In the Linux kernel, the following vulnerability has been resolved:
fbmem: Do not delete the mode that is still in use
The execution of fb_delete_videomode() is not based on the result of the previous fbcon_mode_deleted(). As a result, the mode is directly deleted, regardless of whether it is still in use, which may cause UAF.
================================================================== BUG: KASAN: use-after-free in fb_mode_is_equal+0x36e/0x5e0 \ drivers/video/fbdev/core/modedb.c:924 Read of size 4 at addr ffff88807e0ddb1c by task syz-executor.0/18962
CPU: 2 PID: 18962 Comm: syz-executor.0 Not tainted 5.10.45-rc1+ #3 Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS ... Call Trace: __dump_stack lib/dump_stack.c:77 [inline] dump_stack+0x137/0x1be lib/dump_stack.c:118 print_address_description+0x6c/0x640 mm/kasan/report.c:385 __kasan_report mm/kasan/report.c:545 [inline] kasan_report+0x13d/0x1e0 mm/kasan/report.c:562 fb_mode_is_equal+0x36e/0x5e0 drivers/video/fbdev/core/modedb.c:924 fbcon_mode_deleted+0x16a/0x220 drivers/video/fbdev/core/fbcon.c:2746 fb_set_var+0x1e1/0xdb0 drivers/video/fbdev/core/fbmem.c:975 do_fb_ioctl+0x4d9/0x6e0 drivers/video/fbdev/core/fbmem.c:1108 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9
Freed by task 18960: kasan_save_stack mm/kasan/common.c:48 [inline] kasan_set_track+0x3d/0x70 mm/kasan/common.c:56 kasan_set_free_info+0x17/0x30 mm/kasan/generic.c:355 __kasan_slab_free+0x108/0x140 mm/kasan/common.c:422 slab_free_hook mm/slub.c:1541 [inline] slab_free_freelist_hook+0xd6/0x1a0 mm/slub.c:1574 slab_free mm/slub.c:3139 [inline] kfree+0xca/0x3d0 mm/slub.c:4121 fb_delete_videomode+0x56a/0x820 drivers/video/fbdev/core/modedb.c:1104 fb_set_var+0x1f3/0xdb0 drivers/video/fbdev/core/fbmem.c:978 do_fb_ioctl+0x4d9/0x6e0 drivers/video/fbdev/core/fbmem.c:1108 vfs_ioctl fs/ioctl.c:48 [inline] __do_sys_ioctl fs/ioctl.c:753 [inline] __se_sys_ioctl+0xfb/0x170 fs/ioctl.c:739 do_syscall_64+0x2d/0x70 arch/x86/entry/common.c:46 entry_SYSCALL_64_after_hwframe+0x44/0xa9
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade kernel-tools-libsUpgrade kernel-debug-modulesUpgrade kernel-rt-debug-coreUpgrade kernel-debug-modules-extraUpgrade bpftoolUpgrade kernel-rt-modules-extraUpgrade kernel-toolsUpgrade kernel-rt-develUpgrade kernel-rt-debugUpgrade kernel-cross-headersUpgrade kernel-tools-libs-develUpgrade kernel-zfcpdump-coreUpgrade kernel-rt-kvmUpgrade kernel-abi-stablelistsUpgrade kernel-rtUpgrade kernelUpgrade python3-perfUpgrade kernel-zfcpdump-modulesUpgrade kernel-rt-debug-kvmUpgrade kernel-debug-develUpgrade kernel-rt-modulesUpgrade kernel-headersUpgrade kernel-zfcpdump-develUpgrade kernel-zfcpdump-modules-extraUpgrade kernel-rt-debug-modulesUpgrade kernel-develUpgrade kernel-rt-debug-modules-extraUpgrade kernel-zfcpdumpUpgrade kernel-debugUpgrade kernel-rt-debug-develUpgrade kernel-docUpgrade perfUpgrade kernel-modulesUpgrade kernel-rt-coreUpgrade kernel-modules-extraUpgrade kernel-coreUpgrade kernel-debug-core | Sep 26, 2024 | May 21, 2024 |
