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CVE-2025-21826— netfilter: nf_tables: reject mismatching sum of field_len with set key length

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nf_tables拒绝字段长度与集合密钥长度不匹配的情况。

CVSS 7.8 · High EPSS 0.20% · P9

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 22

VendorProduct Version RangeStatus
Linux Linux 2d4c0798a1ef8db15b3277697ac2def4eda42312< 6b467c8feac759f4c5c86d708beca2aa2b29584f affected
77be8c495a3f841e88b46508cc20d3d7d3289da3< 5083a7ae45003456c253e981b30a43f71230b4a3 affected
9cb084df01e198119de477ac691d682fb01e80f3< 2ac254343d3cf228ae0738b2615fedf85d000752 affected
dc45bb00e66a33de1abb29e3d587880e1d4d9a7e< 82e491e085719068179ff6a5466b7387cc4bbf32 affected
3ce67e3793f48c1b9635beb9bb71116ca1e51b58< 49b7182b97bafbd5645414aff054b4a65d05823d affected
3ce67e3793f48c1b9635beb9bb71116ca1e51b58< ab50d0eff4a939d20c37721fd9766347efcdb6f6 affected
3ce67e3793f48c1b9635beb9bb71116ca1e51b58< 1b9335a8000fb70742f7db10af314104b6ace220 affected
ff67e3e488090908dc015ba04d7407d8bd467f7e affected
… +14 more rows
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I. Basic Information for CVE-2025-21826

Vulnerability Information
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Vulnerability Title
netfilter: nf_tables: reject mismatching sum of field_len with set key length
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: reject mismatching sum of field_len with set key length The field length description provides the length of each separated key field in the concatenation, each field gets rounded up to 32-bits to calculate the pipapo rule width from pipapo_init(). The set key length provides the total size of the key aligned to 32-bits. Register-based arithmetics still allows for combining mismatching set key length and field length description, eg. set key length 10 and field description [ 5, 4 ] leading to pipapo width of 12.
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nf_tables拒绝字段长度与集合密钥长度不匹配的情况。
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 2d4c0798a1ef8db15b3277697ac2def4eda42312 ~ 6b467c8feac759f4c5c86d708beca2aa2b29584f -
Linux Linux 6.8 -

II. Public POCs for CVE-2025-21826

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III. Intelligence Information for CVE-2025-21826

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Patches & Fixes for CVE-2025-21826 (5)

Other References for CVE-2025-21826 (1)

Same Patch Batch · Linux · 2025-03-06 · 46 CVEs total

CVE-2025-21829 9.8 CRITICAL RDMA/rxe: Fix the warning "__rxe_cleanup+0x12c/0x170 [rdma_rxe]"
CVE-2025-21828 8.8 HIGH wifi: mac80211: don't flush non-uploaded STAs
CVE-2025-21825 7.8 HIGH bpf: Cancel the running bpf_timer through kworker for PREEMPT_RT
CVE-2024-58070 7.8 HIGH bpf: bpf_local_storage: Always use bpf_mem_alloc in PREEMPT_RT
CVE-2025-21832 7.8 HIGH block: don't revert iter for -EIOCBQUEUED
CVE-2024-58083 7.8 HIGH KVM: Explicitly verify target vCPU is online in kvm_get_vcpu()
CVE-2024-58069 7.8 HIGH rtc: pcf85063: fix potential OOB write in PCF85063 NVMEM read
CVE-2024-58086 7.8 HIGH drm/v3d: Stop active perfmon if it is being destroyed
CVE-2024-58060 7.8 HIGH bpf: Reject struct_ops registration that uses module ptr and the module btf_id is missing
CVE-2024-58075 7.8 HIGH crypto: tegra - do not transfer req when tegra init fails
CVE-2025-21827 7.8 HIGH Bluetooth: btusb: mediatek: Add locks for usb_driver_claim_interface()
CVE-2024-58079 7.8 HIGH media: uvcvideo: Fix crash during unbind if gpio unit is in use
CVE-2024-58053 7.5 HIGH rxrpc: Fix handling of received connection abort
CVE-2025-21830 7.3 HIGH landlock: Handle weird files
CVE-2024-58066 clk: mmp: pxa1908-apbcp: Fix a NULL vs IS_ERR() check
CVE-2024-58064 wifi: cfg80211: tests: Fix potential NULL dereference in test_cfg80211_parse_colocated_ap(
CVE-2024-58061 wifi: mac80211: prohibit deactivating all links
CVE-2024-58063 wifi: rtlwifi: fix memory leaks and invalid access at probe error path
CVE-2024-58065 clk: mmp: pxa1908-apbc: Fix NULL vs IS_ERR() check
CVE-2024-58062 wifi: iwlwifi: mvm: avoid NULL pointer dereference

Showing top 20 of 46 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21826

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