{"id":"CVE-2026-89724","state":"PUBLISHED","title":"media: vicodec: fix out-of-bounds write in FWHT encoder","description":"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.","publishedAt":"2026-09-11T19:46:35.914Z","updatedAt":"2026-10-19T08:51:37.470Z","severity":{"score":7.8,"label":"High","version":"3.1","vector":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","source":"Linux"},"assigner":"Linux","products":["Linux Linux"],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"16ecf6dff97ce0194a7126e26159492668d47a7e","status":"affected","lessThan":"f7ae26c100a6c26c2a166d2c41e73188067b36bd","versionType":"git"},{"version":"16ecf6dff97ce0194a7126e26159492668d47a7e","status":"affected","lessThan":"6ea647e76c44387d5c1c635df4604c2154d9060e","versionType":"git"},{"version":"16ecf6dff97ce0194a7126e26159492668d47a7e","status":"affected","lessThan":"d40838a63f2bd6a3df0a6cdd8ff1d5c6366e8fff","versionType":"git"},{"version":"16ecf6dff97ce0194a7126e26159492668d47a7e","status":"affected","lessThan":"e21cccc29b840930cd9dcfdf1139658063a681af","versionType":"git"},{"version":"16ecf6dff97ce0194a7126e26159492668d47a7e","status":"affected","lessThan":"84cfebf7f4229d748cca8eb9c4e1f1c4099d3ab7","versionType":"git"},{"version":"16ecf6dff97ce0194a7126e26159492668d47a7e","status":"affected","lessThan":"8c14472431e27f13661d0db9d837156eaced0ecb","versionType":"git"},{"version":"16ecf6dff97ce0194a7126e26159492668d47a7e","status":"affected","lessThan":"b95315ffc66b39856396c1043618bb4e4d5785ba","versionType":"git"},{"version":"16ecf6dff97ce0194a7126e26159492668d47a7e","status":"affected","lessThan":"cf4500ebf6fb57bf4ab83c3dd349a40257dbe2a9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/test-drivers/vicodec/vicodec-core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.0","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/test-drivers/vicodec/vicodec-core.c"]}],"references":["https://git.kernel.org/stable/c/f7ae26c100a6c26c2a166d2c41e73188067b36bd","https://git.kernel.org/stable/c/6ea647e76c44387d5c1c635df4604c2154d9060e","https://git.kernel.org/stable/c/d40838a63f2bd6a3df0a6cdd8ff1d5c6366e8fff","https://git.kernel.org/stable/c/e21cccc29b840930cd9dcfdf1139658063a681af","https://git.kernel.org/stable/c/84cfebf7f4229d748cca8eb9c4e1f1c4099d3ab7","https://git.kernel.org/stable/c/8c14472431e27f13661d0db9d837156eaced0ecb","https://git.kernel.org/stable/c/b95315ffc66b39856396c1043618bb4e4d5785ba","https://git.kernel.org/stable/c/cf4500ebf6fb57bf4ab83c3dd349a40257dbe2a9"],"weaknesses":[],"ingestedAt":"2026-10-29T20:13:26.108Z","source":{"repository":"CVEProject/cvelistV5","path":"cves/2026/89xxx/CVE-2026-89724.json","commit":"556c9d3a8cd17e218bb8e452ba7cd619a384ff47"},"raw":{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2026-89724","state":"PUBLISHED","datePublished":"2026-09-11T19:46:35.914Z","dateUpdated":"2026-10-19T08:51:37.470Z","assignerShortName":"Linux","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateReserved":"2026-09-11T19:38:34.759Z"},"containers":{"cna":{"title":"media: vicodec: fix out-of-bounds write in FWHT encoder","descriptions":[{"lang":"en","value":"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."}],"affected":[{"vendor":"Linux","product":"Linux","defaultStatus":"unaffected","versions":[{"version":"16ecf6dff97ce0194a7126e26159492668d47a7e","status":"affected","lessThan":"f7ae26c100a6c26c2a166d2c41e73188067b36bd","versionType":"git"},{"version":"16ecf6dff97ce0194a7126e26159492668d47a7e","status":"affected","lessThan":"6ea647e76c44387d5c1c635df4604c2154d9060e","versionType":"git"},{"version":"16ecf6dff97ce0194a7126e26159492668d47a7e","status":"affected","lessThan":"d40838a63f2bd6a3df0a6cdd8ff1d5c6366e8fff","versionType":"git"},{"version":"16ecf6dff97ce0194a7126e26159492668d47a7e","status":"affected","lessThan":"e21cccc29b840930cd9dcfdf1139658063a681af","versionType":"git"},{"version":"16ecf6dff97ce0194a7126e26159492668d47a7e","status":"affected","lessThan":"84cfebf7f4229d748cca8eb9c4e1f1c4099d3ab7","versionType":"git"},{"version":"16ecf6dff97ce0194a7126e26159492668d47a7e","status":"affected","lessThan":"8c14472431e27f13661d0db9d837156eaced0ecb","versionType":"git"},{"version":"16ecf6dff97ce0194a7126e26159492668d47a7e","status":"affected","lessThan":"b95315ffc66b39856396c1043618bb4e4d5785ba","versionType":"git"},{"version":"16ecf6dff97ce0194a7126e26159492668d47a7e","status":"affected","lessThan":"cf4500ebf6fb57bf4ab83c3dd349a40257dbe2a9","versionType":"git"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/test-drivers/vicodec/vicodec-core.c"]},{"vendor":"Linux","product":"Linux","defaultStatus":"affected","versions":[{"version":"5.0","status":"affected"},{"version":"0","status":"unaffected","lessThan":"5.0","versionType":"semver"},{"version":"5.10.270","status":"unaffected","lessThanOrEqual":"5.10.