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CVE-2026-64004— net/iucv: fix locking in .getsockopt

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基金会开源的一款操作系统内核。 Linux kernel 3.4版本存在安全漏洞，该漏洞源于net/iucv中getsockopt函数锁定问题，可能导致AF_IUCV HIPER用户通过竞争条件触发空指针取消引用，造成内核崩溃。

CVSS 7.8 · High EPSS 0.10% · P1

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 51363b8751a673a00ad48eea895266396d53fa52< 884eb247b74d86db97e3a37f0d6fc8e1e83590dd affected
51363b8751a673a00ad48eea895266396d53fa52< 45bb8de8c95d8899f4b8f61bd9bceb8132af73cb affected
51363b8751a673a00ad48eea895266396d53fa52< 1fc30bd4e55e2dd622d2d366cecd732c1841bbee affected
51363b8751a673a00ad48eea895266396d53fa52< cd691beafea0dd779e69e81ccc26b0ab50efcb5e affected
51363b8751a673a00ad48eea895266396d53fa52< 6e792b8dd3002bbc4136745928a9605df1a72b8a affected
51363b8751a673a00ad48eea895266396d53fa52< 9817369243380e287ebe5525411557eaa3aa2a79 affected
51363b8751a673a00ad48eea895266396d53fa52< 69554adc7a6fa04ede3ad7512321d83748e3c920 affected
51363b8751a673a00ad48eea895266396d53fa52< 3589d20a666caf30ad100c960a2de7de390fce88 affected
… +10 more rows
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I. Basic Information for CVE-2026-64004

Vulnerability Information
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Vulnerability Title
net/iucv: fix locking in .getsockopt
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net/iucv: fix locking in .getsockopt Mirror iucv_sock_setsockopt() and wrap the whole switch in lock_sock()/release_sock(). The pre-existing SO_MSGLIMIT-only lock becomes redundant and is removed. Any AF_IUCV HIPER user can potentially crash the kernel by racing recvmsg() with getsockopt(SO_MSGSIZE): the SO_MSGSIZE arm dereferences iucv->hs_dev->mtu after iucv_sock_close() (called from the racing recvmsg()) has set hs_dev to NULL, producing a NULL pointer dereference oops.
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基金会开源的一款操作系统内核。 Linux kernel 3.4版本存在安全漏洞，该漏洞源于net/iucv中getsockopt函数锁定问题，可能导致AF_IUCV HIPER用户通过竞争条件触发空指针取消引用，造成内核崩溃。
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 51363b8751a673a00ad48eea895266396d53fa52 ~ 884eb247b74d86db97e3a37f0d6fc8e1e83590dd -
Linux Linux 3.4 -

II. Public POCs for CVE-2026-64004

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III. Intelligence Information for CVE-2026-64004

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Patches & Fixes for CVE-2026-64004 (7)

Same Patch Batch · Linux · 2026-07-19 · 429 CVEs total

CVE-2026-63795 10.0 CRITICAL 9p: avoid putting oldfid in p9_client_walk() error path
CVE-2026-64068 9.8 CRITICAL netfs: Fix missing locking around retry adding new subreqs
CVE-2026-63993 9.8 CRITICAL vxlan: do not reuse cached ip_hdr() value after skb_tunnel_check_pmtu()
CVE-2026-64142 9.8 CRITICAL ksmbd: close durable scavenger races against m_fp_list lookups
CVE-2026-64033 9.8 CRITICAL RDMA/rtrs: Fix use-after-free in path file creation cleanup
CVE-2026-53399 9.8 CRITICAL nfsd: release layout stid on setlease failure
CVE-2026-53398 9.8 CRITICAL NFSD: Fix SECINFO_NO_NAME decode error cleanup
CVE-2026-64061 9.8 CRITICAL netfs: Fix early put of sink folio in netfs_read_gaps()
CVE-2026-64025 9.8 CRITICAL bpf, skmsg: fix verdict sk_data_ready racing with ktls rx
CVE-2026-64089 9.8 CRITICAL batman-adv: tt: fix negative last_changeset_len
CVE-2026-64125 9.8 CRITICAL net: bcmgenet: keep RBUF EEE/PM disabled
CVE-2026-64091 9.8 CRITICAL batman-adv: tt: fix TOCTOU race for reported vlans
CVE-2026-64066 9.8 CRITICAL netfs: Fix netfs_read_to_pagecache() to pause on subreq failure
CVE-2026-63887 9.8 CRITICAL scsi: target: iscsi: Bound iscsi_encode_text_output() appends to rsp_buf
CVE-2026-63808 9.8 CRITICAL exfat: fix potential use-after-free in exfat_find_dir_entry()
CVE-2026-63978 9.8 CRITICAL net/handshake: Drain pending requests at net namespace exit
CVE-2026-64132 9.8 CRITICAL ipv6: ioam: refresh hdr pointer before ioam6_event()
CVE-2026-63979 9.8 CRITICAL net/handshake: hand off the pinned file reference to accept_doit
CVE-2026-64136 9.8 CRITICAL smb: client: protect tc_count increment in smb2_find_smb_sess_tcon_unlocked()
CVE-2026-63800 9.8 CRITICAL pNFS: Fix use-after-free in pnfs_update_layout()

Showing top 20 of 429 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-64004

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