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Message-ID: <2025071009-CVE-2025-38277-520c@gregkh> Date: Thu, 10 Jul 2025 09:42:18 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: linux-cve-announce@...r.kernel.org Cc: Greg Kroah-Hartman <gregkh@...nel.org> Subject: CVE-2025-38277: mtd: nand: ecc-mxic: Fix use of uninitialized variable ret From: Greg Kroah-Hartman <gregkh@...nel.org> 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. The Linux kernel CVE team has assigned CVE-2025-38277 to this issue. Affected and fixed versions =========================== Issue introduced in 5.18 with commit 48e6633a9fa2400b53a964358753769f291a7eb0 and fixed in 6.1.142 with commit 4d9d6e4be09472aa72953caca3dbefdc27846170 Issue introduced in 5.18 with commit 48e6633a9fa2400b53a964358753769f291a7eb0 and fixed in 6.6.94 with commit a0d9d9b5a4634e146ae41cb25667322e5c7d74d2 Issue introduced in 5.18 with commit 48e6633a9fa2400b53a964358753769f291a7eb0 and fixed in 6.12.34 with commit 7a23cc510ecaabab4f6df7e9d910d16e279b72ad Issue introduced in 5.18 with commit 48e6633a9fa2400b53a964358753769f291a7eb0 and fixed in 6.15.3 with commit 49482f4a39620f6afedcd3f6aa9e0d558b6a460b Issue introduced in 5.18 with commit 48e6633a9fa2400b53a964358753769f291a7eb0 and fixed in 6.16-rc1 with commit d95846350aac72303036a70c4cdc69ae314aa26d Please see https://www.kernel.org for a full list of currently supported kernel versions by the kernel community. Unaffected versions might change over time as fixes are backported to older supported kernel versions. The official CVE entry at https://cve.org/CVERecord/?id=CVE-2025-38277 will be updated if fixes are backported, please check that for the most up to date information about this issue. Affected files ============== The file(s) affected by this issue are: drivers/mtd/nand/ecc-mxic.c Mitigation ========== The Linux kernel CVE team recommends that you update to the latest stable kernel version for this, and many other bugfixes. Individual changes are never tested alone, but rather are part of a larger kernel release. Cherry-picking individual commits is not recommended or supported by the Linux kernel community at all. If however, updating to the latest release is impossible, the individual changes to resolve this issue can be found at these commits: https://git.kernel.org/stable/c/4d9d6e4be09472aa72953caca3dbefdc27846170 https://git.kernel.org/stable/c/a0d9d9b5a4634e146ae41cb25667322e5c7d74d2 https://git.kernel.org/stable/c/7a23cc510ecaabab4f6df7e9d910d16e279b72ad https://git.kernel.org/stable/c/49482f4a39620f6afedcd3f6aa9e0d558b6a460b https://git.kernel.org/stable/c/d95846350aac72303036a70c4cdc69ae314aa26d
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