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CVE-2026-80827

USB: serial: option: fix slab OOB read in interrupt URB callback

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.269, 5.15.220, 6.1.187, 6.6.156, 6.12.108, and 3 more
None on Exploit-DB, Metasploit or GitHub

Summary

In the Linux kernel, the following vulnerability has been resolved: USB: serial: option: fix slab OOB read in interrupt URB callback The interrupt URB buffer is allocated in setup_port_interrupt_in() based on the endpoint's wMaxPacketSize: buffer_size = usb_endpoint_maxp(epd); port->interrupt_in_buffer = kmalloc(buffer_size, GFP_KERNEL); When a USB device declares wMaxPacketSize = 8 on its interrupt IN endpoint, the buffer is allocated from kmalloc-8 cache (exactly 8 bytes). If the device sends a short packet (actual_length < wMaxPacketSize), the URB completes with status == 0 and the callback proceeds to read: data[sizeof(struct usb_ctrlrequest)] which evaluates to data[8], accessing 1 byte beyond the allocated 8-byte buffer. This results in a slab out-of-bounds read. Fix this by adding the missing bounds check: first verify that the actual length is large enough to contain the struct usb_ctrlrequest header before accessing req_pkt->bRequestType and req_pkt->bRequest, and then verify that there is an additional byte for the modem signal state before reading data[sizeof(struct usb_ctrlrequest)] inside the conditional. Use sizeof(*req_pkt) instead of sizeof(struct usb_ctrlrequest) for consistency. [ johan: use dev_err(); split signals declaration and initialisation ]

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From 58cfe9113e485f7e04bd0eac4fc4251b330af501 · fixed in fbe60fd2abc8a5561f39719a41ad9a01b5d8e567; From 58cfe9113e485f7e04bd0eac4fc4251b330af501 · fixed in 94e5525697b9e91ddc4071129874120a50a4f342; From 58cfe9113e485f7e04bd0eac4fc4251b330af501 · fixed in 6b8cf5422c7e96ed5b22a8368eff663f3f98b8ec; From 58cfe9113e485f7e04bd0eac4fc4251b330af501 · fixed in 030e3a73d3c3aa67c44454649e984d6383cdb7d3; From 58cfe9113e485f7e04bd0eac4fc4251b330af501 · fixed in 060db7d48af1e650643c8b8319111a9ea2ce4486; From 58cfe9113e485f7e04bd0eac4fc4251b330af501 · fixed in 2ef5560387f2c0713cee975be2b24b281bd90f3e; From 58cfe9113e485f7e04bd0eac4fc4251b330af501 · fixed in a72a13c83a652516a0e469d275b81d29a7429049; From 58cfe9113e485f7e04bd0eac4fc4251b330af501 · fixed in d762aef4eba354066be21a5d88eb2066e282f4c9; From 58cfe9113e485f7e04bd0eac4fc4251b330af501 · fixed in 885d802f544ca7bfa8f3984d94233cce715bb6b3

  • Linux Linux

    2.6.12

  • KernelLinux

    From 2.6.12 · fixed in 5.10.269; From 5.11.0 · fixed in 5.15.220; From 5.16.0 · fixed in 6.1.187; From 6.2.0 · fixed in 6.6.156; From 6.7.0 · fixed in 6.12.108; From 6.13.0 · fixed in 6.18.49; From 6.19.0 · fixed in 7.1.13; From 7.2.0 · fixed in 7.2.3

References 9

git.kernel.org