CVE-2024-42242 mmc: sdhci: Fix max_seg_size for 64KiB PAGE_SIZE

What is CVE-2024-42242?

CVE-2024-42242 is a medium-severity denial of service vulnerability in Linux kernel, published on 7 Aug 2024. It can only be exploited from the same machine or local network, with no action from the victim.

Official description

In the Linux kernel, the following vulnerability has been resolved:

mmc: sdhci: Fix max_seg_size for 64KiB PAGE_SIZE

blk_queue_max_segment_size() ensured:

if (max_size < PAGE_SIZE) max_size = PAGE_SIZE;

whereas:

blk_validate_limits() makes it an error:

if (WARN_ON_ONCE(lim->max_segment_size < PAGE_SIZE)) return -EINVAL;

The change from one to the other, exposed sdhci which was setting maximum segment size too low in some circumstances.

Fix the maximum segment size when it is too low.

Weakness: CWE-770

Which versions are affected by CVE-2024-42242?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-42242?

Apply the vendor's patch.

Upgrade, then put limits on request size, rate and nesting depth so one client cannot exhaust the service. More about Denial of service.

Is CVE-2024-42242 being exploited?

There is no known exploitation of CVE-2024-42242 in the wild and no public exploit code.

Other vulnerabilities in Linux kernel

• CVE-2026-53266 Linux Kernel Out-of-Bounds Write Exploited High 8.8
• CVE-2013-6282 Linux Kernel Improper Input Validation Exploited High 8.8
• CVE-2022-0185 Linux Kernel Heap-Based Buffer Overflow Exploited High 8.4
• CVE-2013-2094 Linux Kernel Privilege Escalation Exploited High 8.4
• CVE-2026-53362 Linux Kernel Unspecified Exploited High 7.8

All Linux kernel vulnerabilities

Sources

• CVE record
• NVD
• OSV
• GitHub advisory
• How this page is made

Also known as BELL-CVE-2024-42242, DEBIAN-CVE-2024-42242, GHSA-g92r-8x2f-9v8m, UBUNTU-CVE-2024-42242.