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In the Linux kernel, the following vulnerability has been resolved:
cifs: fix double free race when mount fails in cifs_get_root()
When cifs_get_root() fails during cifs_smb3_do_mount() we call deactivate_locked_super() which eventually will call delayed_free() which will free the context. In this situation we should not proceed to enter the out: section in cifs_smb3_do_mount() and free the same resources a second time.
[Thu Feb 10 12:59:06 2022] BUG: KASAN: use-after-free in rcu_cblist_dequeue+0x32/0x60 [Thu Feb 10 12:59:06 2022] Read of size 8 at addr ffff888364f4d110 by task swapper/1/0
[Thu Feb 10 12:59:06 2022] CPU: 1 PID: 0 Comm: swapper/1 Tainted: G OE 5.17.0-rc3+ #4 [Thu Feb 10 12:59:06 2022] Hardware name: Microsoft Corporation Virtual Machine/Virtual Machine, BIOS Hyper-V UEFI Release v4.0 12/17/2019 [Thu Feb 10 12:59:06 2022] Call Trace: [Thu Feb 10 12:59:06 2022] <IRQ> [Thu Feb 10 12:59:06 2022] dump_stack_lvl+0x5d/0x78 [Thu Feb 10 12:59:06 2022] print_address_description.constprop.0+0x24/0x150 [Thu Feb 10 12:59:06 2022] ? rcu_cblist_dequeue+0x32/0x60 [Thu Feb 10 12:59:06 2022] kasan_report.cold+0x7d/0x117 [Thu Feb 10 12:59:06 2022] ? rcu_cblist_dequeue+0x32/0x60 [Thu Feb 10 12:59:06 2022] __asan_load8+0x86/0xa0 [Thu Feb 10 12:59:06 2022] rcu_cblist_dequeue+0x32/0x60 [Thu Feb 10 12:59:06 2022] rcu_core+0x547/0xca0 [Thu Feb 10 12:59:06 2022] ? call_rcu+0x3c0/0x3c0 [Thu Feb 10 12:59:06 2022] ? __this_cpu_preempt_check+0x13/0x20 [Thu Feb 10 12:59:06 2022] ? lock_is_held_type+0xea/0x140 [Thu Feb 10 12:59:06 2022] rcu_core_si+0xe/0x10 [Thu Feb 10 12:59:06 2022] __do_softirq+0x1d4/0x67b [Thu Feb 10 12:59:06 2022] __irq_exit_rcu+0x100/0x150 [Thu Feb 10 12:59:06 2022] irq_exit_rcu+0xe/0x30 [Thu Feb 10 12:59:06 2022] sysvec_hyperv_stimer0+0x9d/0xc0 ... [Thu Feb 10 12:59:07 2022] Freed by task 58179: [Thu Feb 10 12:59:07 2022] kasan_save_stack+0x26/0x50 [Thu Feb 10 12:59:07 2022] kasan_set_track+0x25/0x30 [Thu Feb 10 12:59:07 2022] kasan_set_free_info+0x24/0x40 [Thu Feb 10 12:59:07 2022] ____kasan_slab_free+0x137/0x170 [Thu Feb 10 12:59:07 2022] __kasan_slab_free+0x12/0x20 [Thu Feb 10 12:59:07 2022] slab_free_freelist_hook+0xb3/0x1d0 [Thu Feb 10 12:59:07 2022] kfree+0xcd/0x520 [Thu Feb 10 12:59:07 2022] cifs_smb3_do_mount+0x149/0xbe0 [cifs] [Thu Feb 10 12:59:07 2022] smb3_get_tree+0x1a0/0x2e0 [cifs] [Thu Feb 10 12:59:07 2022] vfs_get_tree+0x52/0x140 [Thu Feb 10 12:59:07 2022] path_mount+0x635/0x10c0 [Thu Feb 10 12:59:07 2022] __x64_sys_mount+0x1bf/0x210 [Thu Feb 10 12:59:07 2022] do_syscall_64+0x5c/0xc0 [Thu Feb 10 12:59:07 2022] entry_SYSCALL_64_after_hwframe+0x44/0xae
[Thu Feb 10 12:59:07 2022] Last potentially related work creation: [Thu Feb 10 12:59:07 2022] kasan_save_stack+0x26/0x50 [Thu Feb 10 12:59:07 2022] __kasan_record_aux_stack+0xb6/0xc0 [Thu Feb 10 12:59:07 2022] kasan_record_aux_stack_noalloc+0xb/0x10 [Thu Feb 10 12:59:07 2022] call_rcu+0x76/0x3c0 [Thu Feb 10 12:59:07 2022] cifs_umount+0xce/0xe0 [cifs] [Thu Feb 10 12:59:07 2022] cifs_kill_sb+0xc8/0xe0 [cifs] [Thu Feb 10 12:59:07 2022] deactivate_locked_super+0x5d/0xd0 [Thu Feb 10 12:59:07 2022] cifs_smb3_do_mount+0xab9/0xbe0 [cifs] [Thu Feb 10 12:59:07 2022] smb3_get_tree+0x1a0/0x2e0 [cifs] [Thu Feb 10 12:59:07 2022] vfs_get_tree+0x52/0x140 [Thu Feb 10 12:59:07 2022] path_mount+0x635/0x10c0 [Thu Feb 10 12:59:07 2022] __x64_sys_mount+0x1bf/0x210 [Thu Feb 10 12:59:07 2022] do_syscall_64+0x5c/0xc0 [Thu Feb 10 12:59:07 2022] entry_SYSCALL_64_after_hwframe+0x44/0xae
