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Vulnerability · Published Aug 22, 2024 · Assigned by Linux

CVE-2022-48919cifs: fix double free race when mount fails in cifs_get_root()

High 8.8

In plain English

A high-severity security flaw in Linux from Linux. There are no confirmed reports of exploitation so far. The chance it is exploited in the next 30 days is estimated at 0.5% (higher than 41% of all known vulnerabilities). Fixed versions are available - upgrade the affected package.

Severity (CVSS 3.1)8.8High
Exploit odds (30 days)0.5%top 59.3% of all CVEs
Exploited in the wildNo reportsCISA SSVC: none
Attack toolingNoneno public tooling known

Official description

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

Affected packages & fixed versions

EcosystemPackageFixed inAdvisory
AlmaLinux:8bpftool4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-abi-stablelists4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-core4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-cross-headers4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-debug4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-debug-core4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-debug-devel4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-debug-modules4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-debug-modules-extra4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-devel4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-doc4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-headers4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-modules4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-modules-extra4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-rt4.18.0-553.58.1.rt7.399.el8_10ALSA-2025:9581
AlmaLinux:8kernel-rt-core4.18.0-553.58.1.rt7.399.el8_10ALSA-2025:9581
AlmaLinux:8kernel-rt-debug4.18.0-553.58.1.rt7.399.el8_10ALSA-2025:9581
AlmaLinux:8kernel-rt-debug-core4.18.0-553.58.1.rt7.399.el8_10ALSA-2025:9581
AlmaLinux:8kernel-rt-debug-devel4.18.0-553.58.1.rt7.399.el8_10ALSA-2025:9581
AlmaLinux:8kernel-rt-debug-modules4.18.0-553.58.1.rt7.399.el8_10ALSA-2025:9581
AlmaLinux:8kernel-rt-debug-modules-extra4.18.0-553.58.1.rt7.399.el8_10ALSA-2025:9581
AlmaLinux:8kernel-rt-devel4.18.0-553.58.1.rt7.399.el8_10ALSA-2025:9581
AlmaLinux:8kernel-rt-modules4.18.0-553.58.1.rt7.399.el8_10ALSA-2025:9581
AlmaLinux:8kernel-rt-modules-extra4.18.0-553.58.1.rt7.399.el8_10ALSA-2025:9581
AlmaLinux:8kernel-tools4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-tools-libs4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-tools-libs-devel4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-zfcpdump4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-zfcpdump-core4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-zfcpdump-devel4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-zfcpdump-modules4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8kernel-zfcpdump-modules-extra4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8perf4.18.0-553.58.1.el8_10ALSA-2025:9580
AlmaLinux:8python3-perf4.18.0-553.58.1.el8_10ALSA-2025:9580
Debian:12linux5.16.14-1DEBIAN-CVE-2022-48919
Debian:13linux5.16.14-1DEBIAN-CVE-2022-48919
Debian:14linux5.16.14-1DEBIAN-CVE-2022-48919
Rocky Linux:8kernel0:4.18.0-553.58.1.el8_10RLSA-2025:9580
Rocky Linux:8kernel-rt0:4.18.0-553.58.1.rt7.399.el8_10RLSA-2025:9581
Ubuntu:22.04:LTSlinux-allwinner-5.19no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-aws-5.19no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-aws-6.2no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-aws-6.5no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-azure-5.19no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-azure-6.2no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-azure-6.5no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-azure-fde-5.19no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-azure-fde-6.2no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-gcp-5.19no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-gcp-6.2no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-gcp-6.5no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-hwe-5.19no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-hwe-6.2no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-hwe-6.5no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-intel-iot-realtimeno fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-lowlatency-hwe-5.19no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.2no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-lowlatency-hwe-6.5no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-nvidia-6.2no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-oem-5.17no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-oem-6.0no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-oem-6.1no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-oem-6.5no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-oracle-6.5no fix listedUBUNTU-CVE-2022-48919
Ubuntu:24.04:LTSlinux-raspi-realtimeno fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-realtimeno fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-riscvno fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-riscv-5.19no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-riscv-6.5no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-starfive-5.19no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-starfive-6.2no fix listedUBUNTU-CVE-2022-48919
Ubuntu:22.04:LTSlinux-starfive-6.5no fix listedUBUNTU-CVE-2022-48919

Affected products (as reported)

VendorProductVersions
Linux Linux d17abdf7566566fc402c31899b353044a7ff3cf4 – before 546d60859ecf13380fcabcbeace53a5971493a2bd17abdf7566566fc402c31899b353044a7ff3cf4 – before 563431c1f3c8f2230e4a9c445fa23758742bc4f0d17abdf7566566fc402c31899b353044a7ff3cf4 – before 3d6cc9898efdfb062efb74dc18cfc700e082f5d5
Linux Linux 5.11

References