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CVE-2026-52928— af_unix: Reject SIOCATMARK on non-stream sockets

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 5.15版本存在安全漏洞，该漏洞源于af_unix对非流式套接字拒绝SIOCATMARK不当，可能导致支持紧急标记错误。

EPSS 0.11% · P1

Possible ATT&CK Techniques 1 AI

T1564.008 · Email Hiding Rules

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 314001f0bf927015e459c9d387d62a231fe93af3< ec123873fdc83e7244c8ed6d17b8f8ea6c416a67 affected
314001f0bf927015e459c9d387d62a231fe93af3< f085971de6d6b8ef946a5e0bcd73ff24509a0f85 affected
314001f0bf927015e459c9d387d62a231fe93af3< b741c9c6ef59f17c1f104ddf1217ef77f79ed29b affected
314001f0bf927015e459c9d387d62a231fe93af3< 645b1ed3259af38b7814242a420bc2081bdd1eb6 affected
314001f0bf927015e459c9d387d62a231fe93af3< c34c41446acf6c0d13b5b06c809be11e0f7f2729 affected
314001f0bf927015e459c9d387d62a231fe93af3< 3147ddf5a41c20c45c2eb69e00b62f10f822056a affected
314001f0bf927015e459c9d387d62a231fe93af3< d119775f2bad827edc28071c061fdd4a91f889a5 affected
5.15 affected
… +8 more rows
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I. Basic Information for CVE-2026-52928

Vulnerability Information
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Vulnerability Title
af_unix: Reject SIOCATMARK on non-stream sockets
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: af_unix: Reject SIOCATMARK on non-stream sockets SIOCATMARK reports whether the receive queue is at the urgent mark for MSG_OOB. In AF_UNIX, MSG_OOB is supported only for SOCK_STREAM sockets. SOCK_DGRAM and SOCK_SEQPACKET reject MSG_OOB in sendmsg() and recvmsg(), so they should not support SIOCATMARK either. Return -EOPNOTSUPP for non-stream sockets before checking the receive queue.
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 5.15版本存在安全漏洞，该漏洞源于af_unix对非流式套接字拒绝SIOCATMARK不当，可能导致支持紧急标记错误。
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 314001f0bf927015e459c9d387d62a231fe93af3 ~ ec123873fdc83e7244c8ed6d17b8f8ea6c416a67 -
Linux Linux 5.15 -

II. Public POCs for CVE-2026-52928

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III. Intelligence Information for CVE-2026-52928

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Patches & Fixes for CVE-2026-52928 (7)

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-2026-52928

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