Description
In the Linux kernel, the following vulnerability has been resolved: USB: serial: cypress_m8: validate interrupt packet headers cypress_read_int_callback() parses the interrupt-in buffer according to the selected Cypress packet format. Format 1 has a two-byte status/count header and format 2 has a one-byte combined status/count header. The usb-serial core sizes the interrupt-in buffer from the endpoint descriptor's wMaxPacketSize, and successful interrupt transfers can complete short when URB_SHORT_NOT_OK is not set. Check that the completed packet contains the selected header before reading it. Malformed short reports are ignored and the interrupt URB is resubmitted through the existing retry path, preventing out-of-bounds header-byte reads. KASAN report as below: KASAN slab-out-of-bounds in cypress_read_int_callback+0x240/0x7f0 Read of size 1 Call trace: cypress_read_int_callback() (drivers/usb/serial/cypress_m8.c:1009) __usb_hcd_giveback_urb() dummy_timer() [ johan: use constants in header length sanity checks ]
Affected products
linux: linux kernel
References8
- git.kernel.org/stable/c/44f9bab8df7750a1e2a4d6cc22d7c9c2dc096aed Patch
- git.kernel.org/stable/c/4a4cb0021ebe1fcadb52e04d19ed8d71470a530b Patch
- git.kernel.org/stable/c/90664556916de22467097d4c8ceb716d597a5c32 Patch
- git.kernel.org/stable/c/9f9bfc80c67f35a275820da7e83a35dface08281 Patch
- git.kernel.org/stable/c/aaa66708bfb1dca2acd219d1c1582f9f6d5492cb Patch
- git.kernel.org/stable/c/ae03453f2c809ca3cf73753269fa6184dea7160f Patch
- git.kernel.org/stable/c/be50533fe7068e86eb7adb81988e6d6a3f6dfe53 Patch
- git.kernel.org/stable/c/fcef31a5a85ccf3c313449a866ec6ed7e4132425 Patch
Metrics
- CVSS 3.1
-
7.1
HIGH
Score source: NVD
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H - EPSS — exploit probability
- 0% percentile: 7 · as of 14 November 2026
- CWE
- CWE-125
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