264 lines
14 KiB
JSON
264 lines
14 KiB
JSON
{
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"dataType": "CVE_RECORD",
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"dataVersion": "5.2",
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"cveMetadata": {
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"cveId": "CVE-2022-50101",
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"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"state": "PUBLISHED",
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"assignerShortName": "Linux",
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"dateReserved": "2025-06-18T10:57:27.412Z",
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"datePublished": "2025-06-18T11:02:37.297Z",
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"dateUpdated": "2026-08-05T08:57:27.086Z"
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},
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"containers": {
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"cna": {
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"providerMetadata": {
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"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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"shortName": "Linux",
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"dateUpdated": "2026-08-05T08:57:27.086Z"
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},
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"descriptions": [
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{
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"lang": "en",
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"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()."
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}
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],
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"metrics": [
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{
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"cvssV3_1": {
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"version": "3.1",
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"vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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"baseScore": 7.8,
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"baseSeverity": "HIGH"
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},
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"scenarios": [
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{
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"lang": "en",
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"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."
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}
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]
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}
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],
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"affected": [
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "unaffected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/video/fbdev/vt8623fb.c"
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],
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"versions": [
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{
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"version": "558b7bd86c32978648cda5deb5c758d77ef0c165",
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"lessThan": "73280a184aa2e1a625ce54ce761042955cc79cd0",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "558b7bd86c32978648cda5deb5c758d77ef0c165",
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"lessThan": "52ad9bfeb8a0e62de30de6d39e8a49a72dd78150",
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"status": "affected",
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},
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{
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"lessThan": "d71528ccdc7ae8d7500d414091d27805c51407a2",
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"status": "affected",
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"lessThan": "bd8269e57621e5b38cc0b4bd2fa02e85c9f2a441",
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"status": "affected",
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},
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{
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"version": "558b7bd86c32978648cda5deb5c758d77ef0c165",
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"lessThan": "4a3cef1eaced13ba9b55381d46bfad937a3dac2c",
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"status": "affected",
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},
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{
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"version": "558b7bd86c32978648cda5deb5c758d77ef0c165",
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"lessThan": "b17caec5127bba6f90af92bcc85871df54548ac0",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "558b7bd86c32978648cda5deb5c758d77ef0c165",
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"lessThan": "c7a3f41e4b133d4dd25bc996b69039b19a34d69d",
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"status": "affected",
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"versionType": "git"
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},
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{
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"version": "558b7bd86c32978648cda5deb5c758d77ef0c165",
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"lessThan": "ec0754c60217248fa77cc9005d66b2b55200ac06",
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"status": "affected",
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"versionType": "git"
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}
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]
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},
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{
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"product": "Linux",
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"vendor": "Linux",
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"defaultStatus": "affected",
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"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
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"programFiles": [
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"drivers/video/fbdev/vt8623fb.c"
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],
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"versions": [
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{
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"version": "2.6.22",
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"status": "affected"
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},
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{
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"version": "0",
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"lessThan": "2.6.22",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "4.14.291",
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"lessThanOrEqual": "4.14.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "4.19.256",
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"lessThanOrEqual": "4.19.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.4.211",
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"lessThanOrEqual": "5.4.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.10.137",
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"lessThanOrEqual": "5.10.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.15.61",
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"lessThanOrEqual": "5.15.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.18.18",
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"lessThanOrEqual": "5.18.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "5.19.2",
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"lessThanOrEqual": "5.19.*",
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"status": "unaffected",
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"versionType": "semver"
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},
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{
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"version": "6.0",
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"lessThanOrEqual": "*",
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"status": "unaffected",
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"versionType": "original_commit_for_fix"
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}
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]
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}
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],
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"cpeApplicability": [
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{
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"nodes": [
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{
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"operator": "OR",
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"negate": false,
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"cpeMatch": [
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"vulnerable": true,
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"criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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"versionStartIncluding": "2.6.22",
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"versionEndExcluding": "4.14.291"
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"references": [
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{
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"url": "https://git.kernel.org/stable/c/73280a184aa2e1a625ce54ce761042955cc79cd0"
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},
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{
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"url": "https://git.kernel.org/stable/c/52ad9bfeb8a0e62de30de6d39e8a49a72dd78150"
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},
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{
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"url": "https://git.kernel.org/stable/c/d71528ccdc7ae8d7500d414091d27805c51407a2"
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},
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{
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"url": "https://git.kernel.org/stable/c/bd8269e57621e5b38cc0b4bd2fa02e85c9f2a441"
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},
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{
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"url": "https://git.kernel.org/stable/c/4a3cef1eaced13ba9b55381d46bfad937a3dac2c"
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},
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{
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"url": "https://git.kernel.org/stable/c/b17caec5127bba6f90af92bcc85871df54548ac0"
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},
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{
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"url": "https://git.kernel.org/stable/c/c7a3f41e4b133d4dd25bc996b69039b19a34d69d"
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},
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{
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"url": "https://git.kernel.org/stable/c/ec0754c60217248fa77cc9005d66b2b55200ac06"
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}
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],
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"title": "video: fbdev: vt8623fb: Check the size of screen before memset_io()",
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"x_generator": {
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"engine": "bippy-1.2.0"
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}
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}
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}
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} |