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CVE-2026-72350— netfilter: xt_u32: reject invalid shift counts

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netfilter xt_u32组件中的u32_match_it函数对移位操作数验证不足，恶意u32规则可提供32或更大的移位计数，导致数据包评估期间发生未定义的移位越界。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1562

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1b50b8a371e90a5e110f466e4ac02cf6b5f681de< ca7c92d9701249e6daf132087756a88cbf2bb2a3 affected
1b50b8a371e90a5e110f466e4ac02cf6b5f681de< b33b44250d57ab0e5a1e2571b5285fb0d0a7f382 affected
1b50b8a371e90a5e110f466e4ac02cf6b5f681de< 728f479dc0447ae7eaef87926ff49142e415a811 affected
1b50b8a371e90a5e110f466e4ac02cf6b5f681de< 0a8b7a6d763775709c601f584e709ae48bcc000a affected
1b50b8a371e90a5e110f466e4ac02cf6b5f681de< cce42014415cecd98aa49b3950e7b02ee7c81268 affected
1b50b8a371e90a5e110f466e4ac02cf6b5f681de< a597a722fb71a534138c20359b655726622b5f17 affected
1b50b8a371e90a5e110f466e4ac02cf6b5f681de< 00d034fe8230dfc5832fe011ff2d81c1a2cc7a29 affected
1b50b8a371e90a5e110f466e4ac02cf6b5f681de< 64cdf7d30ac18e43df6c48004435febb965809a8 affected
… +10 more rows
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I. Basic Information for CVE-2026-72350

Vulnerability Information
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Vulnerability Title
netfilter: xt_u32: reject invalid shift counts
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_u32: reject invalid shift counts u32_match_it() executes rule-supplied shift operands on a 32-bit value. A malformed u32 rule can provide a shift count of 32 or more, triggering an undefined shift out-of-bounds during packet evaluation. Validate XT_U32_LEFTSH and XT_U32_RIGHTSH operands in u32_mt_checkentry() and reject malformed rules before they reach the packet path.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/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
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netfilter xt_u32组件中的u32_match_it函数对移位操作数验证不足，恶意u32规则可提供32或更大的移位计数，导致数据包评估期间发生未定义的移位越界。
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 1b50b8a371e90a5e110f466e4ac02cf6b5f681de ~ ca7c92d9701249e6daf132087756a88cbf2bb2a3 -
Linux Linux 2.6.23 -

II. Public POCs for CVE-2026-72350

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III. Intelligence Information for CVE-2026-72350

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Patches & Fixes for CVE-2026-72350 (5)

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-2026-72350

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