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.
How to fix
- Linux Linux276f28672bb6d5d5feca78db4219c7b5adf1be26, c620906fb1b2ad75d408ea9d06040d66952d4a31, 3839b6be2279fc4f558723f2c0fbfc9c42070958, 680a89683197cdfe4e03e6fd7755454c647d39c1, f2375a308640e401c142c5426d52c3d10e016d25, 96dafbae77f50bfe2228bcfedcd8652c5e5f08e8, d61ba609c3226af3c84268ba606ea06ee63e511b, 20aa934ace6917262ff579a73ec018d06a7bad1c or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 3e7f51bd96077acad6acd7b45668f65b44233c4e ≤ v < 276f28672bb6d5d5feca78db4219c7b5adf1be26, 3e7f51bd96077acad6acd7b45668f65b44233c4e ≤ v < c620906fb1b2ad75d408ea9d06040d66952d4a31, 3e7f51bd96077acad6acd7b45668f65b44233c4e ≤ v < 3839b6be2279fc4f558723f2c0fbfc9c42070958, 3e7f51bd96077acad6acd7b45668f65b44233c4e ≤ v < 680a89683197cdfe4e03e6fd7755454c647d39c1, 3e7f51bd96077acad6acd7b45668f65b44233c4e ≤ v < f2375a308640e401c142c5426d52c3d10e016d25, 3e7f51bd96077acad6acd7b45668f65b44233c4e ≤ v < 96dafbae77f50bfe2228bcfedcd8652c5e5f08e8, 3e7f51bd96077acad6acd7b45668f65b44233c4e ≤ v < d61ba609c3226af3c84268ba606ea06ee63e511b, 3e7f51bd96077acad6acd7b45668f65b44233c4e ≤ v < 20aa934ace6917262ff579a73ec018d06a7bad1c, 5.3 | 276f28672bb6d5d5feca78db4219c7b5adf1be26, c620906fb1b2ad75d408ea9d06040d66952d4a31, 3839b6be2279fc4f558723f2c0fbfc9c42070958, 680a89683197cdfe4e03e6fd7755454c647d39c1, f2375a308640e401c142c5426d52c3d10e016d25, 96dafbae77f50bfe2228bcfedcd8652c5e5f08e8, d61ba609c3226af3c84268ba606ea06ee63e511b, 20aa934ace6917262ff579a73ec018d06a7bad1c |
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