{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50099", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-06-18T10:57:27.412Z", "datePublished": "2025-06-18T11:02:36.018Z", "dateUpdated": "2026-08-05T08:57:26.003Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:57:26.003Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvideo: fbdev: arkfb: Check the size of screen before memset_io()\n\nIn the function arkfb_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[ 659.399066] BUG: unable to handle page fault for address: ffffc90003000000\n[ 659.399077] #PF: supervisor write access in kernel mode\n[ 659.399079] #PF: error_code(0x0002) - not-present page\n[ 659.399094] RIP: 0010:memset_orig+0x33/0xb0\n[ 659.399116] Call Trace:\n[ 659.399122] arkfb_set_par+0x143f/0x24c0\n[ 659.399130] fb_set_var+0x604/0xeb0\n[ 659.399161] do_fb_ioctl+0x234/0x670\n[ 659.399189] 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 - Reachable only via local FBIOPUT_VSCREENINFO on /dev/fb* (ioctl → do_fb_ioctl → fb_set_var → arkfb_set_par); no network or adjacent-protocol path into arkfb.\nAC:L - An attacker who can open the device can reliably trigger the overflow with bits_per_pixel=0 (text mode) and large xres_virtual*yres_virtual; check_var's memory check uses bpp and always yields mem=0 in text mode, so no race or uncontrolled condition is required.\nPR:L - fb_open/FBIOPUT_VSCREENINFO have no capable() gate; access is only DAC on /dev/fbN (typically 660 root:video / seat ACL), which ordinary local graphics users hold—not real root.\nUI:N - The attacker opens /dev/fb* and issues FBIOPUT_VSCREENINFO themselves; no separate victim action is required.\nS:U - Impact is host-kernel memory corruption/oops in the same OS security authority as the fbdev driver; not a VM escape, IOMMU bypass, or other boundary cross.\nC:H - User-controlled out-of-bounds write via memset_io() past the mapped framebuffer is a memory-corruption primitive; per scoring guidance such primitives 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/arkfb.c" ], "versions": [ { "version": "681e14730c73cc2c71af282c001de6bc71c22f00", "lessThan": "4a20c5510aa2c031a096a58deb356e91609781c9", "status": "affected", "versionType": "git" }, { "version": "681e14730c73cc2c71af282c001de6bc71c22f00", "lessThan": "352305ea50d682b8e081d826da53caf9e744d7d0", "status": "affected", "versionType": "git" }, { "version": "681e14730c73cc2c71af282c001de6bc71c22f00", "lessThan": "53198b81930e567ad6b879812d88052a1e8ac79e", "status": "affected", "versionType": "git" }, { "version": "681e14730c73cc2c71af282c001de6bc71c22f00", "lessThan": "09e733d6ac948e6fda4b16252e44ea46f98fc8b4", "status": "affected", "versionType": "git" }, { "version": "681e14730c73cc2c71af282c001de6bc71c22f00", "lessThan": "0701df594bc1d7ae55fed407fb65dd90a93f8a9c", "status": "affected", "versionType": "git" }, { "version": "681e14730c73cc2c71af282c001de6bc71c22f00", "lessThan": "8bcb1a06e3091716b7cbebe0e91d1de9895068cd", "status": "affected", "versionType": "git" }, { "version": "681e14730c73cc2c71af282c001de6bc71c22f00", "lessThan": "2ce61c39c2a0b8ec82f48e0f7136f0dac105ae75", "status": "affected", "versionType": "git" }, { "version": "681e14730c73cc2c71af282c001de6bc71c22f00", "lessThan": "96b550971c65d54d64728d8ba973487878a06454", "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/arkfb.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/4a20c5510aa2c031a096a58deb356e91609781c9" }, { "url": "https://git.kernel.org/stable/c/352305ea50d682b8e081d826da53caf9e744d7d0" }, { "url": "https://git.kernel.org/stable/c/53198b81930e567ad6b879812d88052a1e8ac79e" }, { "url": "https://git.kernel.org/stable/c/09e733d6ac948e6fda4b16252e44ea46f98fc8b4" }, { "url": "https://git.kernel.org/stable/c/0701df594bc1d7ae55fed407fb65dd90a93f8a9c" }, { "url": "https://git.kernel.org/stable/c/8bcb1a06e3091716b7cbebe0e91d1de9895068cd" }, { "url": "https://git.kernel.org/stable/c/2ce61c39c2a0b8ec82f48e0f7136f0dac105ae75" }, { "url": "https://git.kernel.org/stable/c/96b550971c65d54d64728d8ba973487878a06454" } ], "title": "video: fbdev: arkfb: Check the size of screen before memset_io()", "x_generator": { "engine": "bippy-1.2.0" } } } }