Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: dm-pcache: fix use-after-free and invalid seg operations in kset_replay() In kset_replay, when key->seg_gen is stale (key->seg_gen < key->cache_pos.cache_seg->gen), cache_key_put(key) is called but then key->cache_pos.cache_seg is accessed as the argument to cache_seg_get(). This is a use-after-free on the freed key memory. Although mempool recycled memory is not immediately reclaimed or overwritten in practice, this is still a potential UAF bug. Additionally, for expired invalid keys, setting the cache->seg_map bit and calling cache_seg_get() is unreasonable since the corresponding segment data is no longer valid. Fix both issues by moving cache_seg_get() and __set_bit() after the gen check, so they only execute for valid keys, and using continue to skip invalid keys.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 before 1894fc7a3bab90143dcd26ef8ee27040ef4a7501; affected 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 before f39a3e9cc5946473e16d6f5071b2ee0216c56d06; affected 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0 before c2e894eac398b258f12fdec73ed6ba081047f7b3 |
| Linux / Linux | affected 6.18; unaffected 0 before 6.18; unaffected 6.18.50 through 6.18.*; unaffected 7.2.4 through 7.2.*; unaffected 7.3 through * |
CWE
No CWE identifiers supplied.