https://vulnerability.circl.lu/sightings/feed 2026-05-07T19:39:23.668598+00:00 Vulnerability-Lookup info@circl.lu python-feedgen Contains only the most 10 recent sightings. https://vulnerability.circl.lu/sighting/8be0eeb8-2e37-42a0-a452-9462e458c0bc/export 2026-05-07T19:39:24.028080+00:00 Automation user http://vulnerability.circl.lu/user/automation {"uuid": "8be0eeb8-2e37-42a0-a452-9462e458c0bc", "vulnerability_lookup_origin": "1a89b78e-f703-45f3-bb86-59eb712668bd", "author": "9f56dd64-161d-43a6-b9c3-555944290a09", "vulnerability": "CVE-2021-47338", "type": "published-proof-of-concept", "source": "https://t.me/DarkWebInformer_CVEAlerts/14730", "content": "\ud83d\udd17 DarkWebInformer.com - Cyber Threat Intelligence\n\ud83d\udccc CVE ID: CVE-2021-47338\n\ud83d\udd25 CVSS Score: N/A\n\ud83d\udd39 Description: 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\n\ud83d\udccf Published: 2024-05-21T14:35:47.028Z\n\ud83d\udccf Modified: 2025-05-04T07:08:55.555Z\n\ud83d\udd17 References:\n1. https://git.kernel.org/stable/c/359311b85ebec7c07c3a08ae2f3def946cad33fa\n2. https://git.kernel.org/stable/c/087bff9acd2ec6db3f61aceb3224bde90fe0f7f8\n3. https://git.kernel.org/stable/c/f193509afc7ff37a46862610c93b896044d5b693\n4. https://git.kernel.org/stable/c/d6e76469157d8f240e5dec6f8411aa8d306b1126\n5. https://git.kernel.org/stable/c/0af778269a522c988ef0b4188556aba97fb420cc", "creation_timestamp": "2025-05-04T07:18:10.000000Z"} 2025-05-04T07:18:10+00:00