| Amazon Linux Ami 2 | — | Upgrade kernel-debuginfoUpgrade kernel-develUpgrade bpftool-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade python-perfUpgrade kernel-tools-debuginfoUpgrade kernelUpgrade bpftoolUpgrade kernel-livepatch-5.10.59-52.142Upgrade perf-debuginfoUpgrade kernel-tools-develUpgrade python-perf-debuginfoUpgrade kernel-toolsUpgrade kernel-headersUpgrade perfUpgrade kernel-debuginfo-common-aarch64 | Dec 12, 2024 | May 21, 2024 |
| Debian | — | Upgrade linux | Jul 30, 2024 | May 21, 2024 |
| Oracle_linux | — | Upgrade kernel | Oct 16, 2024 | May 21, 2024 |
| Redhat_linux | — | Upgrade kernelUpgrade kernel-rt | Sep 25, 2024 | May 21, 2024 |
| Rocky_linux | — | Upgrade bpftoolUpgrade kernel-debug-develUpgrade kernel-debuginfoUpgrade kernel-rt-debuginfo-common-x86_64Upgrade kernel-rt-modules-extraUpgrade kernel-coreUpgrade perfUpgrade kernel-modulesUpgrade kernel-rt-develUpgrade kernel-rt-coreUpgrade kernel-rt-debugUpgrade kernel-modules-extraUpgrade python3-perfUpgrade kernel-develUpgrade kernel-debugUpgrade kernel-rt-debug-modules-extraUpgrade kernel-tools-libsUpgrade kernel-rt-kvmUpgrade kernel-tools-debuginfoUpgrade kernel-debug-coreUpgrade kernel-rt-debug-coreUpgrade python3-perf-debuginfoUpgrade kernel-rt-debug-debuginfoUpgrade kernel-rt-debug-modulesUpgrade kernel-tools-libs-develUpgrade kernel-debug-debuginfoUpgrade bpftool-debuginfoUpgrade kernel-debug-modules-extraUpgrade kernel-rt-debug-kvmUpgrade kernel-debug-modulesUpgrade kernel-rt-modulesUpgrade kernel-toolsUpgrade kernel-rtUpgrade perf-debuginfoUpgrade kernel-rt-debug-develUpgrade kernel-debuginfo-common-x86_64Upgrade kernelUpgrade kernel-rt-debuginfoUpgrade kernel-cross-headersUpgrade kernel-headers | Oct 2, 2024 | May 21, 2024 |
| Suse | — | Upgrade kernel-64kbUpgrade kernel-symsUpgrade kernel-docsUpgrade kernel-zfcpdumpUpgrade kernel-macrosUpgrade kernel-64kb-develUpgrade kernel-preemptUpgrade kernel-sourceUpgrade kernel-obs-buildUpgrade kernel-default-baseUpgrade kernel-defaultUpgrade kernel-preempt-develUpgrade reiserfs-kmp-defaultUpgrade kernel-develUpgrade kernel-default-devel | Aug 9, 2024 | May 21, 2024 |
| Ubuntu | — | Upgrade linuxUpgrade linux-gcp-5.4Upgrade linux-gcpUpgrade linux-oracle-5.4Upgrade linux-azure-fipsUpgrade linux-awsUpgrade linux-hwe-5.4Upgrade linux-ibmUpgrade linux-azureUpgrade linux-gcp-fipsUpgrade linux-aws-fipsUpgrade linux-raspiUpgrade linux-oracleUpgrade linux-fipsUpgrade linux-gkeopUpgrade linux-kvmUpgrade linux-bluefieldUpgrade linux-raspi-5.4Upgrade linux-aws-5.4Upgrade linux-azure-5.4 | Nov 19, 2024 | May 21, 2024 |
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