CVE-2026-93236

Description

In the Linux kernel, the following vulnerability has been resolved: media: meson: vdec: fix NULL pointer deref in vdec_try_fmt_common When VIDIOC_TRY_FMT is called with an unsupported pixel format on the OUTPUT queue, vdec_try_fmt_common() falls back to V4L2_PIX_FMT_MPEG2. However, if a distro has locally patched MPEG2 support out (as it has been broken for some time) the platform format table does not contain MPEG2 so find_format() returns NULL and the subsequent dereference of fmt_out->max_width triggers a NULL pointer dereference. Fix this by falling back to the first format in the platform's format array instead of hardcoding V4L2_PIX_FMT_MPEG2. This is always valid since every platform defines at least one format.

References

• https://git.kernel.org/stable/c/20aa934ace6917262ff579a73ec018d06a7bad1c
• https://git.kernel.org/stable/c/276f28672bb6d5d5feca78db4219c7b5adf1be26
• https://git.kernel.org/stable/c/3839b6be2279fc4f558723f2c0fbfc9c42070958
• https://git.kernel.org/stable/c/680a89683197cdfe4e03e6fd7755454c647d39c1
• https://git.kernel.org/stable/c/96dafbae77f50bfe2228bcfedcd8652c5e5f08e8