CVE-2024-35987

riscv: Fix loading 64-bit NOMMU kernels past the start of RAM

Description

In the Linux kernel, the following vulnerability has been resolved: riscv: Fix loading 64-bit NOMMU kernels past the start of RAM commit 3335068f8721 ("riscv: Use PUD/P4D/PGD pages for the linear mapping") added logic to allow using RAM below the kernel load address. However, this does not work for NOMMU, where PAGE_OFFSET is fixed to the kernel load address. Since that range of memory corresponds to PFNs below ARCH_PFN_OFFSET, mm initialization runs off the beginning of mem_map and corrupts adjacent kernel memory. Fix this by restoring the previous behavior for NOMMU kernels.

N/A

CVSS

Severity:

EPSS 0.13%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/b008e327fa570aca210f98c817757649bae56694
https://git.kernel.org/stable/c/ea6628e4e2353978af7e3b4ad4fdaab6149acf3d
https://git.kernel.org/stable/c/aea702dde7e9876fb00571a2602f25130847bf0f

Frequently Asked Questions

What is the severity of CVE-2024-35987?: CVE-2024-35987 has not yet been assigned a CVSS score.
How to fix CVE-2024-35987?: To fix CVE-2024-35987, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2024-35987 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2024-35987 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2024-35987?: CVE-2024-35987 affects Linux Linux, Linux Linux.

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