CVE-2022-50097

video: fbdev: s3fb: Check the size of screen before memset_io()

State: Published
Severity: 7.1 High
Published: Jun 18, 2025
Updated: Aug 5, 2026
Reserved: Jun 18, 2025

Description

In the Linux kernel, the following vulnerability has been resolved:

video: fbdev: s3fb: Check the size of screen before memset_io()

In the function s3fb_set_par(), the value of 'screen_size' is calculated by the user input. If the user provides the improper value, the value of 'screen_size' may larger than 'info->screen_size', which may cause the following bug:

[ 54.083733] BUG: unable to handle page fault for address: ffffc90003000000 [ 54.083742] #PF: supervisor write access in kernel mode [ 54.083744] #PF: error_code(0x0002) - not-present page [ 54.083760] RIP: 0010:memset_orig+0x33/0xb0 [ 54.083782] Call Trace: [ 54.083788] s3fb_set_par+0x1ec6/0x4040 [ 54.083806] fb_set_var+0x604/0xeb0 [ 54.083836] do_fb_ioctl+0x234/0x670

Fix the this by checking the value of 'screen_size' before memset_io().

Scores

CVSS	Score	Vector	Source
3.1	7.1 High	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:H/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	a268422de8bf1b4c0cb97987b6c329c9f6a3da4b to before 574912261528589012b61f82d368256247c3a5a8Affected a268422de8bf1b4c0cb97987b6c329c9f6a3da4b to before 3c35a0dc2b4e7acf24c796043b64fa3eee799239Affected a268422de8bf1b4c0cb97987b6c329c9f6a3da4b to before eacb50f1733660911827d7c3720f4c5425d0cddaAffected a268422de8bf1b4c0cb97987b6c329c9f6a3da4b to before 5e0da18956d38e7106664dc1d06367b22f06edd3Affected a268422de8bf1b4c0cb97987b6c329c9f6a3da4b to before ce50d94afcb8690813c5522f24cd38737657db81Affected a268422de8bf1b4c0cb97987b6c329c9f6a3da4b to before 52461d387cc8c8f8dc40320caa2e9e101f73e7baAffected a268422de8bf1b4c0cb97987b6c329c9f6a3da4b to before e2d7cacc6a2a1d77e7e20a492daf458a12cf19e0Affected a268422de8bf1b4c0cb97987b6c329c9f6a3da4b to before 6ba592fa014f21f35a8ee8da4ca7b95a018f13e8Affected
LinuxLinux	2.6.21Affected before 2.6.21Not 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 5.10.137 through 5.10.Not affected 5.15.61 through 5.15.Not affected 5.18.18 through 5.18.Not affected 5.19.2 through 5.19.*Not affected 6.0 and laterNot affected

Product

Versions

LinuxLinux

a268422de8bf1b4c0cb97987b6c329c9f6a3da4b to before 574912261528589012b61f82d368256247c3a5a8Affected
a268422de8bf1b4c0cb97987b6c329c9f6a3da4b to before 3c35a0dc2b4e7acf24c796043b64fa3eee799239Affected
a268422de8bf1b4c0cb97987b6c329c9f6a3da4b to before eacb50f1733660911827d7c3720f4c5425d0cddaAffected
a268422de8bf1b4c0cb97987b6c329c9f6a3da4b to before 5e0da18956d38e7106664dc1d06367b22f06edd3Affected
a268422de8bf1b4c0cb97987b6c329c9f6a3da4b to before ce50d94afcb8690813c5522f24cd38737657db81Affected
a268422de8bf1b4c0cb97987b6c329c9f6a3da4b to before 52461d387cc8c8f8dc40320caa2e9e101f73e7baAffected
a268422de8bf1b4c0cb97987b6c329c9f6a3da4b to before e2d7cacc6a2a1d77e7e20a492daf458a12cf19e0Affected
a268422de8bf1b4c0cb97987b6c329c9f6a3da4b to before 6ba592fa014f21f35a8ee8da4ca7b95a018f13e8Affected

LinuxLinux

2.6.21Affected
before 2.6.21Not 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
5.10.137 through 5.10.*Not affected
5.15.61 through 5.15.*Not affected
5.18.18 through 5.18.*Not affected
5.19.2 through 5.19.*Not affected
6.0 and laterNot affected

References

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