CVE-2022-50010

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

State: Published
Severity: Not scored
Published: Jun 18, 2025
Updated: May 11, 2026
Reserved: Jun 18, 2025

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to before 59cefb583c984c0da8cf21a4c57d26d5a20dff5cAffected 5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to before 656689cb03ada4650016c153346939a1c334b1aeAffected 5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to before d2d375eb68b4b8de6ea7460483a26fa9de56b443Affected 5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to before 2b7f559152a33c55f51b569b22efbe5e24886798Affected 5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to before 4b20c61365140d432dee7da7aa294215e7b900d9Affected 5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to before e740e787f06671455b59d1e498c9945f7b4e7b3bAffected 5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to before f350812e2d15278f1d867eeb997407782234fb3cAffected 5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to before 40bf722f8064f50200b8c4f8946cd625b441dda9Affected
LinuxLinux	3.4Affected before 3.4Not affected 4.9.326 through 4.9.Not affected 4.14.291 through 4.14.Not affected 4.19.256 through 4.19.Not affected 5.4.211 through 5.4.Not affected 5.10.138 through 5.10.Not affected 5.15.63 through 5.15.Not affected 5.19.4 through 5.19.*Not affected 6.0 and laterNot affected

Product

Versions

LinuxLinux

5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to before 59cefb583c984c0da8cf21a4c57d26d5a20dff5cAffected
5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to before 656689cb03ada4650016c153346939a1c334b1aeAffected
5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to before d2d375eb68b4b8de6ea7460483a26fa9de56b443Affected
5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to before 2b7f559152a33c55f51b569b22efbe5e24886798Affected
5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to before 4b20c61365140d432dee7da7aa294215e7b900d9Affected
5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to before e740e787f06671455b59d1e498c9945f7b4e7b3bAffected
5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to before f350812e2d15278f1d867eeb997407782234fb3cAffected
5350c65f4f15bbc111ffa629130d3f32cdd4ccf6 to before 40bf722f8064f50200b8c4f8946cd625b441dda9Affected

LinuxLinux

3.4Affected
before 3.4Not affected
4.9.326 through 4.9.*Not affected
4.14.291 through 4.14.*Not affected
4.19.256 through 4.19.*Not affected
5.4.211 through 5.4.*Not affected
5.10.138 through 5.10.*Not affected
5.15.63 through 5.15.*Not affected
5.19.4 through 5.19.*Not affected
6.0 and laterNot affected

References

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