Description
In the Linux kernel, the following vulnerability has been resolved: mtd: nand: ecc-mxic: Fix use of uninitialized variable ret If ctx->steps is zero, the loop processing ECC steps is skipped, and the variable ret remains uninitialized. It is later checked and returned, which leads to undefined behavior and may cause unpredictable results in user space or kernel crashes. This scenario can be triggered in edge cases such as misconfigured geometry, ECC engine misuse, or if ctx->steps is not validated after initialization. Initialize ret to zero before the loop to ensure correct and safe behavior regardless of the ctx->steps value. Found by Linux Verification Center (linuxtesting.org) with SVACE.
Product status
48e6633a9fa2400b53a964358753769f291a7eb0 (git) before 4d9d6e4be09472aa72953caca3dbefdc27846170
48e6633a9fa2400b53a964358753769f291a7eb0 (git) before a0d9d9b5a4634e146ae41cb25667322e5c7d74d2
48e6633a9fa2400b53a964358753769f291a7eb0 (git) before 7a23cc510ecaabab4f6df7e9d910d16e279b72ad
48e6633a9fa2400b53a964358753769f291a7eb0 (git) before 49482f4a39620f6afedcd3f6aa9e0d558b6a460b
48e6633a9fa2400b53a964358753769f291a7eb0 (git) before d95846350aac72303036a70c4cdc69ae314aa26d
5.18
Any version before 5.18
6.1.142 (semver)
6.6.94 (semver)
6.12.34 (semver)
6.15.3 (semver)
6.16 (original_commit_for_fix)
References
lists.debian.org/debian-lts-announce/2025/10/msg00008.html
git.kernel.org/...c/4d9d6e4be09472aa72953caca3dbefdc27846170
git.kernel.org/...c/a0d9d9b5a4634e146ae41cb25667322e5c7d74d2
git.kernel.org/...c/7a23cc510ecaabab4f6df7e9d910d16e279b72ad
git.kernel.org/...c/49482f4a39620f6afedcd3f6aa9e0d558b6a460b
git.kernel.org/...c/d95846350aac72303036a70c4cdc69ae314aa26d