Description
In the Linux kernel, the following vulnerability has been resolved:
dm-pcache: reject option groups without values
The pcache target parses optional arguments as name/value pairs. A table that advertises one optional argument and supplies only a recognized option name, for example "cache_mode", reaches parse_cache_opts() with argc == 1. The parser consumes the name, decrements argc to zero, then calls dm_shift_arg() again for the value. dm_shift_arg() returns NULL when no arguments remain, and the following strcmp() dereferences that NULL pointer.
Check that each recognized option has a value before consuming it. This keeps valid "cache_mode writeback" and "data_crc true/false" tables unchanged while making malformed tables fail during target construction with a precise missing-value error.
Metrics
No CVSS score has been published yet.
Affected software
Source: the vendor's advisory (CNA). NVD analysis pending.
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0, < 1247615aadb74c89c1b2f01a6de7df9dab92ecb3; >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0, < 0cbe13fe540330d31e5273bbf8cbd66bc7c9cb5a; >= 1d57628ff95b32d5cfa8d8f50e07690c161e9cf0, < d9c631e3fbd44246a2be781d26cfacbb9b8ec127 |
| Linux | Linux | 6.18 |
References
Timeline
- Published
- Aug 15, 2026
- Last modified
- Aug 17, 2026
- NVD status
- Received