CVE-2023-54277

published 2025-12-30

CVE-2023-54277: In the Linux kernel, the following vulnerability has been resolved: fbdev: udlfb: Fix endpoint check The syzbot fuzzer detected a problem in the udlfb driver…

Priority P4 21

In the Linux kernel, the following vulnerability has been resolved:

fbdev: udlfb: Fix endpoint check

The syzbot fuzzer detected a problem in the udlfb driver, caused by an
endpoint not having the expected type:

usb 1-1: Read EDID byte 0 failed: -71
usb 1-1: Unable to get valid EDID from device/display
------------[ cut here ]------------
usb 1-1: BOGUS urb xfer, pipe 3 != type 1
WARNING: CPU: 0 PID: 9 at drivers/usb/core/urb.c:504 usb_submit_urb+0xed6/0x1880
drivers/usb/core/urb.c:504
Modules linked in:
CPU: 0 PID: 9 Comm: kworker/0:1 Not tainted
6.4.0-rc1-syzkaller-00016-ga4422ff22142 #0
Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google
04/28/2023
Workqueue: usb_hub_wq hub_event
RIP: 0010:usb_submit_urb+0xed6/0x1880 drivers/usb/core/urb.c:504
...
Call Trace:

dlfb_submit_urb+0x92/0x180 drivers/video/fbdev/udlfb.c:1980
dlfb_set_video_mode+0x21f0/0x2950 drivers/video/fbdev/udlfb.c:315
dlfb_ops_set_par+0x2a7/0x8d0 drivers/video/fbdev/udlfb.c:1111
dlfb_usb_probe+0x149a/0x2710 drivers/video/fbdev/udlfb.c:1743

The current approach for this issue failed to catch the problem
because it only checks for the existence of a bulk-OUT endpoint; it
doesn't check whether this endpoint is the one that the driver will
actually use.

We can fix the problem by instead checking that the endpoint used by
the driver does exist and is bulk-OUT.

Affected

22 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.37-1 (bookworm)	linux 6.1.37-1 (bookworm)
linux	linux	—	—
linux	linux	—	—
linux	linux	>= 4df1584738f1dc6f0dd854d258bba48591f1ed0e < 9e12c58a5ece41be72157cef348576b135c9fc72	9e12c58a5ece41be72157cef348576b135c9fc72
linux	linux	>= 5.10.114 < 5.10.181	5.10.181
linux	linux	>= 5.15.38 < 5.15.114	5.15.114
linux	linux	>= 5.17.6 < 5.18	5.18
linux	linux	>= 5.4.192 < 5.4.244	5.4.244
linux	linux	>= aaf7dbe07385e0b8deb7237eca2a79926bbc7091 < c8fdf7feca77cd99e25ef0a1e9e72dfc83add8ef	c8fdf7feca77cd99e25ef0a1e9e72dfc83add8ef
linux	linux	>= aaf7dbe07385e0b8deb7237eca2a79926bbc7091 < e19383e5dee5adbf3d19f3f210f440a88d1b7dde	e19383e5dee5adbf3d19f3f210f440a88d1b7dde
linux	linux	>= aaf7dbe07385e0b8deb7237eca2a79926bbc7091 < ed9de4ed39875706607fb08118a58344ae6c5f42	ed9de4ed39875706607fb08118a58344ae6c5f42
linux	linux	>= c4fb41bdf4d6ccca850c4af5d707d14a0fb717a7 < 58ecc165abdaed85447455e6dc396758e8c6f219	58ecc165abdaed85447455e6dc396758e8c6f219
linux	linux	>= f6db63819db632158647d5bbf4d7d2d90dc1a268 < 1522dc58bff87af79461b96d90ec122e9e726004	1522dc58bff87af79461b96d90ec122e9e726004
linux	linux_kernel	>= 0 < 5.10.191-1	5.10.191-1
linux	linux_kernel	>= 0 < 6.1.37-1	6.1.37-1
linux	linux_kernel	>= 0 < 6.3.7-1	6.3.7-1
linux	linux_kernel	>= 0 < 6.3.7-1	6.3.7-1
linux	linux_kernel	>= 0 < 5.4.244	5.4.244
linux	linux_kernel	>= 5.11.0 < 5.15.114	5.15.114
linux	linux_kernel	>= 5.16.0 < 6.1.31	6.1.31
linux	linux_kernel	>= 5.18.0 < 6.3.5	6.3.5
linux	linux_kernel	>= 5.5.0 < 5.10.181	5.10.181

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