CVE-2026-74320

What the bug is

The code that gets the frame buffer mode from OF has 'use after free', 'buffer overrun' and memory leaks. info->edid_data isn't free if the probe functions fail or if pd->def_mode is set. If both the CRT and PANEL are enabled info->edid_data is used after being freed and is freed twice. The string returned by of_get_property(np, "mode", &len) is just written over either the static "640x480-16@60" or the module parameter string without any regard for the length (which is most likely longer). Use kstrump() for the OF mode and free everything before freeing 'info.

Where it lives

The fix touches these files. If the subsystem is one you do not use, the practical exposure is lower, though the package is still the vulnerable one.

drivers/video/fbdev/sm501fb.c

What this is

FRAMEBUFFER LAYERMAINTAINERS section matched on drivers/video/ · linux-fbdev@vger.kernel.org · Maintained

Kernel module

none to look for. The file would have gone into sm501fb, and Debian does not compile it into that module, so finding sm501fb in lsmod would say nothing about this CVE.

Check it on the machine

grep -w CONFIG_FB_SM501 /boot/config-$(uname -r)

Reads the booted kernel's own configuration, on the machine and nowhere else. =y is built in, =m is a module, and an is not set line means the code is not there.

Show whether Debian builds this, per release

Debian does not build this code. In 4 releases below, every kernel flavour Debian publishes has the switch off, so the vulnerable file is compiled into no kernel binary Debian ships.

• bookworm, trixie, forky, sidn

n

not enabled on any flavour - this release does not build the code

Build switch

CONFIG_FB_SM501

From the configuration Debian publishes for every kernel flavour it builds. It covers only the architectures Debian ships a linux-config package for, and nothing about a kernel you built yourself. Debian's own status above stays authoritative about the source package.MAINTAINERS kbuild Makefiles Debian linux-config packages

Signals

Published

2026-08-15 (2 months ago)source

CVSS

no vector published, unrated

Attack vector

not published

EPSS

0.22%, higher than 11.6% of all CVEssource

CISA KEV

not listedthe KEV catalogue

Debian urgency

not yet assignedsource

Subsystem

drivers/video

Upstream fixes

The versions the CNA records as introducing and fixing this, and the commit for each. source

Introduced	Fixed in	Commit
2.6.39	5.10.261	0bc3d909a49e
2.6.39	5.15.212	47008d59c60e
2.6.39	6.1.178	d374f76e1257
2.6.39	6.6.145	b2ff450f7f5c
2.6.39	6.12.97	9057e3f5db39
2.6.39	6.18.40	de590cdf7efe
2.6.39	7.1.5	48cf0f4c6581
2.6.39	7.2	d8421e09382c