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vuln-cve/data/2021/47xxx/CVE-2021-47338.json
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{
"dataType": "CVE_RECORD",
"dataVersion": "5.2",
"cveMetadata": {
"cveId": "CVE-2021-47338",
"assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"state": "PUBLISHED",
"assignerShortName": "Linux",
"dateReserved": "2024-05-21T14:28:16.978Z",
"datePublished": "2024-05-21T14:35:47.028Z",
"dateUpdated": "2026-08-05T08:47:17.872Z"
},
"containers": {
"cna": {
"providerMetadata": {
"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
"shortName": "Linux",
"dateUpdated": "2026-08-05T08:47:17.872Z"
},
"descriptions": [
{
"lang": "en",
"value": "In the Linux kernel, the following vulnerability has been resolved:\n\nfbmem: Do not delete the mode that is still in use\n\nThe execution of fb_delete_videomode() is not based on the result of the\nprevious fbcon_mode_deleted(). As a result, the mode is directly deleted,\nregardless of whether it is still in use, which may cause UAF.\n\n==================================================================\nBUG: KASAN: use-after-free in fb_mode_is_equal+0x36e/0x5e0 \\\ndrivers/video/fbdev/core/modedb.c:924\nRead of size 4 at addr ffff88807e0ddb1c by task syz-executor.0/18962\n\nCPU: 2 PID: 18962 Comm: syz-executor.0 Not tainted 5.10.45-rc1+ #3\nHardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ...\nCall Trace:\n __dump_stack lib/dump_stack.c:77 [inline]\n dump_stack+0x137/0x1be lib/dump_stack.c:118\n print_address_description+0x6c/0x640 mm/kasan/report.c:385\n __kasan_report mm/kasan/report.c:545 [inline]\n kasan_report+0x13d/0x1e0 mm/kasan/report.c:562\n fb_mode_is_equal+0x36e/0x5e0 drivers/video/fbdev/core/modedb.c:924\n fbcon_mode_deleted+0x16a/0x220 drivers/video/fbdev/core/fbcon.c:2746\n fb_set_var+0x1e1/0xdb0 drivers/video/fbdev/core/fbmem.c:975\n do_fb_ioctl+0x4d9/0x6e0 drivers/video/fbdev/core/fbmem.c:1108\n vfs_ioctl fs/ioctl.c:48 [inline]\n __do_sys_ioctl fs/ioctl.c:753 [inline]\n __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739\n do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46\n entry_SYSCALL_64_after_hwframe+0x44/0xa9\n\nFreed by task 18960:\n kasan_save_stack mm/kasan/common.c:48 [inline]\n kasan_set_track+0x3d/0x70 mm/kasan/common.c:56\n kasan_set_free_info+0x17/0x30 mm/kasan/generic.c:355\n __kasan_slab_free+0x108/0x140 mm/kasan/common.c:422\n slab_free_hook mm/slub.c:1541 [inline]\n slab_free_freelist_hook+0xd6/0x1a0 mm/slub.c:1574\n slab_free mm/slub.c:3139 [inline]\n kfree+0xca/0x3d0 mm/slub.c:4121\n fb_delete_videomode+0x56a/0x820 drivers/video/fbdev/core/modedb.c:1104\n fb_set_var+0x1f3/0xdb0 drivers/video/fbdev/core/fbmem.c:978\n do_fb_ioctl+0x4d9/0x6e0 drivers/video/fbdev/core/fbmem.c:1108\n vfs_ioctl fs/ioctl.c:48 [inline]\n __do_sys_ioctl fs/ioctl.c:753 [inline]\n __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739\n do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46\n entry_SYSCALL_64_after_hwframe+0x44/0xa9"
}
],
"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 - Triggered via local ioctl(FBIOPUT_VSCREENINFO) on /dev/fbN through do_fb_ioctl → fb_set_var; there is no network or adjacent-protocol path into fbmem/fbcon.\nAC:L - The attacker fully controls mode setup and FB_ACTIVATE_INV_MODE deletion; ignoring fbcon_mode_deleted()'s in-use result deterministically frees a modelist entry while fb_display[].mode still points at it, with no attacker-independent race or layout requirement.\nPR:L - do_fb_ioctl/FBIOPUT_VSCREENINFO performs no capability check; access is only DAC on /dev/fbN, which seated users, video-group members, and embedded/Android graphics processes commonly have without init-namespace root.\nUI:N - The attacker opens the framebuffer device and issues the ioctl sequence directly; no separate victim action is required.\nS:U - Impact is kernel heap use-after-free and potential privilege escalation within the same host security authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - This is a use-after-free of a groomable kmalloc fb_modelist object whose dangling mode pointer is later read (e.g. fb_mode_is_equal/display_to_var), enabling heap disclosure per UAF scoring guidance.\nI:H - UAF of a sprayable slab object allows reclaim/type confusion and corruption of kernel state through subsequent fbcon/fb_set_var paths, enabling write primitives and control-flow hijack.\nA:H - The syzkaller/KASAN report is a slab use-after-free that oopses in fb_mode_is_equal(); dereferencing the dangling pointer after reclaim or page return can panic the kernel."
}
]
}
],
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"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
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],
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"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
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"lessThanOrEqual": "5.10.*",
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{
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{
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"lessThanOrEqual": "5.13.*",
"status": "unaffected",
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},
{
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"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
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"cpeApplicability": [
{
"nodes": [
{
"operator": "OR",
"negate": false,
"cpeMatch": [
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{
"url": "https://git.kernel.org/stable/c/0af778269a522c988ef0b4188556aba97fb420cc"
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"title": "fbmem: Do not delete the mode that is still in use",
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"type": "ssvc",
"content": {
"timestamp": "2024-06-12T15:00:51.209603Z",
"id": "CVE-2021-47338",
"options": [
{
"Exploitation": "none"
},
{
"Automatable": "no"
},
{
"Technical Impact": "partial"
}
],
"role": "CISA Coordinator",
"version": "2.0.3"
}
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],
"title": "CISA ADP Vulnrichment",
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"shortName": "CVE",
"dateUpdated": "2024-08-04T05:32:08.605Z"
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"title": "CVE Program Container",
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