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CVE-2026-31673— af_unix: read UNIX_DIAG_VFS data under unix_state_lock

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af_unix中UNIX_DIAG_VFS数据在未持有锁时读取，可能导致并发释放后访问已释放路径信息。

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1005 · Data from Local System

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 5f7b0569460b7d8d01ca776430a00505a68b7584< e7339db13b9ddb63417b12da55fd6191e59f7442 affected
5f7b0569460b7d8d01ca776430a00505a68b7584< 4f6a8f10182c3a9d22e8eb183957ae7ade9e4bf7 affected
5f7b0569460b7d8d01ca776430a00505a68b7584< c3ec44ab4526bbc4b6c9fc845af86488244f4c9b affected
5f7b0569460b7d8d01ca776430a00505a68b7584< b9232421a77a649c9376c99fdfc8cb7f79cad34c affected
5f7b0569460b7d8d01ca776430a00505a68b7584< 0c739f3785f84af695952c2bac8be2f45082c9b8 affected
5f7b0569460b7d8d01ca776430a00505a68b7584< 900a4e0910e98b8caef117d5df00471fa438dcf9 affected
5f7b0569460b7d8d01ca776430a00505a68b7584< bdf206e740bf2919d818f132c8c9cc7ed91d11c0 affected
5f7b0569460b7d8d01ca776430a00505a68b7584< 39897df386376912d561d4946499379effa1e7ef affected
… +10 more rows
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I. Basic Information for CVE-2026-31673

Vulnerability Information
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Vulnerability Title
af_unix: read UNIX_DIAG_VFS data under unix_state_lock
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: af_unix: read UNIX_DIAG_VFS data under unix_state_lock Exact UNIX diag lookups hold a reference to the socket, but not to u->path. Meanwhile, unix_release_sock() clears u->path under unix_state_lock() and drops the path reference after unlocking. Read the inode and device numbers for UNIX_DIAG_VFS while holding unix_state_lock(), then emit the netlink attribute after dropping the lock. This keeps the VFS data stable while the reply is being built.
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af_unix中UNIX_DIAG_VFS数据在未持有锁时读取，可能导致并发释放后访问已释放路径信息。
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 5f7b0569460b7d8d01ca776430a00505a68b7584 ~ e7339db13b9ddb63417b12da55fd6191e59f7442 -
Linux Linux 3.3 -

II. Public POCs for CVE-2026-31673

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III. Intelligence Information for CVE-2026-31673

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Patches & Fixes for CVE-2026-31673 (4)

Same Patch Batch · Linux · 2026-04-25 · 13 CVEs total

CVE-2026-31685 9.4 CRITICAL netfilter: ip6t_eui64: reject invalid MAC header for all packets
CVE-2026-31682 9.1 CRITICAL bridge: br_nd_send: linearize skb before parsing ND options
CVE-2026-31683 7.8 HIGH batman-adv: avoid OGM aggregation when skb tailroom is insufficient
CVE-2026-31680 7.8 HIGH net: ipv6: flowlabel: defer exclusive option free until RCU teardown
CVE-2026-31678 7.8 HIGH openvswitch: defer tunnel netdev_put to RCU release
CVE-2026-31675 7.8 HIGH net/sched: sch_netem: fix out-of-bounds access in packet corruption
CVE-2026-31676 7.5 HIGH rxrpc: only handle RESPONSE during service challenge
CVE-2026-31679 7.1 HIGH openvswitch: validate MPLS set/set_masked payload length
CVE-2026-31674 7.1 HIGH netfilter: ip6t_rt: reject oversized addrnr in rt_mt6_check()
CVE-2026-31684 net: sched: act_csum: validate nested VLAN headers
CVE-2026-31681 netfilter: xt_multiport: validate range encoding in checkentry
CVE-2026-31677 crypto: af_alg - limit RX SG extraction by receive buffer budget

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31673

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