Advisory Published
Updated

CVE-2024-53193: clk: clk-loongson2: Fix memory corruption bug in struct loongson2_clk_provider

First published: Fri Dec 27 2024(Updated: )

In the Linux kernel, the following vulnerability has been resolved: clk: clk-loongson2: Fix memory corruption bug in struct loongson2_clk_provider Some heap space is allocated for the flexible structure `struct clk_hw_onecell_data` and its flexible-array member `hws` through the composite structure `struct loongson2_clk_provider` in function `loongson2_clk_probe()`, as shown below: 289 struct loongson2_clk_provider *clp; ... 296 for (p = data; p->name; p++) 297 clks_num++; 298 299 clp = devm_kzalloc(dev, struct_size(clp, clk_data.hws, clks_num), 300 GFP_KERNEL); Then some data is written into the flexible array: 350 clp->clk_data.hws[p->id] = hw; This corrupts `clk_lock`, which is the spinlock variable immediately following the `clk_data` member in `struct loongson2_clk_provider`: struct loongson2_clk_provider { void __iomem *base; struct device *dev; struct clk_hw_onecell_data clk_data; spinlock_t clk_lock; /* protect access to DIV registers */ }; The problem is that the flexible structure is currently placed in the middle of `struct loongson2_clk_provider` instead of at the end. Fix this by moving `struct clk_hw_onecell_data clk_data;` to the end of `struct loongson2_clk_provider`. Also, add a code comment to help prevent this from happening again in case new members are added to the structure in the future. This change also fixes the following -Wflex-array-member-not-at-end warning: drivers/clk/clk-loongson2.c:32:36: warning: structure containing a flexible array member is not at the end of another structure [-Wflex-array-member-not-at-end]

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Affected SoftwareAffected VersionHow to fix
Linux Kernel
debian/linux
5.10.223-1
5.10.234-1
6.1.129-1
6.1.135-1
6.12.22-1
6.12.25-1

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Frequently Asked Questions

  • What is the severity of CVE-2024-53193?

    CVE-2024-53193 is classified as a medium severity vulnerability in the Linux kernel.

  • How do I fix CVE-2024-53193?

    To resolve CVE-2024-53193, upgrade your Linux kernel to one of the fixed versions such as 5.10.223-1 or 6.12.15-1.

  • Which versions of the Linux kernel are affected by CVE-2024-53193?

    CVE-2024-53193 affects specific versions of the Linux kernel prior to the patched releases, including versions before 5.10.223-1, 6.1.123-1, and 6.12.12-1.

  • What type of vulnerability is CVE-2024-53193?

    CVE-2024-53193 is a memory corruption vulnerability found in the clk-loongson2 functionality of the Linux kernel.

  • Is CVE-2024-53193 related to any specific hardware or software?

    CVE-2024-53193 primarily affects systems using the Linux kernel, particularly in relation to the Loongson2 clock provider implementation.

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