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

Quick assessment

Affected

Linux Linux

Exploitation

No confirmed in-the-wild exploitation; assess based on exposure

Recommended action

Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于在cifs_smb3_do_mount函数中的out:部分错误地释放相同资源。

CVSS 8.8 · High EPSS 0.47% · P39 Updated Aug 05, 2026

Possible ATT&CK Techniques 2 AI

T1068 · Exploitation for Privilege Escalation T1055 · Process Injection

Affected Version Matrix 8

Vendor	Product	Version Range	Status
Linux	Linux	`d17abdf7566566fc402c31899b353044a7ff3cf4< 546d60859ecf13380fcabcbeace53a5971493a2b`	affected
		`d17abdf7566566fc402c31899b353044a7ff3cf4< 563431c1f3c8f2230e4a9c445fa23758742bc4f0`	affected
		`d17abdf7566566fc402c31899b353044a7ff3cf4< 3d6cc9898efdfb062efb74dc18cfc700e082f5d5`	affected
		`5.11`	affected
		`< 5.11`	unaffected
		`5.15.27≤ 5.15.*`	unaffected
		`5.16.13≤ 5.16.*`	unaffected
		`5.17≤ *`	unaffected

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I. Basic Information for CVE-2022-48919

Vulnerability Information

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Vulnerability Title

cifs: fix double free race when mount fails in cifs_get_root()

Source: CVE Program / CVE List V5

Vulnerability 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

Source: CVE Program / CVE List V5

CVSS Information

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Source: CVE Program / CVE List V5

Vulnerability Type

N/A

Source: CVE Program / CVE List V5

Vulnerability Title

Linux kernel 安全漏洞

Source: CNNVD (China National Vulnerability Database)

Vulnerability Description

Source: CNNVD (China National Vulnerability Database)

CVSS Information

N/A

Source: CNNVD (China National Vulnerability Database)

Vulnerability Type

N/A

Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Linux	Linux	d17abdf7566566fc402c31899b353044a7ff3cf4 ~ 546d60859ecf13380fcabcbeace53a5971493a2b	-
Linux	Linux	5.11	-

II. Public POCs for CVE-2022-48919

#	POC Description	Source Link	Shenlong Link

AI-Generated POC Premium

No public POC found.

III. Intelligence Information for CVE-2022-48919

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Patches & Fixes for CVE-2022-48919 (1)

Oh noes!

Other References for CVE-2022-48919 (6)

https://www.cve.org/CVERecord?id=CVE-2022-48919

Same Patch Batch · Linux · 2024-08-22 · 42 CVEs total

CVE-2022-48941	8.8 HIGH	ice: fix concurrent reset and removal of VFs
CVE-2022-48925	7.8 HIGH	RDMA/cma: Do not change route.addr.src_addr outside state checks
CVE-2022-48923	7.8 HIGH	btrfs: prevent copying too big compressed lzo segment
CVE-2022-48927	7.8 HIGH	iio: adc: tsc2046: fix memory corruption by preventing array overflow
CVE-2022-48913	7.8 HIGH	blktrace: fix use after free for struct blk_trace
CVE-2022-48912	7.8 HIGH	netfilter: fix use-after-free in __nf_register_net_hook()
CVE-2022-48911	7.8 HIGH	netfilter: nf_queue: fix possible use-after-free
CVE-2022-48932	7.8 HIGH	net/mlx5: DR, Fix slab-out-of-bounds in mlx5_cmd_dr_create_fte
CVE-2022-48935	7.8 HIGH	netfilter: nf_tables: unregister flowtable hooks on netns exit
CVE-2022-48940	7.8 HIGH	bpf: Fix crash due to incorrect copy_map_value
CVE-2022-48943	7.1 HIGH	KVM: x86/mmu: make apf token non-zero to fix bug
CVE-2022-48933		netfilter: nf_tables: fix memory leak during stateful obj update
CVE-2022-48934		nfp: flower: Fix a potential leak in nfp_tunnel_add_shared_mac()
CVE-2022-48931		configfs: fix a race in configfs_{,un}register_subsystem()
CVE-2022-48937		io_uring: add a schedule point in io_add_buffers()
CVE-2022-48938		CDC-NCM: avoid overflow in sanity checking
CVE-2022-48930		RDMA/ib_srp: Fix a deadlock
CVE-2022-48929		bpf: Fix crash due to out of bounds access into reg2btf_ids.
CVE-2022-48928		iio: adc: men_z188_adc: Fix a resource leak in an error handling path
CVE-2022-48939		bpf: Add schedule points in batch ops

Showing top 20 of 42 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux

Same vendor: Linux

V. Comments for CVE-2022-48919

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Goal Reached Thanks to every supporter — we hit 100%!

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

Quick assessment

Possible ATT&CK Techniques 2 AI

Affected Version Matrix 8

I. Basic Information for CVE-2022-48919

Vulnerability Information

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Vulnerability Title

Vulnerability Description

CVSS Information

Vulnerability Type

Affected Products

II. Public POCs for CVE-2022-48919

III. Intelligence Information for CVE-2022-48919

Patches & Fixes for CVE-2022-48919 (1)

Other References for CVE-2022-48919 (6)

Same Patch Batch · Linux · 2024-08-22 · 42 CVEs total

IV. Related Vulnerabilities

V. Comments for CVE-2022-48919

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