CVE-2025-21997 xsk: fix an integer overflow in xp_create_and_assign_umem()

What is CVE-2025-21997?

CVE-2025-21997 is a medium-severity vulnerability in Linux kernel, published on 3 Apr 2025. 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:

xsk: fix an integer overflow in xp_create_and_assign_umem()

Since the i and pool->chunk_size variables are of type 'u32', their product can wrap around and then be cast to 'u64'. This can lead to two different XDP buffers pointing to the same memory area.

Found by InfoTeCS on behalf of Linux Verification Center (linuxtesting.org) with SVACE.

Weakness: CWE-190

Which versions are affected by CVE-2025-21997?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2025-21997?

Apply the vendor's patch.

Is CVE-2025-21997 being exploited?

There is no known exploitation of CVE-2025-21997 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 AZL-59904, BELL-CVE-2025-21997, DEBIAN-CVE-2025-21997, GHSA-pg24-62pw-76fp, ROOT-OS-UBUNTU-2404-CVE-2025-21997, UBUNTU-CVE-2025-21997.