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CVE-2026-98612

net: usb: catc: bound the RX packet length in catc_rx_done()

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: net: usb: catc: bound the RX packet length in catc_rx_done() catc_rx_done() walks a multi-packet URB, reading a two-byte length from each packet header. Its bound, pkt_len > urb->actual_length, ignores the header offset and compares against the whole transfer rather than the bytes left from pkt_start, so a crafted packet header makes skb_copy_to_linear_data() read past the buffer. A length below ETH_HLEN is also accepted, including zero, and eth_type_trans() then reads a MAC header from the uninitialised tailroom of a shorter skb. The is_f5u011 branch takes its length straight from the transfer, so a zero-length URB reaches the same path. Track the bytes remaining from the current packet, and reject a header that does not fit, a length past what is left, and a length below an Ethernet header. A transfer shorter than an Ethernet header, including a zero-length one, previously became a runt skb passed to netif_rx() and counted as received; it is now counted in rx_length_errors and ends the walk.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 3942557938f846e7481f6ccb2b41ccbdee61baa1; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 2f87bbd5a7bf6ee79d598f7e22cf77810d29ae87; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 4cc0a8eb2f9336cfa3e4ac329bc5585ca970ced3; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 21e206dd88b3de6e36bb607dec3797c59bc3007b; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 801e21cf7dd6bcee31db907625d5045f21c9c1d9; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in dd9c6f8f05170223edec2dac476606cd40d9acb7; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 9d4be026bdff2c1da7b6c7e01c0a47f2df409e97; From 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 · fixed in 9d565b6b72fe3f41fd43636e143072848105189f

  • Linux Linux

    2.6.12

  • KernelLinux

    From 2.6.12 · fixed in 5.10.271; From 5.11.0 · fixed in 5.15.222; From 5.16.0 · fixed in 6.1.189; From 6.2.0 · fixed in 6.6.158; From 6.7.0 · fixed in 6.12.112; From 6.13.0 · fixed in 6.18.55; From 6.19.0 · fixed in 7.2.9

References 8

git.kernel.org