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.

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References

Other 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 https://git.kernel.org/stable/c/c620906fb1b2ad75d408ea9d06040d66952d4a31 https://git.kernel.org/stable/c/d61ba609c3226af3c84268ba606ea06ee63e511b https://git.kernel.org/stable/c/f2375a308640e401c142c5426d52c3d10e016d25

Frequently Asked Questions

What is CVE-2026-93236? +

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.

How do I check if I'm vulnerable to CVE-2026-93236? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

CVE-2026-93236

Description

References

Other References

Frequently Asked Questions

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