CVE-2024-49872 mm/gup: fix memfd_pin_folios alloc race panic

What is CVE-2024-49872?

CVE-2024-49872 is a medium-severity vulnerability in Linux kernel, published on 21 Oct 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:

mm/gup: fix memfd_pin_folios alloc race panic

If memfd_pin_folios tries to create a hugetlb page, but someone else already did, then folio gets the value -EEXIST here:

folio = memfd_alloc_folio(memfd, start_idx); if (IS_ERR(folio)) { ret = PTR_ERR(folio); if (ret != -EEXIST) goto err;

then on the next trip through the "while start_idx" loop we panic here:

if (folio) { folio_put(folio);

To fix, set the folio to NULL on error.

Weakness: CWE-362

Which versions are affected by CVE-2024-49872?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2024-49872?

Apply the vendor's patch.

Is CVE-2024-49872 being exploited?

There is no known exploitation of CVE-2024-49872 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-2024-49872, DEBIAN-CVE-2024-49872, GHSA-rrh5-rfhq-mff2, UBUNTU-CVE-2024-49872.