CVE-2024-50253

bpf: Check the validity of nr_words in bpf_iter_bits_new()

Description

In the Linux kernel, the following vulnerability has been resolved: bpf: Check the validity of nr_words in bpf_iter_bits_new() Check the validity of nr_words in bpf_iter_bits_new(). Without this check, when multiplication overflow occurs for nr_bits (e.g., when nr_words = 0x0400-0001, nr_bits becomes 64), stack corruption may occur due to bpf_probe_read_kernel_common(..., nr_bytes = 0x2000-0008). Fix it by limiting the maximum value of nr_words to 511. The value is derived from the current implementation of BPF memory allocator. To ensure compatibility if the BPF memory allocator's size limitation changes in the future, use the helper bpf_mem_alloc_check_size() to check whether nr_bytes is too larger. And return -E2BIG instead of -ENOMEM for oversized nr_bytes.

5.5

CVSS

Severity: Medium

CVSS 3.1 •

EPSS 0.03%

Affected: Linux Linux

References

Link	Tags
https://git.kernel.org/stable/c/c9539e09c67880ecd88b51188c346a2cc078b06c	patch
https://git.kernel.org/stable/c/393397fbdcad7396639d7077c33f86169184ba99	patch

Frequently Asked Questions

What is the severity of CVE-2024-50253?: CVE-2024-50253 has been scored as a medium severity vulnerability.
How to fix CVE-2024-50253?: To fix CVE-2024-50253, 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-2024-50253 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2024-50253 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-2024-50253?: CVE-2024-50253 affects Linux Linux, Linux Linux.

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