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CVE-2026-31407— netfilter: conntrack: add missing netlink policy validations

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，该漏洞源于缺少netlink策略验证，可能导致越界访问。

CVSS 7.1 · High EPSS 0.17% · P6

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux a258860e01b80e8f554a4ab1a6c95e6042eb8b73< e7b5766693477c52424cc6c79dd30a7a9c7db52c affected
a258860e01b80e8f554a4ab1a6c95e6042eb8b73< 78bba9f73942aa7dca47d817d8cec0fb9b443b70 affected
a258860e01b80e8f554a4ab1a6c95e6042eb8b73< be88a337bf07afb1ee173f1099294d1b7ab3fefe affected
a258860e01b80e8f554a4ab1a6c95e6042eb8b73< c5e918390002edf0cff80a0e7ce1f86f16a9507c affected
a258860e01b80e8f554a4ab1a6c95e6042eb8b73< 9174d28f3f15d8c4962f5980c0be167633880443 affected
a258860e01b80e8f554a4ab1a6c95e6042eb8b73< 67c53c1978cef3c504237275e39c857e2f6af56e affected
a258860e01b80e8f554a4ab1a6c95e6042eb8b73< 0fbae1e74493d5a160a70c51aeba035d8266ea7d affected
a258860e01b80e8f554a4ab1a6c95e6042eb8b73< f900e1d77ee0ef87bfb5ab3fe60f0b3d8ad5ba05 affected
… +10 more rows
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I. Basic Information for CVE-2026-31407

Vulnerability Information
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Vulnerability Title
netfilter: conntrack: add missing netlink policy validations
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: conntrack: add missing netlink policy validations Hyunwoo Kim reports out-of-bounds access in sctp and ctnetlink. These attributes are used by the kernel without any validation. Extend the netlink policies accordingly. Quoting the reporter: nlattr_to_sctp() assigns the user-supplied CTA_PROTOINFO_SCTP_STATE value directly to ct->proto.sctp.state without checking that it is within the valid range. [..] and: ... with exp->dir = 100, the access at ct->master->tuplehash[100] reads 5600 bytes past the start of a 320-byte nf_conn object, causing a slab-out-of-bounds read confirmed by UBSAN.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/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，该漏洞源于缺少netlink策略验证，可能导致越界访问。
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 a258860e01b80e8f554a4ab1a6c95e6042eb8b73 ~ e7b5766693477c52424cc6c79dd30a7a9c7db52c -
Linux Linux 2.6.27 -

II. Public POCs for CVE-2026-31407

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III. Intelligence Information for CVE-2026-31407

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Patches & Fixes for CVE-2026-31407 (4)

Same Patch Batch · Linux · 2026-04-06 · 6 CVEs total

CVE-2026-31405 9.8 CRITICAL media: dvb-net: fix OOB access in ULE extension header tables
CVE-2026-31408 8.8 HIGH Bluetooth: SCO: Fix use-after-free in sco_recv_frame() due to missing sock_hold
CVE-2026-31409 8.8 HIGH ksmbd: unset conn->binding on failed binding request
CVE-2026-31406 7.8 HIGH xfrm: Fix work re-schedule after cancel in xfrm_nat_keepalive_net_fini()
CVE-2026-31410 ksmbd: use volume UUID in FS_OBJECT_ID_INFORMATION

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31407

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