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CVE-2026-72310— smb: client: fix overflow in passthrough ioctl bounds check

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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于smb客户端在passthrough ioctl边界检查中，OutputOffset和input_buffer_length直接相加导致32位算术溢出，恶意服务器可能利用该漏洞绕过边界检查并越界读取响应缓冲区外的数据。

CVSS 8.1 · High EPSS 0.64% · P50

Possible ATT&CK Techniques 2 AI

T1053.003 · Cron T1059.004 · Unix Shell

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 2b1116bbe898aefdf584838448c6869f69851e0f< 175357ee0c596cb82054650dfa32fda51ad35aaa affected
2b1116bbe898aefdf584838448c6869f69851e0f< dbd126539c098dba3159ce7d34b10b2daddcbd0f affected
2b1116bbe898aefdf584838448c6869f69851e0f< 63feb687e89a3a52a31e6e01764117cc500f1974 affected
2b1116bbe898aefdf584838448c6869f69851e0f< 160045fc943f6c46b227644261252c8a22b8a87a affected
2b1116bbe898aefdf584838448c6869f69851e0f< b30771b69eafae750afb7385fbcc3d77ed3f3670 affected
2b1116bbe898aefdf584838448c6869f69851e0f< 1627e7d5c9b09721a141d07cedb178882f1ded67 affected
2b1116bbe898aefdf584838448c6869f69851e0f< 1a638c55f2db6cb2296e5e3138015dd8fd9d4aa9 affected
2b1116bbe898aefdf584838448c6869f69851e0f< a4f27ad055392fa164f5649e89a3637b033c5fcc affected
… +12 more rows
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I. Basic Information for CVE-2026-72310

Vulnerability Information
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Vulnerability Title
smb: client: fix overflow in passthrough ioctl bounds check
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: smb: client: fix overflow in passthrough ioctl bounds check smb2_ioctl_query_info() validates the PASSTHRU_FSCTL response payload before copying it to userspace. The payload offset and length both come from 32-bit fields. The bounds check currently adds OutputOffset and qi.input_buffer_length directly, so the addition can wrap in 32-bit arithmetic before the result is compared against the response buffer length. A malicious server can use a large OutputOffset and a small OutputCount to make the wrapped sum pass the bounds check. The later copy_to_user() then reads from io_rsp + OutputOffset, outside the response buffer. Use size_add() for the offset plus length check so overflow is treated as out of bounds.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/I:N/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基金会开源的一个操作系统内核。 Linux kernel存在安全漏洞，该漏洞源于smb客户端在passthrough ioctl边界检查中，OutputOffset和input_buffer_length直接相加导致32位算术溢出，恶意服务器可能利用该漏洞绕过边界检查并越界读取响应缓冲区外的数据。
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 2b1116bbe898aefdf584838448c6869f69851e0f ~ 175357ee0c596cb82054650dfa32fda51ad35aaa -
Linux Linux 5.5 -

II. Public POCs for CVE-2026-72310

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III. Intelligence Information for CVE-2026-72310

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Patches & Fixes for CVE-2026-72310 (7)

Same Patch Batch · Linux · 2026-08-15 · 844 CVEs total

CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72041 9.8 CRITICAL espintcp: use sk_msg_free_partial to fix partial send
CVE-2026-74436 9.8 CRITICAL rxrpc: serialize kernel accept preallocation with socket teardown
CVE-2026-72210 9.8 CRITICAL ntfs: fix off-by-one in mapping pairs decoding bounds checks
CVE-2026-72211 9.8 CRITICAL ntfs: grow index root value before reparent header update
CVE-2026-72209 9.8 CRITICAL ntfs: validate attribute values on lookup
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-74434 9.8 CRITICAL rxrpc: Don't move a peeked OOB message onto the pending queue
CVE-2026-74433 9.8 CRITICAL rxrpc: Fix UAF in rxgk_issue_challenge()
CVE-2026-72473 9.8 CRITICAL xprtrdma: Decouple req recycling from RPC completion
CVE-2026-72472 9.8 CRITICAL nfs: use nfsi->rwsem to protect traversal of the file lock list
CVE-2026-74545 9.8 CRITICAL rtase: fix double free of multi-frag skb on DMA map failure
CVE-2026-72322 9.8 CRITICAL ipv6: mcast: Fix potential UAF in MLD delayed work

Showing top 20 of 844 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-72310

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