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CVE-2026-53269— netfilter: synproxy: add mutex to guard hook reference counting

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存在安全漏洞，该漏洞源于synproxy基础设施在添加第一个iptables目标或nftables表达式时并发注册netfilter钩子可能发生竞争，可能导致权限的并发访问问题。以下版本受到影响：5.3版本。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.12% · P2

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux ad49d86e07a497e834cb06f2b151dccd75f8e148< 0ec9ddc1bda261a2c57636c74c8b4e53000102c9 affected
ad49d86e07a497e834cb06f2b151dccd75f8e148< 56ffbe3a08c01dcdb0d6adee9ce1e535bfb3b389 affected
ad49d86e07a497e834cb06f2b151dccd75f8e148< debc57b83d5b323df74bf010c8d50fe26ad2ed6b affected
ad49d86e07a497e834cb06f2b151dccd75f8e148< 0f8ba5e4c53d2e4a536aa68140beda9fe59b2f88 affected
ad49d86e07a497e834cb06f2b151dccd75f8e148< 640441348258220e78daed40528b85b8afcedab6 affected
ad49d86e07a497e834cb06f2b151dccd75f8e148< aaf80701dc2f7a48fe543961e21f8ca3924d587c affected
ad49d86e07a497e834cb06f2b151dccd75f8e148< fbf0591275f50eae5733c3d7a8cd6c1e79933ffa affected
ad49d86e07a497e834cb06f2b151dccd75f8e148< 2fcba19caaeb2a33017459d3430f057967bb91b6 affected
… +10 more rows
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I. Basic Information for CVE-2026-53269

Vulnerability Information
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Vulnerability Title
netfilter: synproxy: add mutex to guard hook reference counting
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: synproxy: add mutex to guard hook reference counting As the synproxy infrastructure register netfilter hooks on-demand when a user adds the first iptables target or nftables expression, if done concurrently they can race each other. Introduce a mutex to serialize the refcount control blocks access from both frontends. While a per namespace mutex might be more efficient, it is not needed for target/expression like SYNPROXY.
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存在安全漏洞，该漏洞源于synproxy基础设施在添加第一个iptables目标或nftables表达式时并发注册netfilter钩子可能发生竞争，可能导致权限的并发访问问题。以下版本受到影响：5.3版本。
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 ad49d86e07a497e834cb06f2b151dccd75f8e148 ~ 0ec9ddc1bda261a2c57636c74c8b4e53000102c9 -
Linux Linux 5.3 -

II. Public POCs for CVE-2026-53269

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III. Intelligence Information for CVE-2026-53269

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Patches & Fixes for CVE-2026-53269 (8)

Same Patch Batch · Linux · 2026-06-25 · 146 CVEs total

CVE-2026-53176 9.8 CRITICAL IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN
CVE-2026-53228 9.8 CRITICAL ipv6: sit: reload inner IPv6 header after GSO offloads
CVE-2026-53151 9.8 CRITICAL rxrpc: Fix the ACK parser to extract the SACK table for parsing
CVE-2026-53221 9.8 CRITICAL ip6_vti: fix incorrect tunnel matching in vti6_tnl_lookup()
CVE-2026-53247 9.8 CRITICAL net: ethernet: mtk_eth_soc: Fix use-after-free in metadata dst teardown
CVE-2026-53216 9.8 CRITICAL net: mvpp2: limit XDP frame size to the RX buffer
CVE-2026-53260 9.8 CRITICAL tcp: Add preempt_{disable,enable}_nested() in reqsk_queue_hash_req().
CVE-2026-53246 9.8 CRITICAL sctp: validate cached peer INIT chunk length in COOKIE_ECHO processing
CVE-2026-53175 9.8 CRITICAL inet: frags: fix use-after-free caused by the fqdir_pre_exit() flush
CVE-2026-53215 9.8 CRITICAL net: mvpp2: refill RX buffers before XDP or skb use
CVE-2026-53131 9.4 CRITICAL netfilter: require Ethernet MAC header before using eth_hdr()
CVE-2026-53225 9.1 CRITICAL sctp: fix uninit-value in __sctp_rcv_asconf_lookup()
CVE-2026-53224 9.1 CRITICAL sctp: validate embedded INIT chunk and address list lengths in cookie
CVE-2026-53186 9.1 CRITICAL RDMA/srp: bound SRP_RSP sense copy by the received length
CVE-2026-53240 8.8 HIGH xfrm: iptfs: fix use-after-free on first_skb in __input_process_payload
CVE-2026-53171 8.8 HIGH accel/ethosu: fix arithmetic issues in dma_length()
CVE-2026-53232 8.8 HIGH net: phy: clean the sfp upstream if phy probing fails
CVE-2026-53159 8.8 HIGH misc: fastrpc: fix DMA address corruption due to find_vma misuse
CVE-2026-53170 8.8 HIGH accel/ethosu: reject DMA commands with uninitialized length
CVE-2026-53188 8.8 HIGH RDMA/core: Validate the passed in fops for ib_get_ucaps()

Showing top 20 of 146 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-53269

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