CVE-2023-52504

HIGH
Published Mar 2, 2024 Modified Dec 11, 2024 CWE-125

Description

In the Linux kernel, the following vulnerability has been resolved: x86/alternatives: Disable KASAN in apply_alternatives() Fei has reported that KASAN triggers during apply_alternatives() on a 5-level paging machine: BUG: KASAN: out-of-bounds in rcu_is_watching() Read of size 4 at addr ff110003ee6419a0 by task swapper/0/0 ... __asan_load4() rcu_is_watching() trace_hardirqs_on() text_poke_early() apply_alternatives() ... On machines with 5-level paging, cpu_feature_enabled(X86_FEATURE_LA57) gets patched. It includes KASAN code, where KASAN_SHADOW_START depends on __VIRTUAL_MASK_SHIFT, which is defined with cpu_feature_enabled(). KASAN gets confused when apply_alternatives() patches the KASAN_SHADOW_START users. A test patch that makes KASAN_SHADOW_START static, by replacing __VIRTUAL_MASK_SHIFT with 56, works around the issue. Fix it for real by disabling KASAN while the kernel is patching alternatives. [ mingo: updated the changelog ]

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CVSS v3.1 Score

7.1
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H

Weakness Type (CWE)

CWE-125 Out-of-bounds Read

Affected Products

Vendor Product
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel
linux linux_kernel

References

Advisories & Patches

https://git.kernel.org/stable/c/3719d3c36aa853d5a2401af9f8d6b116c91ad5ae https://git.kernel.org/stable/c/3770c38cd6a60494da29ac2da73ff8156440a2d1 https://git.kernel.org/stable/c/5b784489c8158518bf7a466bb3cc045b0fb66b4b https://git.kernel.org/stable/c/6788b10620ca6e98575d1e06e72a8974aad7657e https://git.kernel.org/stable/c/cd287cc208dfe6bd6da98e7f88e723209242c9b4 https://git.kernel.org/stable/c/d35652a5fc9944784f6f50a5c979518ff8dacf61 https://git.kernel.org/stable/c/ecba5afe86f30605eb9dfb7f265a8de0218d4cfc https://git.kernel.org/stable/c/3719d3c36aa853d5a2401af9f8d6b116c91ad5ae https://git.kernel.org/stable/c/3770c38cd6a60494da29ac2da73ff8156440a2d1 https://git.kernel.org/stable/c/5b784489c8158518bf7a466bb3cc045b0fb66b4b https://git.kernel.org/stable/c/6788b10620ca6e98575d1e06e72a8974aad7657e https://git.kernel.org/stable/c/cd287cc208dfe6bd6da98e7f88e723209242c9b4 https://git.kernel.org/stable/c/d35652a5fc9944784f6f50a5c979518ff8dacf61 https://git.kernel.org/stable/c/ecba5afe86f30605eb9dfb7f265a8de0218d4cfc

Frequently Asked Questions

What is CVE-2023-52504? +
In the Linux kernel, the following vulnerability has been resolved: x86/alternatives: Disable KASAN in apply_alternatives() Fei has reported that KASAN triggers during apply_alternatives() on a 5-level paging machine: BUG: KASAN: out-of-bounds in rcu_is_watching() Read of size 4 at addr ff110003ee6419a0 by task swapper/0/0 ... __asan_load4() rcu_is_watching() trace_hardirqs_on() text_poke_early() apply_alternatives() ... On machines with 5-level paging, cpu_feature_enabled(X86_FEATURE_LA57) gets patched. It includes KASAN code, where KASAN_SHADOW_START depends on __VIRTUAL_MASK_SHIFT, which is defined with cpu_feature_enabled(). KASAN gets confused when apply_alternatives() patches the KASAN_SHADOW_START users. A test patch that makes KASAN_SHADOW_START static, by replacing __VIRTUAL_MASK_SHIFT with 56, works around the issue. Fix it for real by disabling KASAN while the kernel is patching alternatives. [ mingo: updated the changelog ] It has a CVSS v3.1 base score of 7.1 (HIGH).
How severe is CVE-2023-52504? +
CVE-2023-52504 has a CVSS v3.1 score of 7.1 out of 10, rated HIGH. This is a high-severity vulnerability that should be prioritized for patching.
What products are affected by CVE-2023-52504? +
CVE-2023-52504 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.
How do I check if I'm vulnerable to CVE-2023-52504? +
You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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