{ "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" } } } }