# CVE-2023-54277: linux: In the Linux kernel, the following vulnerability has been resolved:  fbdev: udlfb: Fix endpoint check  The syzbot fuz...

CVE-2023-54277 is fixed in linux on 1 platform, first by DEBIAN-CVE-2023-54277, released December 30, 2025. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2023-54277
- Priority: Routine
- CVSS: n/a
- EPSS: 0.0021
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: 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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.37-1 | [DEBIAN-CVE-2023-54277](https://patchblox.com/security/data/fix/linux/debian-cve-2023-54277.md) | Dec 30, 2025 |
| Linux | linux Debian 13.5 (trixie) | 6.3.7-1 | [DEBIAN-CVE-2023-54277](https://patchblox.com/security/data/fix/linux/debian-cve-2023-54277.md) | Dec 30, 2025 |
| Linux | linux Debian 14 | 6.3.7-1 | [DEBIAN-CVE-2023-54277](https://patchblox.com/security/data/fix/linux/debian-cve-2023-54277.md) | Dec 30, 2025 |

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Data as of 2026-11-09T01:18:40Z UTC. Source: Patchblox Patch Radar (https://patchblox.com/security/patch-radar). Patchblox finds out-of-date software on Windows, macOS and Linux and updates it through release rings: https://patchblox.com/demo

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