CVE-2023-54277

fbdev: udlfb: Fix endpoint check

State: Published
Severity: Not scored
Published: Dec 30, 2025
Updated: May 23, 2026
Reserved: Dec 30, 2025

Description

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: <TASK> 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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	f6db63819db632158647d5bbf4d7d2d90dc1a268 to before 1522dc58bff87af79461b96d90ec122e9e726004Affected c4fb41bdf4d6ccca850c4af5d707d14a0fb717a7 to before 58ecc165abdaed85447455e6dc396758e8c6f219Affected 4df1584738f1dc6f0dd854d258bba48591f1ed0e to before 9e12c58a5ece41be72157cef348576b135c9fc72Affected aaf7dbe07385e0b8deb7237eca2a79926bbc7091 to before c8fdf7feca77cd99e25ef0a1e9e72dfc83add8efAffected aaf7dbe07385e0b8deb7237eca2a79926bbc7091 to before e19383e5dee5adbf3d19f3f210f440a88d1b7ddeAffected aaf7dbe07385e0b8deb7237eca2a79926bbc7091 to before ed9de4ed39875706607fb08118a58344ae6c5f42Affected 895ea8a290ba87850bcaf2ecfcddef75a014fa54Affected 5.4.192 to before 5.4.244Affected 5.10.114 to before 5.10.181Affected 5.15.38 to before 5.15.114Affected 5.17.6 to before 5.18Affected
LinuxLinux	5.18Affected before 5.18Not affected 5.4.244 through 5.4.Not affected 5.10.181 through 5.10.Not affected 5.15.114 through 5.15.Not affected 6.1.31 through 6.1.Not affected 6.3.5 through 6.3.*Not affected 6.4 and laterNot affected

Product

Versions

LinuxLinux

f6db63819db632158647d5bbf4d7d2d90dc1a268 to before 1522dc58bff87af79461b96d90ec122e9e726004Affected
c4fb41bdf4d6ccca850c4af5d707d14a0fb717a7 to before 58ecc165abdaed85447455e6dc396758e8c6f219Affected
4df1584738f1dc6f0dd854d258bba48591f1ed0e to before 9e12c58a5ece41be72157cef348576b135c9fc72Affected
aaf7dbe07385e0b8deb7237eca2a79926bbc7091 to before c8fdf7feca77cd99e25ef0a1e9e72dfc83add8efAffected
aaf7dbe07385e0b8deb7237eca2a79926bbc7091 to before e19383e5dee5adbf3d19f3f210f440a88d1b7ddeAffected
aaf7dbe07385e0b8deb7237eca2a79926bbc7091 to before ed9de4ed39875706607fb08118a58344ae6c5f42Affected
895ea8a290ba87850bcaf2ecfcddef75a014fa54Affected
5.4.192 to before 5.4.244Affected
5.10.114 to before 5.10.181Affected
5.15.38 to before 5.15.114Affected
5.17.6 to before 5.18Affected

LinuxLinux

5.18Affected
before 5.18Not affected
5.4.244 through 5.4.*Not affected
5.10.181 through 5.10.*Not affected
5.15.114 through 5.15.*Not affected
6.1.31 through 6.1.*Not affected
6.3.5 through 6.3.*Not affected
6.4 and laterNot affected

References

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