CVSS 5.5 · Medium EPSS 0,24%
Kerentanan pada linux kernel. Skor CVSS 3.1 5.5 (Medium) menurut NVD.
In the Linux kernel, the following vulnerability has been resolved: dm thin: make get_first_thin use rcu-safe list first function The documentation in rculist.h explains the absence of list_empty_rcu() and cautions programmers against relying on a list_empty() -> list_first() sequence in RCU safe code. This is because each of these functions performs its own READ_ONCE() of the list head. This can lead to a situation where the list_empty() sees a valid list entry, but the subsequent list_first() sees a different view of list head state after a modification. In the case of dm-thin, this author had a production box crash from a GP fault in the process_deferred_bios path. This function saw a valid list head in get_first_thin() but when it subsequently dereferenced that and turned it into a thin_c, it got the inside of the struct pool, since the list was now empty and referring to itself. The kernel on which this occurred printed both a warning about a refcount_t being saturated, and a UBSAN error for an out-of-bounds cpuid access in the queued spinlock, prior to the fault itself. When the resulting kdump was examined, it was possible to see another thread patiently waiting in thin_dtr's synchronize_rcu. The thin_dtr call managed to pull the thin_c out of the active thins list (and have it be the last entry in the active_thins list) at just the wrong moment which lead to this crash. Fortunately, the fix here is straight forward. Switch get_first_thin() function to use list_first_or_null_rcu() which performs just a single READ_ONCE() and returns NULL if the list is already empty. This was run against the devicemapper test suite's thin-provisioning suites for delete and suspend and no regressions were observed.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
· uraikan di kalkulator | Vendor | Produk | Versi terdampak |
|---|---|---|
| linux | linux kernel | Versi 3.15.1 hingga sebelum 5.4.290 |
| linux | linux kernel | Versi 5.5 hingga sebelum 5.10.234 |
| linux | linux kernel | Versi 5.11 hingga sebelum 5.15.177 |
| linux | linux kernel | Versi 5.16 hingga sebelum 6.1.125 |
| linux | linux kernel | Versi 6.2 hingga sebelum 6.6.72 |
| linux | linux kernel | Versi 6.7 hingga sebelum 6.12.10 |
| linux | linux kernel | Versi 3.15 |
| linux | linux kernel | Versi 3.15 rc4 |
| linux | linux kernel | Versi 3.15 rc5 |
| linux | linux kernel | Versi 3.15 rc6 |
| linux | linux kernel | Versi 3.15 rc7 |
| linux | linux kernel | Versi 3.15 rc8 |
| linux | linux kernel | Versi 6.13 rc1 |
| linux | linux kernel | Versi 6.13 rc2 |
| linux | linux kernel | Versi 6.13 rc3 |
| linux | linux kernel | Versi 6.13 rc4 |
| linux | linux kernel | Versi 6.13 rc5 |
| linux | linux kernel | Versi 6.13 rc6 |