*","versionType":"semver"},{"version":"5.15.221","status":"unaffected","lessThanOrEqual":"5.15.*","versionType":"semver"},{"version":"6.1.188","status":"unaffected","lessThanOrEqual":"6.1.*","versionType":"semver"},{"version":"6.6.157","status":"unaffected","lessThanOrEqual":"6.6.*","versionType":"semver"},{"version":"6.12.109","status":"unaffected","lessThanOrEqual":"6.12.*","versionType":"semver"},{"version":"6.18.50","status":"unaffected","lessThanOrEqual":"6.18.*","versionType":"semver"},{"version":"7.2.4","status":"unaffected","lessThanOrEqual":"7.2.*","versionType":"semver"},{"version":"7.3","status":"unaffected","lessThanOrEqual":"*","versionType":"original_commit_for_fix"}],"repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/media/test-drivers/vicodec/vicodec-core.c"]}],"references":[{"url":"https://git.kernel.org/stable/c/f7ae26c100a6c26c2a166d2c41e73188067b36bd"},{"url":"https://git.kernel.org/stable/c/6ea647e76c44387d5c1c635df4604c2154d9060e"},{"url":"https://git.kernel.org/stable/c/d40838a63f2bd6a3df0a6cdd8ff1d5c6366e8fff"},{"url":"https://git.kernel.org/stable/c/e21cccc29b840930cd9dcfdf1139658063a681af"},{"url":"https://git.kernel.org/stable/c/84cfebf7f4229d748cca8eb9c4e1f1c4099d3ab7"},{"url":"https://git.kernel.org/stable/c/8c14472431e27f13661d0db9d837156eaced0ecb"},{"url":"https://git.kernel.org/stable/c/b95315ffc66b39856396c1043618bb4e4d5785ba"},{"url":"https://git.kernel.org/stable/c/cf4500ebf6fb57bf4ab83c3dd349a40257dbe2a9"}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The overflow is reached only through local V4L2 ioctls (VIDIOC_S_FMT, VIDIOC_REQBUFS, VIDIOC_QBUF, VIDIOC_STREAMON) on the vicodec stateful-encoder /dev/videoN node; there is no network or adjacent-protocol path into fwht_encode_frame().\nAC:L - An attacker selects a 4-component OUTPUT format (RGBA32/ARGB32 and similar), feeds incompressible planes (and may set QP=1), and starts streaming so every plane takes the FWHT_FRAME_UNENCODED copy path; no race or uncontrolled memory-layout precondition is required.\nPR:L - vicodec_open() and the encoder ioctl path perform no capability checks; any local user who can open the video node (video group or logind/udev uaccess on desktops, Android, and media CI) can trigger the overflow.\nUI:N - The attacking process opens the encoder node, sets the 4-component format, queues incompressible buffers, and starts streaming itself; no victim action or cooperation is required.\nS:U - The out-of-bounds write corrupts kernel memory in the same security authority as the kernel itself; this is a conventional in-kernel vmalloc/heap overflow, not a VM, IOMMU, or sandbox boundary crossing.\nC:H - encode_plane() writes past the vb2 capture plane into adjacent kernel memory, and that heap/vmalloc corruption is leverageable for kernel information disclosure, matching C:H for comparable V4L2 out-of-bounds writes.\nI:H - This is an out-of-bounds write of attacker-controlled pixel bytes (0xff remapped to 0xfe) of coded_w*coded_h bytes (at least 640x360) past the capture buffer, a classic kernel memory-corruption primitive suitable for control-flow hijacking.\nA:H - Writing hundreds of kilobytes past the allocated capture plane hits a vmalloc guard page or corrupts neighbouring objects, producing a kernel oops or panic that an unprivileged user can re-trigger at will."}]}],"providerMetadata":{"shortName":"Linux","orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","dateUpdated":"2026-10-19T08:51:37.470Z"},"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.10.270"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"5.15.221"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.1.188"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.6.157"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.12.109"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"6.18.50"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"7.2.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.0","versionEndExcluding":"7.3"}]}]}],"x_generator":{"engine":"bippy-1.2.0"}}}}}