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CVE-2026-52921— netfilter: ipset: stop hash:* range iteration at end

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 4.14版本存在安全漏洞，该漏洞源于netfilter: ipset组件中的hash:*范围迭代问题，在IPv4范围迭代中，迭代器可能被错误地移动超过请求末尾位置，导致重试时从未预期的位置继续。

AI Predicted 5.9 Difficulty: Moderate EPSS 0.11% · P1

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 48596a8ddc46f96afb6a2cd72787cb15d6bb01fc< be75218fadea22e59c8673db212f29c681bf45bb affected
48596a8ddc46f96afb6a2cd72787cb15d6bb01fc< 383418c20e69f5761b6ec5238f599423f4fb77fb affected
48596a8ddc46f96afb6a2cd72787cb15d6bb01fc< 0d7b33ace701fe397e6e4de145f32e098178d901 affected
48596a8ddc46f96afb6a2cd72787cb15d6bb01fc< c281e018af98df91827d65bec00f4956c00a1b02 affected
48596a8ddc46f96afb6a2cd72787cb15d6bb01fc< 02f75f041a93ea045834da89cd3234f4c1d749b4 affected
48596a8ddc46f96afb6a2cd72787cb15d6bb01fc< 952e988163c2ab9939c3db9f0f8e77af6a1bb436 affected
48596a8ddc46f96afb6a2cd72787cb15d6bb01fc< 0b530efb2cc9dbdddfd49d392e3a857f0d4ce8dc affected
48596a8ddc46f96afb6a2cd72787cb15d6bb01fc< 0d3a282ab5f165fc207ff49ea5b6ad8f54616bd6 affected
… +10 more rows
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I. Basic Information for CVE-2026-52921

Vulnerability Information
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Vulnerability Title
netfilter: ipset: stop hash:* range iteration at end
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: stop hash:* range iteration at end The following hash set variants: hash:ip,mark hash:ip,port hash:ip,port,ip hash:ip,port,net iterate IPv4 ranges with a 32-bit iterator. The iterator must stop once the last address in the requested range has been processed. Advancing it once more can move the traversal state past the end of the request, so a later retry may continue from an unintended position. Handle the iterator increment explicitly at the end of the loop and stop once the upper bound has been processed. This keeps the existing retry behaviour intact for valid ranges while preventing traversal from continuing past the original boundary.
Source: CVE Program / CVE List V5
CVSS Information
N/A
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 4.14版本存在安全漏洞，该漏洞源于netfilter: ipset组件中的hash:*范围迭代问题，在IPv4范围迭代中，迭代器可能被错误地移动超过请求末尾位置，导致重试时从未预期的位置继续。
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 48596a8ddc46f96afb6a2cd72787cb15d6bb01fc ~ be75218fadea22e59c8673db212f29c681bf45bb -
Linux Linux 4.14 -

II. Public POCs for CVE-2026-52921

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III. Intelligence Information for CVE-2026-52921

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Patches & Fixes for CVE-2026-52921 (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-2026-53006 9.8 CRITICAL ipv6: fix possible UAF in icmpv6_rcv()
CVE-2026-53045 9.8 CRITICAL memory: tegra124-emc: Fix dll_change check
CVE-2026-53086 9.8 CRITICAL net: bcmgenet: fix racing timeout handler
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-2026-53055 9.8 CRITICAL crypto: hisilicon/sec2 - prevent req used-after-free for sec
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-2026-52999 9.1 CRITICAL netfilter: nfnetlink_osf: fix out-of-bounds read on option matching
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()

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-2026-52921

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