CVE-2026-93236

Summary

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux3e7f51bd96077acad6acd7b45668f65b44233c4e < 276f28672bb6d5d5feca78db4219c7b5adf1be26affected
LinuxLinux3e7f51bd96077acad6acd7b45668f65b44233c4e < c620906fb1b2ad75d408ea9d06040d66952d4a31affected
LinuxLinux3e7f51bd96077acad6acd7b45668f65b44233c4e < 3839b6be2279fc4f558723f2c0fbfc9c42070958affected
LinuxLinux3e7f51bd96077acad6acd7b45668f65b44233c4e < 680a89683197cdfe4e03e6fd7755454c647d39c1affected
LinuxLinux3e7f51bd96077acad6acd7b45668f65b44233c4e < f2375a308640e401c142c5426d52c3d10e016d25affected
LinuxLinux3e7f51bd96077acad6acd7b45668f65b44233c4e < 96dafbae77f50bfe2228bcfedcd8652c5e5f08e8affected
LinuxLinux3e7f51bd96077acad6acd7b45668f65b44233c4e < d61ba609c3226af3c84268ba606ea06ee63e511baffected
LinuxLinux3e7f51bd96077acad6acd7b45668f65b44233c4e < 20aa934ace6917262ff579a73ec018d06a7bad1caffected
LinuxLinux5.3affected
LinuxLinux0 < 5.3unaffected
LinuxLinux5.10.270 <= 5.10.*unaffected
LinuxLinux5.15.221 <= 5.15.*unaffected
LinuxLinux6.1.188 <= 6.1.*unaffected
LinuxLinux6.6.157 <= 6.6.*unaffected
LinuxLinux6.12.110 <= 6.12.*unaffected
LinuxLinux6.18.51 <= 6.18.*unaffected
LinuxLinux7.2.5 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References