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CVE-2026-43350— smb: client: require a full NFS mode SID before reading mode bits

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SMB客户端中parse_dacl函数将匹配sid_unix_NFS_mode的ACE视为NFS模式SID并读取sub_auth[2]，但恶意服务器可返回仅两个子权威的ACE导致越界读取。

CVSS 7.6 · High EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux e2f8fbfb8d09c06decde162090fac3ee220aa280< 23b54d6cc3ef30a51d984dc74364f24039ae2ecb affected
e2f8fbfb8d09c06decde162090fac3ee220aa280< 1592a6cd6f653f2d24572a6976c7a775b19f4940 affected
e2f8fbfb8d09c06decde162090fac3ee220aa280< 8bd4cad3f458d11650d51c2d24b03fb1770ae6cc affected
e2f8fbfb8d09c06decde162090fac3ee220aa280< b53b8e98c23310294fc45fc686db5ee860311896 affected
e2f8fbfb8d09c06decde162090fac3ee220aa280< c8eef12af1cc73031639ea7cf16e0b10e2536b0b affected
e2f8fbfb8d09c06decde162090fac3ee220aa280< 38a69f08ee82c450d3e4168707fff2e317dc3ff7 affected
e2f8fbfb8d09c06decde162090fac3ee220aa280< f8488c07bea2431ee12a6067d736578064fa46b4 affected
e2f8fbfb8d09c06decde162090fac3ee220aa280< 2757ad3e4b6f9e0fed4c7739594e702abc5cab21 affected
… +10 more rows
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I. Basic Information for CVE-2026-43350

Vulnerability Information
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Vulnerability Title
smb: client: require a full NFS mode SID before reading mode bits
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: require a full NFS mode SID before reading mode bits parse_dacl() treats an ACE SID matching sid_unix_NFS_mode as an NFS mode SID and reads sid.sub_auth[2] to recover the mode bits. That assumes the ACE carries three subauthorities, but compare_sids() only compares min(a, b) subauthorities. A malicious server can return an ACE with num_subauth = 2 and sub_auth[] = {88, 3}, which still matches sid_unix_NFS_mode and then drives the sub_auth[2] read four bytes past the end of the ACE. Require num_subauth >= 3 before treating the ACE as an NFS mode SID. This keeps the fix local to the special-SID mode path without changing compare_sids() semantics for the rest of cifsacl.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:L/I:L/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
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SMB客户端中parse_dacl函数将匹配sid_unix_NFS_mode的ACE视为NFS模式SID并读取sub_auth[2]，但恶意服务器可返回仅两个子权威的ACE导致越界读取。
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 e2f8fbfb8d09c06decde162090fac3ee220aa280 ~ 23b54d6cc3ef30a51d984dc74364f24039ae2ecb -
Linux Linux 5.4 -

II. Public POCs for CVE-2026-43350

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III. Intelligence Information for CVE-2026-43350

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Patches & Fixes for CVE-2026-43350 (8)

Same Patch Batch · Linux · 2026-05-08 · 197 CVEs total

CVE-2026-43414 9.8 CRITICAL scsi: qla2xxx: Completely fix fcport double free
CVE-2026-43341 9.8 CRITICAL net/ipv6: ioam6: prevent schema length wraparound in trace fill
CVE-2026-43402 9.8 CRITICAL kthread: consolidate kthread exit paths to prevent use-after-free
CVE-2026-43304 9.8 CRITICAL libceph: define and enforce CEPH_MAX_KEY_LEN
CVE-2026-43384 9.8 CRITICAL net/tcp-ao: Fix MAC comparison to be constant-time
CVE-2026-43376 9.8 CRITICAL ksmbd: fix use-after-free by using call_rcu() for oplock_info
CVE-2026-43378 9.8 CRITICAL smb: server: fix use-after-free in smb2_open()
CVE-2026-43379 9.8 CRITICAL ksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()
CVE-2026-43465 9.8 CRITICAL net/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ
CVE-2026-43383 9.4 CRITICAL net/tcp-md5: Fix MAC comparison to be constant-time
CVE-2026-43406 9.1 CRITICAL libceph: prevent potential out-of-bounds reads in process_message_header()
CVE-2026-43407 9.1 CRITICAL libceph: Fix potential out-of-bounds access in ceph_handle_auth_reply()
CVE-2026-43334 8.8 HIGH Bluetooth: SMP: force responder MITM requirements before building the pairing response
CVE-2026-43322 8.8 HIGH Bluetooth: hci_sync: Fix UAF in le_read_features_complete
CVE-2026-43403 8.8 HIGH nsfs: tighten permission checks for ns iteration ioctls
CVE-2026-43284 8.8 HIGH xfrm: esp: avoid in-place decrypt on shared skb frags
CVE-2026-43391 8.8 HIGH nsfs: tighten permission checks for handle opening
CVE-2026-43291 8.3 HIGH net: nfc: nci: Fix parameter validation for packet data
CVE-2026-43466 8.2 HIGH net/mlx5e: Fix DMA FIFO desync on error CQE SQ recovery
CVE-2026-43452 8.2 HIGH netfilter: x_tables: guard option walkers against 1-byte tail reads

Showing top 20 of 197 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43350

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