{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89724", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.759Z", "datePublished": "2026-09-11T19:46:35.914Z", "dateUpdated": "2026-10-19T08:51:37.470Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:51:37.470Z" }, "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." } ], "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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/media/test-drivers/vicodec/vicodec-core.c" ], "versions": [ { "version": "16ecf6dff97ce0194a7126e26159492668d47a7e", "lessThan": "f7ae26c100a6c26c2a166d2c41e73188067b36bd", "status": "affected", "versionType": "git" }, { "version": "16ecf6dff97ce0194a7126e26159492668d47a7e", "lessThan": "6ea647e76c44387d5c1c635df4604c2154d9060e", "status": "affected", "versionType": "git" }, { "version": "16ecf6dff97ce0194a7126e26159492668d47a7e", "lessThan": "d40838a63f2bd6a3df0a6cdd8ff1d5c6366e8fff", "status": "affected", "versionType": "git" }, { "version": "16ecf6dff97ce0194a7126e26159492668d47a7e", "lessThan": "e21cccc29b840930cd9dcfdf1139658063a681af", "status": "affected", "versionType": "git" }, { "version": "16ecf6dff97ce0194a7126e26159492668d47a7e", "lessThan": "84cfebf7f4229d748cca8eb9c4e1f1c4099d3ab7", "status": "affected", "versionType": "git" }, { "version": "16ecf6dff97ce0194a7126e26159492668d47a7e", "lessThan": "8c14472431e27f13661d0db9d837156eaced0ecb", "status": "affected", "versionType": "git" }, { "version": "16ecf6dff97ce0194a7126e26159492668d47a7e", "lessThan": "b95315ffc66b39856396c1043618bb4e4d5785ba", "status": "affected", "versionType": "git" }, { "version": "16ecf6dff97ce0194a7126e26159492668d47a7e", "lessThan": "cf4500ebf6fb57bf4ab83c3dd349a40257dbe2a9", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/media/test-drivers/vicodec/vicodec-core.c" ], "versions": [ { "version": "5.0", "status": "affected" }, { "version": "0", "lessThan": "5.0", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "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" } ] } ] } ], "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" } ], "title": "media: vicodec: fix out-of-bounds write in FWHT encoder", "x_generator": { "engine": "bippy-1.2.0" } } } }