Linux Kernel up to 5.17.3 clock.c ep93xx_clk_register_gate use after free

Summaryinfo

A vulnerability categorized as critical has been discovered in Linux Kernel up to 5.17.3. Impacted is the function ep93xx_clk_register_gate of the file arch/arm/mach-ep93xx/clock.c. Such manipulation leads to use after free. This vulnerability is listed as CVE-2022-49047. There is no available exploit. It is advisable to upgrade the affected component.

Detailsinfo

A vulnerability was found in Linux Kernel up to 5.17.3. It has been rated as critical. Affected by this issue is the function ep93xx_clk_register_gate of the file arch/arm/mach-ep93xx/clock.c. The manipulation with an unknown input leads to a use after free vulnerability. Using CWE to declare the problem leads to CWE-416. Referencing memory after it has been freed can cause a program to crash, use unexpected values, or execute code. Impacted is confidentiality, integrity, and availability. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: ep93xx: clock: Fix UAF in ep93xx_clk_register_gate() arch/arm/mach-ep93xx/clock.c:154:2: warning: Use of memory after it is freed [clang-analyzer-unix.Malloc] arch/arm/mach-ep93xx/clock.c:151:2: note: Taking true branch if (IS_ERR(clk)) ^ arch/arm/mach-ep93xx/clock.c:152:3: note: Memory is released kfree(psc); ^~~~~~~~~~ arch/arm/mach-ep93xx/clock.c:154:2: note: Use of memory after it is freed return &psc->hw; ^ ~~~~~~~~

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2022-49047 since 02/26/2025. The exploitation is known to be easy. There are known technical details, but no exploit is available. The current price for an exploit might be approx. USD $0-$5k (estimation calculated on 03/25/2025).

Upgrading to version 5.17.4 eliminates this vulnerability. Applying the patch 0f12166872da46c6b57ba2f1314bbf310b3bf017/3b68b08885217abd9c57ff9b3bb3eb173eee02a9 is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.17.0
• 5.17.1
• 5.17.2
• 5.17.3

License

• open-source

Website

• Vendor: https://www.kernel.org/

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