux kernel | Versi 5.16 hingga sebelum 6.1.24 |
| linux | linux kernel | Versi 6.2 hingga sebelum 6.2.11 |
| linux | linux kernel | Versi 6.3 rc1 |
| linux | linux kernel | Versi 6.3 rc2 |
| linux | linux kernel | Versi 6.3 rc3 |
| linux | linux kernel | Versi 6.3 rc4 |
| linux | linux kernel | Versi 6.3 rc5 |