Bug 2461478 (CVE-2026-31623) - CVE-2026-31623 kernel: net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()
Summary: CVE-2026-31623 kernel: net: usb: cdc-phonet: fix skb frags[] overflow in rx_c...
Keywords:
Status: NEW
Alias: CVE-2026-31623
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
high
high
Target Milestone: ---
Assignee: Product Security
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-04-24 15:03 UTC by OSIDB Bzimport
Modified: 2026-04-24 20:26 UTC (History)
2 users (show)

Fixed In Version:
Clone Of:
Environment:
Last Closed:
Embargoed:


Attachments (Terms of Use)

Description OSIDB Bzimport 2026-04-24 15:03:51 UTC
In the Linux kernel, the following vulnerability has been resolved:

net: usb: cdc-phonet: fix skb frags[] overflow in rx_complete()

A malicious USB device claiming to be a CDC Phonet modem can overflow
the skb_shared_info->frags[] array by sending an unbounded sequence of
full-page bulk transfers.

Drop the skb and increment the length error when the frag limit is
reached.  This matches the same fix that commit f0813bcd2d9d ("net:
wwan: t7xx: fix potential skb->frags overflow in RX path") did for the
t7xx driver.


Note You need to log in before you can comment on or make changes to this bug.