{"dataType":"CVE_RECORD","dataVersion":"5.1","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":"2025-05-04T07:08:55.555Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2025-05-04T07:08:55.555Z"},"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"}],"affected":[{"product":"Linux","vendor":"Linux","defaultStatus":"unaffected","repo":"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git","programFiles":["drivers/video/fbdev/core/fbmem.c"],"versions":[{"version":"13ff178ccd6d3b8074c542a911300b79c4eec255","lessThan":"359311b85ebec7c07c3a08ae2f3def946cad33fa","status":"affected","versionType":"git"},{"version":"13ff178ccd6d3b8074c542a911300b79c4eec255","lessThan":"087bff9acd2ec6db3f61aceb3224bde90fe0f7f8","status":"affected","versionType":"git"},{"version":"13ff178ccd6d3b8074c542a911300b79c4eec255","lessThan":"f193509afc7ff37a46862610c93b896044d5b693","status":"affected","versionType":"git"},{"version":"13ff178ccd6d3b8074c542a911300b79c4eec255","lessThan":"d6e76469157d8f240e5dec6f8411aa8d306b1126","status":"affected","versionType":"git"},{"version":"13ff178ccd6d3b8074c542a911300b79c4eec255","lessThan":"0af778269a522c988ef0b4188556aba97fb420cc","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/core/fbmem.c"],"versions":[{"version":"5.3","status":"affected"},{"version":"0","lessThan":"5.3","status":"unaffected","versionType":"semver"},{"version":"5.4.134","lessThanOrEqual":"5.4.*","status":"unaffected","versionType":"semver"},{"version":"5.10.52","lessThanOrEqual":"5.10.*","status":"unaffected","versionType":"semver"},{"version":"5.12.19","lessThanOrEqual":"5.12.*","status":"unaffected","versionType":"semver"},{"version":"5.13.4","lessThanOrEqual":"5.13.*","status":"unaffected","versionType":"semver"},{"version":"5.14","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":"5.3","versionEndExcluding":"5.4.134"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.10.52"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.12.19"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.13.4"},{"vulnerable":true,"criteria":"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*","versionStartIncluding":"5.3","versionEndExcluding":"5.14"}]}]}],"references":[{"url":"https://git.kernel.org/stable/c/359311b85ebec7c07c3a08ae2f3def946cad33fa"},{"url":"https://git.kernel.org/stable/c/087bff9acd2ec6db3f61aceb3224bde90fe0f7f8"},{"url":"https://git.kernel.org/stable/c/f193509afc7ff37a46862610c93b896044d5b693"},{"url":"https://git.kernel.org/stable/c/d6e76469157d8f240e5dec6f8411aa8d306b1126"},{"url":"https://git.kernel.org/stable/c/0af778269a522c988ef0b4188556aba97fb420cc"}],"title":"fbmem: Do not delete the mode that is still in use","x_generator":{"engine":"bippy-1.2.0"}},"adp":[{"metrics":[{"other":{"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"}}}],"title":"CISA ADP Vulnrichment","providerMetadata":{"orgId":"134c704f-9b21-4f2e-91b3-4a467353bcc0","shortName":"CISA-ADP","dateUpdated":"2024-06-12T15:01:02.502Z"}},{"providerMetadata":{"orgId":"af854a3a-2127-422b-91ae-364da2661108","shortName":"CVE","dateUpdated":"2024-08-04T05:32:08.605Z"},"title":"CVE Program Container","references":[{"url":"https://git.kernel.org/stable/c/359311b85ebec7c07c3a08ae2f3def946cad33fa","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/087bff9acd2ec6db3f61aceb3224bde90fe0f7f8","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/f193509afc7ff37a46862610c93b896044d5b693","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/d6e76469157d8f240e5dec6f8411aa8d306b1126","tags":["x_transferred"]},{"url":"https://git.kernel.org/stable/c/0af778269a522c988ef0b4188556aba97fb420cc","tags":["x_transferred"]}]}]}}