CVE-2026-72104

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 "cachemode", reaches parsecacheopts() with argc == 1. The parser consumes the name, decrements argc to zero, then calls dmshiftarg() again for the value. dmshift_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 "cachemode writeback" and "datacrc true/false" tables unchanged while making malformed tables fail during target construction with a precise missing-value error.