| Product | Vendor Advisory | Solution File | Added | Published |
|---|---|---|---|---|
| Alma_linux | — | Upgrade kernel-debug-coreUpgrade kernel-rt-debug-develUpgrade kernel-headersUpgrade kernel-zfcpdump-develUpgrade kernel-zfcpdumpUpgrade kernel-debug-develUpgrade kernel-coreUpgrade kernel-rt-debug-modulesUpgrade kernel-modules-extraUpgrade kernel-abi-stablelistsUpgrade kernel-rt-debug-modules-extraUpgrade kernel-rt-coreUpgrade kernel-debugUpgrade kernel-modulesUpgrade python3-perfUpgrade kernel-zfcpdump-modules-extraUpgrade perfUpgrade kernel-docUpgrade kernel-zfcpdump-coreUpgrade kernel-cross-headersUpgrade kernel-debug-modulesUpgrade kernel-rt-modulesUpgrade kernel-rt-debug-coreUpgrade kernel-debug-modules-extraUpgrade kernel-rt-develUpgrade kernel-rtUpgrade kernel-rt-debugUpgrade kernel-rt-modules-extraUpgrade kernel-develUpgrade kernelUpgrade kernel-zfcpdump-modulesUpgrade kernel-tools-libsUpgrade kernel-toolsUpgrade bpftoolUpgrade kernel-tools-libs-devel | Jul 1, 2025 | Aug 22, 2024 |
| Amazon Linux Ami 2 | — | Upgrade kernel-develUpgrade bpftoolUpgrade kernel-tools-debuginfoUpgrade kernel-debuginfo-common-aarch64Upgrade kernel-livepatch-5.10.106-102.504Upgrade kernel-tools-develUpgrade perf-debuginfoUpgrade kernel-toolsUpgrade perfUpgrade bpftool-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade python-perfUpgrade kernel-livepatch-4.14.273-207.502Upgrade kernelUpgrade kernel-headersUpgrade kernel-debuginfoUpgrade python-perf-debuginfo | Sep 16, 2024 | Aug 22, 2024 |
| Debian | — | Upgrade linux | Aug 23, 2024 | Aug 22, 2024 |
| Dell Powerstore Dsa2025086 | — | Upgrade Dell PowerStoreOS to the latest version | Oct 23, 2025 | Feb 20, 2025 |
| Oracle_linux | — | Upgrade kernel | Jun 30, 2025 | Aug 22, 2024 |
| Redhat_linux | — | Upgrade kernelNo solution existsUpgrade kernel-rt | Jun 26, 2025 | Aug 22, 2024 |
| Rocky_linux | — | Upgrade kernel-debug-debuginfoUpgrade kernel-headersUpgrade bpftoolUpgrade kernel-rt-debug-coreUpgrade kernel-rt-debuginfoUpgrade python3-perf-debuginfoUpgrade kernel-debuginfo-common-x86_64Upgrade kernel-tools-libsUpgrade kernel-rt-debug-modulesUpgrade kernel-cross-headersUpgrade kernel-rt-debug-kvmUpgrade kernel-rt-modules-extraUpgrade kernel-modulesUpgrade kernelUpgrade kernel-debug-coreUpgrade kernel-rt-debuginfo-common-x86_64Upgrade bpftool-debuginfoUpgrade kernel-debug-modules-extraUpgrade kernel-modules-extraUpgrade kernel-rtUpgrade kernel-rt-debug-debuginfoUpgrade kernel-coreUpgrade kernel-debug-modulesUpgrade kernel-debuginfoUpgrade kernel-rt-debug-modules-extraUpgrade python3-perfUpgrade kernel-debugUpgrade kernel-rt-kvmUpgrade kernel-debug-develUpgrade kernel-tools-debuginfoUpgrade kernel-rt-debug-develUpgrade kernel-rt-develUpgrade perf-debuginfoUpgrade kernel-rt-debugUpgrade kernel-toolsUpgrade kernel-rt-modulesUpgrade kernel-rt-coreUpgrade kernel-tools-libs-develUpgrade perfUpgrade kernel-devel | Jul 31, 2025 | Jul 29, 2025 |
| Ubuntu | — | Upgrade linux-intel-iotg-5.15Upgrade linux-gkeop | Nov 19, 2024 | Aug 22, 2024 |
| Vmware Photon_os | — | Use 'tdnf update' to upgrade all packages to the latest version. | May 27, 2026 | Aug 22, 2024 |
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