CVE-2022-50010

video: fbdev: i740fb: Check the argument of i740_calc_vclk()

MEDIUM

5.5

CVSS Score

Published: June 18, 2025 at 11:01 AM UTC

Updated: June 17, 2026 at 05:22 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

MEDIUM5.5

Exploit prediction

EPSS 0.3%

Description

In the Linux kernel, the following vulnerability has been resolved: video: fbdev: i740fb: Check the argument of i740_calc_vclk() Since the user can control the arguments of the ioctl() from the user space, under special arguments that may result in a divide-by-zero bug. If the user provides an improper 'pixclock' value that makes the argumet of i740_calc_vclk() less than 'I740_RFREQ_FIX', it will cause a divide-by-zero bug in: drivers/video/fbdev/i740fb.c:353 p_best = min(15, ilog2(I740_MAX_VCO_FREQ / (freq / I740_RFREQ_FIX))); The following log can reveal it: divide error: 0000 [#1] PREEMPT SMP KASAN PTI RIP: 0010:i740_calc_vclk drivers/video/fbdev/i740fb.c:353 [inline] RIP: 0010:i740fb_decode_var drivers/video/fbdev/i740fb.c:646 [inline] RIP: 0010:i740fb_set_par+0x163f/0x3b70 drivers/video/fbdev/i740fb.c:742 Call Trace: fb_set_var+0x604/0xeb0 drivers/video/fbdev/core/fbmem.c:1034 do_fb_ioctl+0x234/0x670 drivers/video/fbdev/core/fbmem.c:1110 fb_ioctl+0xdd/0x130 drivers/video/fbdev/core/fbmem.c:1189 Fix this by checking the argument of i740_calc_vclk() first.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

v < 4.9.3263.4 ≤ v < 4.14.2913.4 ≤ v < 4.19.2563.4 ≤ v < 4.9.3263.4 ≤ v < 5.10.1383.4 ≤ v < 5.15.633.4 ≤ v < 5.19.43.4 ≤ v < 5.4.2113.4 ≤ v < 6.04.10 ≤ v < 4.14.2914.15 ≤ v < 4.19.2564.20 ≤ v < 5.4.2115.11 ≤ v < 5.15.635.16 ≤ v < 5.19.45.5 ≤ v < 5.10.1383.45350c65f4f15bbc111ffa629130d3f32cdd4ccf6

Vendor states this is fixed in 2b7f559152a33c55f51b569b22efbe5e24886798 (fixed)

Vendor states this is fixed in 40bf722f8064f50200b8c4f8946cd625b441dda9 (fixed)

Vendor states this is fixed in 4b20c61365140d432dee7da7aa294215e7b900d9 (fixed)

Vendor states this is fixed in 59cefb583c984c0da8cf21a4c57d26d5a20dff5c (fixed)

Vendor states this is fixed in 656689cb03ada4650016c153346939a1c334b1ae (fixed)

Vendor states this is fixed in d2d375eb68b4b8de6ea7460483a26fa9de56b443 (fixed)

Vendor states this is fixed in e740e787f06671455b59d1e498c9945f7b4e7b3b (fixed)

Vendor states this is fixed in f350812e2d15278f1d867eeb997407782234fb3c (fixed)

Vendor states this is fixed in 3.4 (unaffected)

Vendor states this is fixed in 4.14.291 (unaffected)

Vendor states this is fixed in 4.19.256 (unaffected)

Vendor states this is fixed in 4.9.326 (unaffected)