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CVE-2026-52920— netfilter: xt_policy: fix strict mode inbound policy matching

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基金会开源的操作系统Linux所使用的内核。 Linux kernel 2.6.17版本存在安全漏洞，该漏洞源于netfilter xt_policy组件在严格模式下入站策略匹配时，错误地以反向顺序遍历sec_path条目，导致多元素入站规则无法一致匹配。

CVSS 8.3 · High EPSS 0.30% · P21

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux c4b885139203d37f76662c37ae645fe8e0f4e4e5< eb323f7b82d2e2f638de0cc2a177803eb20e0707 affected
c4b885139203d37f76662c37ae645fe8e0f4e4e5< fc1c518bb1f054831ecabb32da9b8e1dff9699c6 affected
c4b885139203d37f76662c37ae645fe8e0f4e4e5< f98b7f85e04b40e28b08c461ded0cc79f14f5509 affected
c4b885139203d37f76662c37ae645fe8e0f4e4e5< 82664d0f1ba25e4f9a71994954abae24c60f4067 affected
c4b885139203d37f76662c37ae645fe8e0f4e4e5< b130a6eefa02bd4d475f2f059da8bcfb3e7d18d9 affected
c4b885139203d37f76662c37ae645fe8e0f4e4e5< 938867e870fb5471bb16f442aeac81326e05bf65 affected
c4b885139203d37f76662c37ae645fe8e0f4e4e5< 392cc1d8408b5665215c1e9290bbf0f92339b043 affected
c4b885139203d37f76662c37ae645fe8e0f4e4e5< 4b2b4d7d4e203c92db8966b163edfacb1f0e1e29 affected
… +10 more rows
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I. Basic Information for CVE-2026-52920

Vulnerability Information
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Vulnerability Title
netfilter: xt_policy: fix strict mode inbound policy matching
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_policy: fix strict mode inbound policy matching match_policy_in() walks sec_path entries from the last transform to the first one, but strict policy matching needs to consume info->pol[] in the same forward order as the rule layout. Derive the strict-match policy position from the number of transforms already consumed so that multi-element inbound rules are matched consistently.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:N/AC:L/PR:L/UI:N/S:U/C:H/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基金会开源的操作系统Linux所使用的内核。 Linux kernel 2.6.17版本存在安全漏洞，该漏洞源于netfilter xt_policy组件在严格模式下入站策略匹配时，错误地以反向顺序遍历sec_path条目，导致多元素入站规则无法一致匹配。
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 c4b885139203d37f76662c37ae645fe8e0f4e4e5 ~ eb323f7b82d2e2f638de0cc2a177803eb20e0707 -
Linux Linux 2.6.17 -

II. Public POCs for CVE-2026-52920

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III. Intelligence Information for CVE-2026-52920

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Patches & Fixes for CVE-2026-52920 (8)

Same Patch Batch · Linux · 2026-06-24 · 219 CVEs total

CVE-2026-53049 9.8 CRITICAL gfs2: add some missing log locking
CVE-2026-52993 9.8 CRITICAL tipc: fix double-free in tipc_buf_append()
CVE-2026-52989 9.8 CRITICAL nvmet-tcp: propagate nvmet_tcp_build_pdu_iovec() errors to its callers
CVE-2026-52986 9.8 CRITICAL netfilter: nf_conntrack_sip: don't use simple_strtoul
CVE-2026-52982 9.8 CRITICAL net: usb: rtl8150: fix use-after-free in rtl8150_start_xmit()
CVE-2026-53002 9.8 CRITICAL netfilter: conntrack: remove sprintf usage
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53046 9.8 CRITICAL ksmbd: fix use-after-free from async crypto on Qualcomm crypto engine
CVE-2026-52955 9.8 CRITICAL libceph: Fix potential out-of-bounds access in crush_decode()
CVE-2026-53010 9.8 CRITICAL ksmbd: fix use-after-free in smb2_open during durable reconnect
CVE-2026-53088 9.8 CRITICAL net: bcmgenet: fix off-by-one in bcmgenet_put_txcb
CVE-2026-52914 9.8 CRITICAL batman-adv: fix fragment reassembly length accounting
CVE-2026-52924 9.8 CRITICAL sctp: purge outqueue on stale COOKIE-ECHO handling
CVE-2026-52931 9.8 CRITICAL batman-adv: tp_meter: avoid use of uninit sender vars
CVE-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
CVE-2026-53043 9.1 CRITICAL ocfs2/dlm: validate qr_numregions in dlm_match_regions()
CVE-2026-52958 9.1 CRITICAL libceph: Fix potential out-of-bounds access in osdmap_decode()
CVE-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching

Showing top 20 of 219 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-52920

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