GHSA-24FX-CXXF-WPF5
Vulnerability from github – Published: 2026-09-24 18:31 – Updated: 2026-09-24 18:31In 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": [],
"aliases": [
"CVE-2026-93236"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2026-09-24T16:17:19Z",
"severity": null
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: meson: vdec: fix NULL pointer deref in vdec_try_fmt_common\n\nWhen VIDIOC_TRY_FMT is called with an unsupported pixel format on the\nOUTPUT queue, vdec_try_fmt_common() falls back to V4L2_PIX_FMT_MPEG2.\nHowever, if a distro has locally patched MPEG2 support out (as it has\nbeen broken for some time) the platform format table does not contain\nMPEG2 so find_format() returns NULL and the subsequent dereference of\nfmt_out-\u003emax_width triggers a NULL pointer dereference.\n\nFix this by falling back to the first format in the platform\u0027s format\narray instead of hardcoding V4L2_PIX_FMT_MPEG2. This is always valid\nsince every platform defines at least one format.",
"id": "GHSA-24fx-cxxf-wpf5",
"modified": "2026-09-24T18:31:23Z",
"published": "2026-09-24T18:31:23Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2026-93236"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/20aa934ace6917262ff579a73ec018d06a7bad1c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/276f28672bb6d5d5feca78db4219c7b5adf1be26"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/3839b6be2279fc4f558723f2c0fbfc9c42070958"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/680a89683197cdfe4e03e6fd7755454c647d39c1"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/96dafbae77f50bfe2228bcfedcd8652c5e5f08e8"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/c620906fb1b2ad75d408ea9d06040d66952d4a31"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d61ba609c3226af3c84268ba606ea06ee63e511b"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/f2375a308640e401c142c5426d52c3d10e016d25"
}
],
"schema_version": "1.4.0",
"severity": []
}
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