{"id":"CVE-2026-89724","summary":"media: vicodec: fix out-of-bounds write in FWHT encoder","details":"In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: vicodec: fix out-of-bounds write in FWHT encoder\n\nvidioc_s_fmt_vid_out() sizes the encoder CAPTURE buffer from the\ncompressed descriptor pixfmt_fwht, whose sizeimage_mult is 3:\ncoded_w * coded_h * 3 + sizeof(struct fwht_cframe_hdr). fwht_encode_frame()\nencodes one plane per component, and an incompressible plane takes the\nFWHT_FRAME_UNENCODED path in encode_plane(), copying the plane verbatim.\n\nFor a 4-component pixel format all four planes are full resolution\n(width_div == height_div == 1), so a frame that forces every plane\nthrough the unencoded fallback writes\nsizeof(struct fwht_cframe_hdr) + 4 * coded_w * coded_h bytes, overrunning\nthe plane by coded_w * coded_h, which can result in corruption\nof adjacent kernel heap memory.\n\nBump pixfmt_fwht.sizeimage_mult from 3 to 4, matching the largest\ncomponents_num among the supported raw formats, so the capture buffer is\nalways large enough for the unencoded fallback.","modified":"2026-09-14T03:46:27.474631826Z","published":"2026-09-11T19:46:35.914Z","database_specific":{"osv_generated_from":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89724.json","cna_assigner":"Linux"},"references":[{"type":"WEB","url":"https://git.kernel.org/stable/c/84cfebf7f4229d748cca8eb9c4e1f1c4099d3ab7"},{"type":"WEB","url":"https://git.kernel.org/stable/c/8c14472431e27f13661d0db9d837156eaced0ecb"},{"type":"WEB","url":"https://git.kernel.org/stable/c/b95315ffc66b39856396c1043618bb4e4d5785ba"},{"type":"WEB","url":"https://git.kernel.org/stable/c/cf4500ebf6fb57bf4ab83c3dd349a40257dbe2a9"},{"type":"ADVISORY","url":"https://github.com/CVEProject/cvelistV5/tree/main/cves/2026/89xxx/CVE-2026-89724.json"},{"type":"ADVISORY","url":"https://nvd.nist.gov/vuln/detail/CVE-2026-89724"},{"type":"PACKAGE","url":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git"}],"affected":[{"ranges":[{"type":"GIT","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","events":[{"introduced":"16ecf6dff97ce0194a7126e26159492668d47a7e"},{"fixed":"84cfebf7f4229d748cca8eb9c4e1f1c4099d3ab7"},{"fixed":"8c14472431e27f13661d0db9d837156eaced0ecb"},{"fixed":"b95315ffc66b39856396c1043618bb4e4d5785ba"},{"fixed":"cf4500ebf6fb57bf4ab83c3dd349a40257dbe2a9"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89724.json"}},{"package":{"name":"Kernel","ecosystem":"Linux"},"ranges":[{"type":"ECOSYSTEM","events":[{"introduced":"5.0.0"},{"fixed":"6.12.109"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.13.0"},{"fixed":"6.18.50"}]},{"type":"ECOSYSTEM","events":[{"introduced":"6.19.0"},{"fixed":"7.2.4"}]}],"database_specific":{"source":"https://storage.googleapis.com/cve-osv-conversion/osv-output/CVE-2026-89724.json"}}],"schema_version":"1.9.0","severity":[{"type":"CVSS_V3","score":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H"}]}