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CVE-2026-98451— smb: client: use finish_no_open() for non-regular inodes

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.

在 Linux 内核中，以下漏洞已得到修复： smb: 客户端：对非普通 inode 使用 finish_no_open() 当执行带有 O_CREAT 标志的 open 操作时，可能会遇到已存在的符号链接或其他非普通 inode。cifs_atomic_open() 会对这些 inode 调用 finish_open()，并附加一个 cifsFileInfo 结构。由于符号链接的 inode 没有对应的 CIFS 释放操作，导致 cifsFileInfo 持有的 dentry 引用发生泄漏。此外，设置 FMODE

CVSS 8.8 · High EPSS 0.35% · P29 Updated Oct 24, 2026

Possible ATT&CK Techniques 1 AI

T1210 · Exploitation of Remote Services

Affected Version Matrix 12

Vendor	Product	Version Range	Status
Linux	Linux	`d2c127197dfc0b2bae62a52e1e0d3e3ff493919e< 045532f920d86dd76600b635f9756e5fd671ddfc`	affected
		`d2c127197dfc0b2bae62a52e1e0d3e3ff493919e< ed03d547598c92a036f20e89156540995cac889a`	affected
		`d2c127197dfc0b2bae62a52e1e0d3e3ff493919e< 70a7918fda54a06d836acc91eb9a3c7e860fe0a0`	affected
		`d2c127197dfc0b2bae62a52e1e0d3e3ff493919e< 3c07deb26273155c180aedfd9041ab58015d2521`	affected
		`d2c127197dfc0b2bae62a52e1e0d3e3ff493919e< e66cf1625ec4a3fe68346119f371def713fd0a4d`	affected
		`3.6`	affected
		`< 3.6`	unaffected
		`6.6.160≤ 6.6.*`	unaffected
… +4 more rows

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Vulnerability Information

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Vulnerability Title

smb: client: use finish_no_open() for non-regular inodes

Source: CVE Program / CVE List V5

Vulnerability Description

In the Linux kernel, the following vulnerability has been resolved: smb: client: use finish_no_open() for non-regular inodes An O_CREAT open can find an existing symlink or another non-regular inode. cifs_atomic_open() calls finish_open() on it and attaches a cifsFileInfo. Symlink inodes have no CIFS release operation, so the dentry reference held by cifsFileInfo is leaked. FMODE_OPENED also prevents the VFS from following the symlink. Track whether cifs_do_create() returned an open server handle. For non-regular inodes, close the handle if present, remove the pending open, and call finish_no_open() so the VFS can continue the lookup. Do not set FMODE_CREATED unless a regular file was opened. For O_NOFOLLOW with __O_REGULAR, return -ELOOP before the VFS's -EFTYPE check. Defer closing a legacy POSIX handle on a non-regular inode until after inode lookup. This avoids closing it again if lookup fails.

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

Affected Products

Vendor	Product	Affected Versions	CPE	Subscribe
Linux	Linux	d2c127197dfc0b2bae62a52e1e0d3e3ff493919e ~ 045532f920d86dd76600b635f9756e5fd671ddfc	-
Linux	Linux	3.6	-

II. Public POCs for CVE-2026-98451

#	POC Description	Source Link	Shenlong Link

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III. Intelligence Information for CVE-2026-98451

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Patches & Fixes for CVE-2026-98451 (5)

https://www.cve.org/CVERecord?id=CVE-2026-98451

Same Patch Batch · Linux · 2026-10-18 · 435 CVEs total

CVE-2026-98548	9.8 CRITICAL	sctp: discard the rest of the packet on a stale-cookie error
CVE-2026-98490	9.8 CRITICAL	net: openvswitch: conntrack: fix helper UAF due to extensions realloc
CVE-2026-98464	9.3 CRITICAL	RISC-V: KVM: Synchronize hrtimer callback during teardown
CVE-2026-98549	9.1 CRITICAL	tcp: prevent collapsing skbs across boundary in rtx queue
CVE-2026-98466	8.2 HIGH	KVM: arm64: Transfer the hyp stack pages out of the host stage-2
CVE-2026-98532	8.1 HIGH	ipv6: do not let ipv6_find_hdr() return an offset past the packet end
CVE-2026-98499	8.1 HIGH	HID: wacom: fix OOB read in wacom_wac_pen_serial_enforce()
CVE-2026-98454	8.1 HIGH	smb: client: fix create context out-of-bounds reads
CVE-2026-98524	7.8 HIGH	rds: ib: Clear the sg list when mapping an MR fails
CVE-2026-98520	7.8 HIGH	drm/amdkfd: fix use-after-free and multi-container gap in kfd_dev_mapping
CVE-2026-98491	7.8 HIGH	net: openvswitch: conntrack: avoid modifying shared unconfirmed ct entry
CVE-2026-98517	7.8 HIGH	drm/nouveau/uvmm: fix UAF in nouveau_uvmm_sm when BO is in TTM_PL_SYSTEM
CVE-2026-98443	7.8 HIGH	xfs: fix cursor and pointer handling when recovering iunlink buckets
CVE-2026-98436	7.8 HIGH	accel/amdxdna: Disable device buffer exporting
CVE-2026-98510	7.8 HIGH	drm/xe/vm: nuke PTs only after unlinking contested VMAs
CVE-2026-98515	7.8 HIGH	drm/nouveau: fix double-free in nvif_vmm_dtor
CVE-2026-98487	7.8 HIGH	net: bridge: mdb: restart port group walk after deletion
CVE-2026-98441	7.8 HIGH	net/sched: act_ct: avoid modifying shared unconfirmed ct entry
CVE-2026-98442	7.8 HIGH	net/sched: act_ct: fix helper UAF due to extensions realloc
CVE-2026-98507	7.8 HIGH	mm/rmap: fix missing barrier between anon_vma init and vma->anon_vma publish

Showing top 20 of 435 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux

Same vendor: Linux