{"id":"CVE-2026-89879","published":"2026-09-16T11:16:56.230","lastModified":"2026-09-16T11:16:56.230","description":"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->jpg_size bytes of a captured JPEG/MJPEG\nframe into the vb2 plane.  vc->jpg_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 > vc->req_image_size)\t/* payload is checked ... */\n\t\treturn -EINVAL;\n\tvc->pkt_size = payload;\n\tvc->jpg_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.","cvssScore":null,"cvssSeverity":null,"cvssVector":null,"cwes":[],"vendors":[],"products":[],"references":[{"url":"https://git.kernel.org/stable/c/2542516a147bfad740e7e411c251b639fad260ff","tags":[]},{"url":"https://git.kernel.org/stable/c/32a595dd3e8634544e5cfbc47f906dff3d3c1ef8","tags":[]},{"url":"https://git.kernel.org/stable/c/4b6f7bccc6559ae5c54573c284fe76eafc9989b2","tags":[]},{"url":"https://git.kernel.org/stable/c/68d664f1b4efe525e99154b7058fcb0378bdaff7","tags":[]},{"url":"https://git.kernel.org/stable/c/79f58f900dd221ab04ea74bf4eaf79fa3b0fcc77","tags":[]},{"url":"https://git.kernel.org/stable/c/d2ecaaab6a4f165abb54cdf61be60030b5782bf8","tags":[]},{"url":"https://git.kernel.org/stable/c/dd739517560c8d0ec4463a53e717bf40b988d7da","tags":[]},{"url":"https://git.kernel.org/stable/c/e504cc888f42999dd76b6a43788c422610f2aad2","tags":[]}],"exploitRefs":[],"hasPoc":false,"ai":null}