CVE-2023-53684 xfrm: Zero padding when dumping algos and encap

What is CVE-2023-53684?

CVE-2023-53684 is a medium-severity vulnerability in Linux kernel, published on 7 Oct 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:

xfrm: Zero padding when dumping algos and encap

When copying data to user-space we should ensure that only valid data is copied over. Padding in structures may be filled with random (possibly sensitve) data and should never be given directly to user-space.

This patch fixes the copying of xfrm algorithms and the encap template in xfrm_user so that padding is zeroed.

Which versions are affected by CVE-2023-53684?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2023-53684?

Apply the vendor's patch.

Is CVE-2023-53684 being exploited?

There is no known exploitation of CVE-2023-53684 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-2023-53684, DEBIAN-CVE-2023-53684, GHSA-pmq6-ggff-fwmg, ROOT-OS-DEBIAN-11-CVE-2023-53684, UBUNTU-CVE-2023-53684.