CVE-2026-89879
UnknownSummary
In the Linux kernel, the media s2255 driver's 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 sent by the device and is never bounded, allowing an out-of-bounds write.
Risk Assessment
A malicious or malfunctioning device can report a jpg_size larger than the destination vb2 plane, causing a buffer overflow and potential kernel code execution. jpg_size is a signed int, so a value with the top bit set also becomes a huge length.
Recommendation
Update the Linux kernel to a version that rejects a frame whose jpg_size is negative or exceeds the plane size before copying.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS