CVE-2026-89879 (GCVE-0-2026-89879)
Vulnerability from cvelistv5
Published
2026-09-16 10:31
Modified
2026-10-19 08:54
Severity ?
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: 38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7
Version: 38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7
Version: 38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7
Version: 38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7
Version: 38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7
Version: 38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7
Version: 38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7
Version: 38f993ad8b1fe4caf9e989caf6e2a25aff3bbaf7
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{
  "containers": {
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          "product": "Linux",
          "programFiles": [
            "drivers/media/usb/s2255/s2255drv.c"
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      "cpeApplicability": [
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          "nodes": [
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:54:12.050Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/32a595dd3e8634544e5cfbc47f906dff3d3c1ef8"
        },
        {
          "url": "https://git.kernel.org/stable/c/4b6f7bccc6559ae5c54573c284fe76eafc9989b2"
        },
        {
          "url": "https://git.kernel.org/stable/c/2542516a147bfad740e7e411c251b639fad260ff"
        },
        {
          "url": "https://git.kernel.org/stable/c/79f58f900dd221ab04ea74bf4eaf79fa3b0fcc77"
        },
        {
          "url": "https://git.kernel.org/stable/c/d2ecaaab6a4f165abb54cdf61be60030b5782bf8"
        },
        {
          "url": "https://git.kernel.org/stable/c/68d664f1b4efe525e99154b7058fcb0378bdaff7"
        },
        {
          "url": "https://git.kernel.org/stable/c/dd739517560c8d0ec4463a53e717bf40b988d7da"
        },
        {
          "url": "https://git.kernel.org/stable/c/e504cc888f42999dd76b6a43788c422610f2aad2"
        }
      ],
      "title": "media: s2255: bound JPEG frame size before copying into the buffer",
      "x_generator": {
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89879",
    "datePublished": "2026-09-16T10:31:45.564Z",
    "dateReserved": "2026-09-11T19:38:34.772Z",
    "dateUpdated": "2026-10-19T08:54:12.050Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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