CVSS 5.5 · Medium EPSS 0,23%
Kerentanan pada linux kernel. Skor CVSS 3.1 5.5 (Medium) menurut CISA ADP.
In the Linux kernel, the following vulnerability has been resolved: ext4: fix mb_cache_entry's e_refcnt leak in ext4_xattr_block_cache_find() Syzbot reports a warning as follows: ============================================ WARNING: CPU: 0 PID: 5075 at fs/mbcache.c:419 mb_cache_destroy+0x224/0x290 Modules linked in: CPU: 0 PID: 5075 Comm: syz-executor199 Not tainted 6.9.0-rc6-gb947cc5bf6d7 RIP: 0010:mb_cache_destroy+0x224/0x290 fs/mbcache.c:419 Call Trace: <TASK> ext4_put_super+0x6d4/0xcd0 fs/ext4/super.c:1375 generic_shutdown_super+0x136/0x2d0 fs/super.c:641 kill_block_super+0x44/0x90 fs/super.c:1675 ext4_kill_sb+0x68/0xa0 fs/ext4/super.c:7327 [...] ============================================ This is because when finding an entry in ext4_xattr_block_cache_find(), if ext4_sb_bread() returns -ENOMEM, the ce's e_refcnt, which has already grown in the __entry_find(), won't be put away, and eventually trigger the above issue in mb_cache_destroy() due to reference count leakage. So call mb_cache_entry_put() on the -ENOMEM error branch as a quick fix.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N
· uraikan di kalkulator | Vendor | Produk | Versi terdampak |
|---|---|---|
| linux | linux kernel | Versi 4.14.92 hingga sebelum 4.15 |
| linux | linux kernel | Versi 4.19.14 hingga sebelum 4.19.316 |
| linux | linux kernel | Versi 4.20.1 hingga 5.4.278 |
| linux | linux kernel | Versi 5.5 hingga 5.15.161 |
| linux | linux kernel | Versi 5.16 hingga 6.1.94 |
| linux | linux kernel | Versi 6.2 hingga 6.6.34 |
| linux | linux kernel | Versi 6.7 hingga 6.9.5 |