CVE-2021-47657 drm/virtio: Ensure that objs is not NULL in virtio_gpu_array_put_free()

What is CVE-2021-47657?

CVE-2021-47657 is a medium-severity vulnerability in Linux kernel, published on 26 Feb 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:

drm/virtio: Ensure that objs is not NULL in virtio_gpu_array_put_free()

If virtio_gpu_object_shmem_init() fails (e.g. due to fault injection, as it happened in the bug report by syzbot), virtio_gpu_array_put_free() could be called with objs equal to NULL.

Ensure that objs is not NULL in virtio_gpu_array_put_free(), or otherwise return from the function.

Weakness: CWE-476

Which versions are affected by CVE-2021-47657?

It affects 1 product.

Products include Linux kernel.

How do I fix CVE-2021-47657?

Apply the vendor's patch.

Is CVE-2021-47657 being exploited?

There is no known exploitation of CVE-2021-47657 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 DEBIAN-CVE-2021-47657, GHSA-v9fj-g635-p6mj, UBUNTU-CVE-2021-47657.