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CVE-2026-43451— netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path

AI Predicted 5.9 Difficulty: Easy EPSS 0.01% · P2

Possible ATT&CK Techniques 1AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinux8d45ff22f1b43249f0cf1baafe0262ca10d1666e< a907bea273b60d3e604ec4e8e1f6c49954805794affected
8d45ff22f1b43249f0cf1baafe0262ca10d1666e< 0b18d1b834ab5a5009be70b530f978d7989e445baffected
8d45ff22f1b43249f0cf1baafe0262ca10d1666e< b38d2b4603fd3dda24eb8b3dd81c18a0930be97baffected
8d45ff22f1b43249f0cf1baafe0262ca10d1666e< 47b1c5d1b0944aa88299f55a846fabaefc756982affected
8d45ff22f1b43249f0cf1baafe0262ca10d1666e< cf4a4df38d1747e06fc54f9879bd7a6f4178032faffected
8d45ff22f1b43249f0cf1baafe0262ca10d1666e< 9853d94b82d303fc4ac37d592a23a154096ecd41affected
8d45ff22f1b43249f0cf1baafe0262ca10d1666e< 208669df703a25a601f45822b10c413f258bf275affected
8d45ff22f1b43249f0cf1baafe0262ca10d1666e< f1ba83755d81c6fc66ac7acd723d238f974091e9affected
… +10 more rows
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I. Basic Information for CVE-2026-43451

Vulnerability Information
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Vulnerability Title
netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nfnetlink_queue: fix entry leak in bridge verdict error path nfqnl_recv_verdict() calls find_dequeue_entry() to remove the queue entry from the queue data structures, taking ownership of the entry. For PF_BRIDGE packets, it then calls nfqa_parse_bridge() to parse VLAN attributes. If nfqa_parse_bridge() returns an error (e.g. NFQA_VLAN present but NFQA_VLAN_TCI missing), the function returns immediately without freeing the dequeued entry or its sk_buff. This leaks the nf_queue_entry, its associated sk_buff, and all held references (net_device refcounts, struct net refcount). Repeated triggering exhausts kernel memory. Fix this by dropping the entry via nfqnl_reinject() with NF_DROP verdict on the error path, consistent with other error handling in this file.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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netfilter nfnetlink_queue中桥接判决错误路径的条目泄漏问题，可能导致内核内存耗尽。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux 8d45ff22f1b43249f0cf1baafe0262ca10d1666e ~ a907bea273b60d3e604ec4e8e1f6c49954805794 -
LinuxLinux 4.7 -

II. Public POCs for CVE-2026-43451

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III. Intelligence Information for CVE-2026-43451

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Patches & Fixes for CVE-2026-43451 (8)

Same Patch Batch · Linux · 2026-05-08 · 199 CVEs total

CVE-2026-433769.8 CRITICALksmbd: fix use-after-free by using call_rcu() for oplock_info
CVE-2026-434149.8 CRITICALscsi: qla2xxx: Completely fix fcport double free
CVE-2026-433789.8 CRITICALsmb: server: fix use-after-free in smb2_open()
CVE-2026-433049.8 CRITICALlibceph: define and enforce CEPH_MAX_KEY_LEN
CVE-2026-434029.8 CRITICALkthread: consolidate kthread exit paths to prevent use-after-free
CVE-2026-433419.8 CRITICALnet/ipv6: ioam6: prevent schema length wraparound in trace fill
CVE-2026-433799.8 CRITICALksmbd: fix use-after-free in smb_lazy_parent_lease_break_close()
CVE-2026-434659.8 CRITICALnet/mlx5e: RX, Fix XDP multi-buf frag counting for striding RQ
CVE-2026-433849.8 CRITICALnet/tcp-ao: Fix MAC comparison to be constant-time
CVE-2026-433839.4 CRITICALnet/tcp-md5: Fix MAC comparison to be constant-time
CVE-2026-434079.1 CRITICALlibceph: Fix potential out-of-bounds access in ceph_handle_auth_reply()
CVE-2026-434069.1 CRITICALlibceph: prevent potential out-of-bounds reads in process_message_header()
CVE-2026-432848.8 HIGHxfrm: esp: avoid in-place decrypt on shared skb frags
CVE-2026-433348.8 HIGHBluetooth: SMP: force responder MITM requirements before building the pairing response
CVE-2026-434038.8 HIGHnsfs: tighten permission checks for ns iteration ioctls
CVE-2026-433228.8 HIGHBluetooth: hci_sync: Fix UAF in le_read_features_complete
CVE-2026-433918.8 HIGHnsfs: tighten permission checks for handle opening
CVE-2026-432918.3 HIGHnet: nfc: nci: Fix parameter validation for packet data
CVE-2026-434668.2 HIGHnet/mlx5e: Fix DMA FIFO desync on error CQE SQ recovery
CVE-2026-433658.2 HIGHxfs: fix undersized l_iclog_roundoff values

Showing top 20 of 199 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-43451

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