CVE-2026-72104

Summary

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.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/1247615aadb74c89c1b2f01a6de7df9dab92ecb3
• https://git.kernel.org/stable/c/0cbe13fe540330d31e5273bbf8cbd66bc7c9cb5a
• https://git.kernel.org/stable/c/d9c631e3fbd44246a2be781d26cfacbb9b8ec127

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