{"dataType":"CVE_RECORD","dataVersion":"5.2","cveMetadata":{"cveId":"CVE-2022-50101","assignerOrgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","state":"PUBLISHED","assignerShortName":"Linux","dateReserved":"2025-06-18T10:57:27.412Z","datePublished":"2025-06-18T11:02:37.297Z","dateUpdated":"2026-08-05T08:57:27.086Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-08-05T08:57:27.086Z"},"descriptions":[{"lang":"en","value":"In the Linux kernel, the following vulnerability has been resolved:\n\nvideo: fbdev: vt8623fb: Check the size of screen before memset_io()\n\nIn the function vt8623fb_set_par(), the value of 'screen_size' is\ncalculated by the user input. If the user provides the improper value,\nthe value of 'screen_size' may larger than 'info->screen_size', which\nmay cause the following bug:\n\n[  583.339036] BUG: unable to handle page fault for address: ffffc90005000000\n[  583.339049] #PF: supervisor write access in kernel mode\n[  583.339052] #PF: error_code(0x0002) - not-present page\n[  583.339074] RIP: 0010:memset_orig+0x33/0xb0\n[  583.339110] Call Trace:\n[  583.339118]  vt8623fb_set_par+0x11cd/0x21e0\n[  583.339146]  fb_set_var+0x604/0xeb0\n[  583.339181]  do_fb_ioctl+0x234/0x670\n[  583.339209]  fb_ioctl+0xdd/0x130\n\nFix the this by checking the value of 'screen_size' before memset_io()."}],"metrics":[{"cvssV3_1":{"version":"3.1","vectorString":"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H","baseScore":7.8,"baseSeverity":"HIGH"},"scenarios":[{"lang":"en","value":"AV:L - The bug is reached via the local FBIOPUT_VSCREENINFO ioctl on /dev/fb*, through do_fb_ioctl → fb_set_var → vt8623fb_set_par. It is not reachable from the network or adjacent protocols.\nAC:L - An attacker who can open the framebuffer device can reliably trigger the overflow by setting bits_per_pixel=0 (text mode) with a large xres_virtual*yres_virtual; check_var's memory check uses bpp and always computes mem=0 in text mode, so no race or uncontrolled condition is required.\nPR:L - There is no capability check on FBIOPUT_VSCREENINFO; access is gated only by /dev/fb* permissions (typically root:video 0660). An unprivileged local user in the video group or with seat/uaccess rights can open the device and invoke the ioctl.\nUI:N - Exploitation requires only issuing the ioctl from the attacker's own process; no victim action such as mounting a filesystem or opening a crafted file is needed.\nS:U - This is a standard in-kernel framebuffer driver bug that affects the host kernel authority only; it does not cross a VM, IOMMU, or other security boundary.\nC:H - The bug is a user-controlled out-of-bounds write via memset_io() past the mapped framebuffer. Per scoring guidance, memory-corruption primitives of this class are treated as enabling high confidentiality impact when exploitation is considered.\nI:H - memset_io() writes past info->screen_size into ioremapped framebuffer memory with an attacker-controlled length, which is an out-of-bounds write and is scored as high integrity impact.\nA:H - The demonstrated impact is a kernel page fault/oops in memset_io() when the write walks off the mapped region, which is a full availability compromise of the kernel."}]}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/video/fbdev/vt8623fb.c"],"versions":[{"version":"558b7bd86c32978648cda5deb5c758d77ef0c165","lessThan":"73280a184aa2e1a625ce54ce761042955cc79cd0","status":"affected","versionType":"git"},{"version":"558b7bd86c32978648cda5deb5c758d77ef0c165","lessThan":"52ad9bfeb8a0e62de30de6d39e8a49a72dd78150","status":"affected","versionType":"git"},{"version":"558b7bd86c32978648cda5deb5c758d77ef0c165","lessThan":"d71528ccdc7ae8d7500d414091d27805c51407a2","status":"affected","versionType":"git"},{"version":"558b7bd86c32978648cda5deb5c758d77ef0c165","lessThan":"bd8269e57621e5b38cc0b4bd2fa02e85c9f2a441","status":"affected","versionType":"git"},{"version":"558b7bd86c32978648cda5deb5c758d77ef0c165","lessThan":"4a3cef1eaced13ba9b55381d46bfad937a3dac2c","status":"affected","versionType":"git"},{"version":"558b7bd86c32978648cda5deb5c758d77ef0c165","lessThan":"b17caec5127bba6f90af92bcc85871df54548ac0","status":"affected","versionType":"git"},{"version":"558b7bd86c32978648cda5deb5c758d77ef0c165","lessThan":"c7a3f41e4b133d4dd25bc996b69039b19a34d69d","status":"affected","versionType":"git"},{"version":"558b7bd86c32978648cda5deb5c758d77ef0c165","lessThan":"ec0754c60217248fa77cc9005d66b2b55200ac06","status":"affected","versionType":"git"}]},{"product":"Linux","vendor":"Linux","defaultStatus":"affected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/video/fbdev/vt8623fb.c"],"versions":[{"version":"2.6.22","status":"affected"},{"version":"0","lessThan":"2.6.22","status":"unaffected","versionType":"semver"},{"version":"4.14.291","lessThanOrEqual":"4.14.*","status":"unaffected","versionType":"semver"},{"version":"4.19.256","lessThanOrEqual":"4.19.*","status":"unaffected","versionType":"semver"},{"version":"5.4.211","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.137","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.15.61","lessThanOrEqual":"5.15.*","status":"unaffected","versionType":"semver"},{"version":"5.18.18","lessThanOrEqual":"5.18.*","status":"unaffected","versionType":"semver"},{"version":"5.19.2","lessThanOrEqual":"5.19.*","status":"unaffected","versionType":"semver"},{"version":"6.0","lessThanOrEqual":"*","status":"unaffected","versionType":"original_commit_for_fix"}]}],"cpeApplicability":[{"nodes":[{"operator":"OR","negate":false,"cpeMatch":[{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"4.14.291"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"4.19.256"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"5.4.211"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"5.10.137"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"5.15.61"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"5.18.18"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"5.19.2"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"2.6.22","versionEndExcluding":"6.0"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/73280a184aa2e1a625ce54ce761042955cc79cd0"},{"url":"https://git.kernel.org/stable/c/52ad9bfeb8a0e62de30de6d39e8a49a72dd78150"},{"url":"https://git.kernel.org/stable/c/d71528ccdc7ae8d7500d414091d27805c51407a2"},{"url":"https://git.kernel.org/stable/c/bd8269e57621e5b38cc0b4bd2fa02e85c9f2a441"},{"url":"https://git.kernel.org/stable/c/4a3cef1eaced13ba9b55381d46bfad937a3dac2c"},{"url":"https://git.kernel.org/stable/c/b17caec5127bba6f90af92bcc85871df54548ac0"},{"url":"https://git.kernel.org/stable/c/c7a3f41e4b133d4dd25bc996b69039b19a34d69d"},{"url":"https://git.kernel.org/stable/c/ec0754c60217248fa77cc9005d66b2b55200ac06"}],"title":"video: fbdev: vt8623fb: Check the size of screen before memset_io()","x_generator":{"engine":"bippy-1.2.0"}}}}