{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2022-50097", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2025-06-18T10:57:27.411Z", "datePublished": "2025-06-18T11:02:34.589Z", "dateUpdated": "2026-08-05T08:57:23.864Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-05T08:57:23.864Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nvideo: fbdev: s3fb: Check the size of screen before memset_io()\n\nIn the function s3fb_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[ 54.083733] BUG: unable to handle page fault for address: ffffc90003000000\n[ 54.083742] #PF: supervisor write access in kernel mode\n[ 54.083744] #PF: error_code(0x0002) - not-present page\n[ 54.083760] RIP: 0010:memset_orig+0x33/0xb0\n[ 54.083782] Call Trace:\n[ 54.083788] s3fb_set_par+0x1ec6/0x4040\n[ 54.083806] fb_set_var+0x604/0xeb0\n[ 54.083836] do_fb_ioctl+0x234/0x670\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:N/I:H/A:H", "baseScore": 7.1, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:L - The bug is triggered through the local fbdev ioctl path (open /dev/fbN, FBIOPUT_VSCREENINFO → do_fb_ioctl → fb_set_var → s3fb_set_par), not via network or adjacent protocols.\nAC:L - An attacker who can issue FBIOPUT_VSCREENINFO reliably controls xres_virtual/yres_virtual/bits_per_pixel to bypass s3fb_check_var (signed int mem overflow or bpp==0 text mode) and force an oversized memset_io; no race or external conditions are required.\nPR:L - There is no CAP_SYS_ADMIN check on FBIOPUT_VSCREENINFO; access is only gated by /dev/fbN DAC permissions (typically root:video 0660), so an unprivileged video-group user can reach the vulnerable code.\nUI:N - Exploitation requires only the attacker's own open/ioctl against the framebuffer device; no separate victim action is needed.\nS:U - This is a standard in-kernel driver memory-safety bug affecting the host kernel/device; it does not cross a VM, IOMMU, or other security authority boundary.\nC:N - The corruption is a memset_io of fixed zeros into the PCI framebuffer aperture (and past it into unmapped ioremap space); there is no out-of-bounds read or other information-disclosure primitive.\nI:H - User-controlled dimensions cause an out-of-bounds write via memset_io beyond info->screen_size into the mapped BAR (and beyond), which is kernel-mediated memory corruption of framebuffer/MMIO space.\nA:H - The demonstrated result is a kernel page-fault oops in memset when the write runs past the ioremap'd region, which can panic or otherwise take down the system." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/video/fbdev/s3fb.c" ], "versions": [ { "version": "a268422de8bf1b4c0cb97987b6c329c9f6a3da4b", "lessThan": "574912261528589012b61f82d368256247c3a5a8", "status": "affected", "versionType": "git" }, { "version": "a268422de8bf1b4c0cb97987b6c329c9f6a3da4b", "lessThan": "3c35a0dc2b4e7acf24c796043b64fa3eee799239", "status": "affected", "versionType": "git" }, { "version": "a268422de8bf1b4c0cb97987b6c329c9f6a3da4b", "lessThan": "eacb50f1733660911827d7c3720f4c5425d0cdda", "status": "affected", "versionType": "git" }, { "version": "a268422de8bf1b4c0cb97987b6c329c9f6a3da4b", "lessThan": "5e0da18956d38e7106664dc1d06367b22f06edd3", "status": "affected", "versionType": "git" }, { "version": "a268422de8bf1b4c0cb97987b6c329c9f6a3da4b", "lessThan": "ce50d94afcb8690813c5522f24cd38737657db81", "status": "affected", "versionType": "git" }, { "version": "a268422de8bf1b4c0cb97987b6c329c9f6a3da4b", "lessThan": "52461d387cc8c8f8dc40320caa2e9e101f73e7ba", "status": "affected", "versionType": "git" }, { "version": "a268422de8bf1b4c0cb97987b6c329c9f6a3da4b", "lessThan": "e2d7cacc6a2a1d77e7e20a492daf458a12cf19e0", "status": "affected", "versionType": "git" }, { "version": "a268422de8bf1b4c0cb97987b6c329c9f6a3da4b", "lessThan": "6ba592fa014f21f35a8ee8da4ca7b95a018f13e8", "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/s3fb.c" ], "versions": [ { "version": "2.6.21", "status": "affected" }, { "version": "0", "lessThan": "2.6.21", "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": "2.6.21", "versionEndExcluding": "4.14.291" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "4.19.256" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "5.4.211" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "5.10.137" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "5.15.61" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "5.18.18" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "5.19.2" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.21", "versionEndExcluding": "6.0" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/574912261528589012b61f82d368256247c3a5a8" }, { "url": "https://git.kernel.org/stable/c/3c35a0dc2b4e7acf24c796043b64fa3eee799239" }, { "url": "https://git.kernel.org/stable/c/eacb50f1733660911827d7c3720f4c5425d0cdda" }, { "url": "https://git.kernel.org/stable/c/5e0da18956d38e7106664dc1d06367b22f06edd3" }, { "url": "https://git.kernel.org/stable/c/ce50d94afcb8690813c5522f24cd38737657db81" }, { "url": "https://git.kernel.org/stable/c/52461d387cc8c8f8dc40320caa2e9e101f73e7ba" }, { "url": "https://git.kernel.org/stable/c/e2d7cacc6a2a1d77e7e20a492daf458a12cf19e0" }, { "url": "https://git.kernel.org/stable/c/6ba592fa014f21f35a8ee8da4ca7b95a018f13e8" } ], "title": "video: fbdev: s3fb: Check the size of screen before memset_io()", "x_generator": { "engine": "bippy-1.2.0" } } } }