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CVE-2025-40206— netfilter: nft_objref: validate objref and objrefmap expressions

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，该漏洞源于对象引用验证不足，可能导致无限递归崩溃。

CVSS 7.8 · High EPSS 0.15% · P4

Possible ATT&CK Techniques 1 AI

T1499 · Endpoint Denial of Service

Affected Version Matrix 12

VendorProduct Version RangeStatus
Linux Linux ee394f96ad7517fbc0de9106dcc7ce9efb14f264< f31bcea12222a26d6f151df9c4a6d21f2eec1724 affected
ee394f96ad7517fbc0de9106dcc7ce9efb14f264< 0028e0134c64d9ed21728341a74fcfc59cd0f944 affected
ee394f96ad7517fbc0de9106dcc7ce9efb14f264< 7ea55a44493a5a36c3b3293b88bbe4841f9dbaf0 affected
ee394f96ad7517fbc0de9106dcc7ce9efb14f264< 4c1cf72ec10be5a9ad264650cadffa1fbce6fabd affected
ee394f96ad7517fbc0de9106dcc7ce9efb14f264< f359b809d54c6e3dd1d039b97e0b68390b0e53e4 affected
5.4 affected
< 5.4 unaffected
6.1.184≤ 6.1.* unaffected
… +4 more rows
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I. Basic Information for CVE-2025-40206

Vulnerability Information
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Vulnerability Title
netfilter: nft_objref: validate objref and objrefmap expressions
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_objref: validate objref and objrefmap expressions Referencing a synproxy stateful object from OUTPUT hook causes kernel crash due to infinite recursive calls: BUG: TASK stack guard page was hit at 000000008bda5b8c (stack is 000000003ab1c4a5..00000000494d8b12) [...] Call Trace: __find_rr_leaf+0x99/0x230 fib6_table_lookup+0x13b/0x2d0 ip6_pol_route+0xa4/0x400 fib6_rule_lookup+0x156/0x240 ip6_route_output_flags+0xc6/0x150 __nf_ip6_route+0x23/0x50 synproxy_send_tcp_ipv6+0x106/0x200 synproxy_send_client_synack_ipv6+0x1aa/0x1f0 nft_synproxy_do_eval+0x263/0x310 nft_do_chain+0x5a8/0x5f0 [nf_tables nft_do_chain_inet+0x98/0x110 nf_hook_slow+0x43/0xc0 __ip6_local_out+0xf0/0x170 ip6_local_out+0x17/0x70 synproxy_send_tcp_ipv6+0x1a2/0x200 synproxy_send_client_synack_ipv6+0x1aa/0x1f0 [...] Implement objref and objrefmap expression validate functions. Currently, only NFT_OBJECT_SYNPROXY object type requires validation. This will also handle a jump to a chain using a synproxy object from the OUTPUT hook. Now when trying to reference a synproxy object in the OUTPUT hook, nft will produce the following error: synproxy_crash.nft: Error: Could not process rule: Operation not supported synproxy name mysynproxy ^^^^^^^^^^^^^^^^^^^^^^^^
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，该漏洞源于对象引用验证不足，可能导致无限递归崩溃。
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 ee394f96ad7517fbc0de9106dcc7ce9efb14f264 ~ f31bcea12222a26d6f151df9c4a6d21f2eec1724 -
Linux Linux 5.4 -

II. Public POCs for CVE-2025-40206

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III. Intelligence Information for CVE-2025-40206

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Same Patch Batch · Linux · 2025-11-12 · 96 CVEs total

CVE-2025-40176 9.8 CRITICAL tls: wait for pending async decryptions if tls_strp_msg_hold fails
CVE-2025-40140 8.8 HIGH net: usb: Remove disruptive netif_wake_queue in rtl8150_set_multicast
CVE-2025-40204 8.1 HIGH sctp: Fix MAC comparison to be constant-time
CVE-2025-40135 8.1 HIGH ipv6: use RCU in ip6_xmit()
CVE-2025-40158 8.1 HIGH ipv6: use RCU in ip6_output()
CVE-2025-40186 8.1 HIGH tcp: Don't call reqsk_fastopen_remove() in tcp_conn_request().
CVE-2025-40168 8.1 HIGH smc: Use __sk_dst_get() and dst_dev_rcu() in smc_clc_prfx_match().
CVE-2025-40133 8.1 HIGH mptcp: Use __sk_dst_get() and dst_dev_rcu() in mptcp_active_enable().
CVE-2025-40141 8.0 HIGH Bluetooth: ISO: Fix possible UAF on iso_conn_free
CVE-2025-40198 7.8 HIGH ext4: avoid potential buffer over-read in parse_apply_sb_mount_options()
CVE-2025-40172 7.8 HIGH accel/qaic: Treat remaining == 0 as error in find_and_map_user_pages()
CVE-2025-40203 7.8 HIGH listmount: don't call path_put() under namespace semaphore
CVE-2025-40201 7.8 HIGH kernel/sys.c: fix the racy usage of task_lock(tsk->group_leader) in sys_prlimit64() paths
CVE-2025-40199 7.8 HIGH page_pool: Fix PP_MAGIC_MASK to avoid crashing on some 32-bit arches
CVE-2025-40165 7.8 HIGH media: nxp: imx8-isi: m2m: Fix streaming cleanup on release
CVE-2025-40166 7.8 HIGH drm/xe/guc: Check GuC running state before deregistering exec queue
CVE-2025-40167 7.8 HIGH ext4: detect invalid INLINE_DATA + EXTENTS flag combination
CVE-2025-40159 7.8 HIGH xsk: Harden userspace-supplied xdp_desc validation
CVE-2025-40151 7.8 HIGH LoongArch: BPF: No support of struct argument in trampoline programs
CVE-2025-40149 7.8 HIGH tls: Use __sk_dst_get() and dst_dev_rcu() in get_netdev_for_sock().

Showing top 20 of 96 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40206

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