GHSA-W8VH-2WXG-FRPG

Vulnerability from github – Published: 2026-09-16 12:30 – Updated: 2026-09-16 12:30
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

media: s2255: bound JPEG frame size before copying into the buffer

s2255_fillbuff() memcpy()s vc->jpg_size bytes of a captured JPEG/MJPEG frame into the vb2 plane. vc->jpg_size is taken verbatim from the S2255_MARKER_FRAME header the device sends (pdword[4] in save_frame()) and, unlike the frame payload length just above it, is never bounded:

payload = le32_to_cpu(pdword[3]);
if (payload > vc->req_image_size)   /* payload is checked ... */
    return -EINVAL;
vc->pkt_size = payload;
vc->jpg_size = le32_to_cpu(pdword[4]);  /* ... jpg_size is not */

A malicious or malfunctioning device can therefore report a jpg_size larger than the destination vb2 plane, and the memcpy() writes past it. jpg_size is a signed int, so a value with the top bit set also turns into a huge length.

Reject a frame whose jpg_size is negative or exceeds the plane size before copying it.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-89879"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-09-16T11:16:56Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmedia: s2255: bound JPEG frame size before copying into the buffer\n\ns2255_fillbuff() memcpy()s vc-\u003ejpg_size bytes of a captured JPEG/MJPEG\nframe into the vb2 plane.  vc-\u003ejpg_size is taken verbatim from the\nS2255_MARKER_FRAME header the device sends (pdword[4] in save_frame())\nand, unlike the frame payload length just above it, is never bounded:\n\n\tpayload = le32_to_cpu(pdword[3]);\n\tif (payload \u003e vc-\u003ereq_image_size)\t/* payload is checked ... */\n\t\treturn -EINVAL;\n\tvc-\u003epkt_size = payload;\n\tvc-\u003ejpg_size = le32_to_cpu(pdword[4]);\t/* ... jpg_size is not */\n\nA malicious or malfunctioning device can therefore report a jpg_size\nlarger than the destination vb2 plane, and the memcpy() writes past it.\njpg_size is a signed int, so a value with the top bit set also turns\ninto a huge length.\n\nReject a frame whose jpg_size is negative or exceeds the plane size\nbefore copying it.",
  "id": "GHSA-w8vh-2wxg-frpg",
  "modified": "2026-09-16T12:30:40Z",
  "published": "2026-09-16T12:30:39Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-89879"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2542516a147bfad740e7e411c251b639fad260ff"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/32a595dd3e8634544e5cfbc47f906dff3d3c1ef8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4b6f7bccc6559ae5c54573c284fe76eafc9989b2"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/68d664f1b4efe525e99154b7058fcb0378bdaff7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/79f58f900dd221ab04ea74bf4eaf79fa3b0fcc77"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d2ecaaab6a4f165abb54cdf61be60030b5782bf8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/dd739517560c8d0ec4463a53e717bf40b988d7da"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e504cc888f42999dd76b6a43788c422610f2aad2"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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