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vuln-cve/data/2021/47xxx/CVE-2021-47383.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
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"cveId": "CVE-2021-47383",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-05-21T14:58:30.812Z",
"datePublished": "2024-05-21T15:03:44.286Z",
"dateUpdated": "2026-08-05T08:47:33.469Z"
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"value": "In the Linux kernel, the following vulnerability has been resolved:\n\ntty: Fix out-of-bound vmalloc access in imageblit\n\nThis issue happens when a userspace program does an ioctl\nFBIOPUT_VSCREENINFO passing the fb_var_screeninfo struct\ncontaining only the fields xres, yres, and bits_per_pixel\nwith values.\n\nIf this struct is the same as the previous ioctl, the\nvc_resize() detects it and doesn't call the resize_screen(),\nleaving the fb_var_screeninfo incomplete. And this leads to\nthe updatescrollmode() calculates a wrong value to\nfbcon_display->vrows, which makes the real_y() return a\nwrong value of y, and that value, eventually, causes\nthe imageblit to access an out-of-bound address value.\n\nTo solve this issue I made the resize_screen() be called\neven if the screen does not need any resizing, so it will\n\"fix and fill\" the fb_var_screeninfo independently."
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"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"
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"value": "AV:L - The bug is triggered by a local FBIOPUT_VSCREENINFO ioctl on /dev/fbN that flows through fb_set_var → fbcon_modechanged → vc_do_resize → updatescrollmode → imageblit; it is not reachable via network or adjacent protocols.\nAC:L - A crafted incomplete fb_var_screeninfo (undersized/zero virtual resolution) deterministically drives negative fbcon_display->vrows and an OOB imageblit write; syzkaller has a reliable C repro with no race or attacker-independent conditions.\nPR:L - do_fb_ioctl/FBIOPUT_VSCREENINFO performs no capability check; access only requires opening /dev/fbN, which seated users, video-group members, and embedded/Android graphics processes commonly have without real root in the init namespace.\nUI:N - The attacker opens the framebuffer device and issues the ioctl directly; fbcon_modechanged calls update_screen on the same path, so no separate victim action is required.\nS:U - Impact is kernel memory corruption and crash within the same host security authority; it does not cross a VM, IOMMU, or other distinct boundary.\nC:H - The defect is kernel memory corruption via a vmalloc out-of-bounds access in imageblit; per guidance, such corruption can be leveraged for information disclosure and is scored High when uncertain.\nI:H - Syzbot confirms a KASAN vmalloc-out-of-bounds Write in fast_imageblit/sys_imageblit past screen_base; out-of-bounds writes are scored High because they enable memory corruption and potential control-flow hijacking.\nA:H - The out-of-bounds kernel write can oops/panic the kernel (and does under KASAN), which is a high availability impact."
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