media: vicodec: fix out-of-bounds write in FWHT encoder

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89724
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:20:02 UTC
Updated2026-09-11 20:20:02 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: media: vicodec: fix out-of-bounds write in FWHT encoder vidioc_s_fmt_vid_out() sizes the encoder CAPTURE buffer from the compressed descriptor pixfmt_fwht, whose sizeimage_mult is 3: coded_w * coded_h * 3 + sizeof(struct fwht_cframe_hdr). fwht_encode_frame() encodes one plane per component, and an incompressible plane takes the FWHT_FRAME_UNENCODED path in encode_plane(), copying the plane verbatim. For a 4-component pixel format all four planes are full resolution (width_div == height_div == 1), so a frame that forces every plane through the unencoded fallback writes sizeof(struct fwht_cframe_hdr) + 4 * coded_w * coded_h bytes, overrunning the plane by coded_w * coded_h, which can result in corruption of adjacent kernel heap memory. Bump pixfmt_fwht.sizeimage_mult from 3 to 4, matching the largest components_num among the supported raw formats, so the capture buffer is always large enough for the unencoded fallback.

Risk And Classification

EPSS: 0.002000000 probability, percentile 0.099700000 (date 2026-09-12)

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 16ecf6dff97ce0194a7126e26159492668d47a7e 84cfebf7f4229d748cca8eb9c4e1f1c4099d3ab7 git Not specified
CNA Linux Linux affected 16ecf6dff97ce0194a7126e26159492668d47a7e 8c14472431e27f13661d0db9d837156eaced0ecb git Not specified
CNA Linux Linux affected 16ecf6dff97ce0194a7126e26159492668d47a7e b95315ffc66b39856396c1043618bb4e4d5785ba git Not specified
CNA Linux Linux affected 16ecf6dff97ce0194a7126e26159492668d47a7e cf4500ebf6fb57bf4ab83c3dd349a40257dbe2a9 git Not specified
CNA Linux Linux affected 5.0 Not specified
CNA Linux Linux unaffected 5.0 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/b95315ffc66b39856396c1043618bb4e4d5785ba 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/84cfebf7f4229d748cca8eb9c4e1f1c4099d3ab7 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cf4500ebf6fb57bf4ab83c3dd349a40257dbe2a9 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/8c14472431e27f13661d0db9d837156eaced0ecb 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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