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CVE-2026-31424— netfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP

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xt_check_match/xt_check_target扩展对NFPROTO_ARP的限制不当，可能导致空指针取消引用。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.17% · P6

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 9291747f118d6404e509747b85ff5f6dfec368d2< 80e3c75f71c3ea1e62fcb032382de13e00a68f8b affected
9291747f118d6404e509747b85ff5f6dfec368d2< d9a0af9e43416aa50c0595e15fa01365a1c72c49 affected
9291747f118d6404e509747b85ff5f6dfec368d2< 1cd6313c8644bfebbd813a05da9daa21b09dd68c affected
9291747f118d6404e509747b85ff5f6dfec368d2< f00ac65c90ea475719e08d629e2e26c8b4e6999b affected
9291747f118d6404e509747b85ff5f6dfec368d2< e7e1b6bcb389c8708003d40613a59ff2496f6b1f affected
9291747f118d6404e509747b85ff5f6dfec368d2< dc3e27dd7d76e21106b8f9bbdc31f5da74a89014 affected
9291747f118d6404e509747b85ff5f6dfec368d2< 3e79374b03bf9a2f282f0eb1d0ac3776f7e0f28a affected
9291747f118d6404e509747b85ff5f6dfec368d2< 3d5d488f11776738deab9da336038add95d342d1 affected
… +10 more rows
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I. Basic Information for CVE-2026-31424

Vulnerability Information
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Vulnerability Title
netfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP Weiming Shi says: xt_match and xt_target structs registered with NFPROTO_UNSPEC can be loaded by any protocol family through nft_compat. When such a match/target sets .hooks to restrict which hooks it may run on, the bitmask uses NF_INET_* constants. This is only correct for families whose hook layout matches NF_INET_*: IPv4, IPv6, INET, and bridge all share the same five hooks (PRE_ROUTING ... POST_ROUTING). ARP only has three hooks (IN=0, OUT=1, FORWARD=2) with different semantics. Because NF_ARP_OUT == 1 == NF_INET_LOCAL_IN, the .hooks validation silently passes for the wrong reasons, allowing matches to run on ARP chains where the hook assumptions (e.g. state->in being set on input hooks) do not hold. This leads to NULL pointer dereferences; xt_devgroup is one concrete example: Oops: general protection fault, probably for non-canonical address 0xdffffc0000000044: 0000 [#1] SMP KASAN NOPTI KASAN: null-ptr-deref in range [0x0000000000000220-0x0000000000000227] RIP: 0010:devgroup_mt+0xff/0x350 Call Trace: <TASK> nft_match_eval (net/netfilter/nft_compat.c:407) nft_do_chain (net/netfilter/nf_tables_core.c:285) nft_do_chain_arp (net/netfilter/nft_chain_filter.c:61) nf_hook_slow (net/netfilter/core.c:623) arp_xmit (net/ipv4/arp.c:666) </TASK> Kernel panic - not syncing: Fatal exception in interrupt Fix it by restricting arptables to NFPROTO_ARP extensions only. Note that arptables-legacy only supports: - arpt_CLASSIFY - arpt_mangle - arpt_MARK that provide explicit NFPROTO_ARP match/target declarations.
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xt_check_match/xt_check_target扩展对NFPROTO_ARP的限制不当，可能导致空指针取消引用。
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 9291747f118d6404e509747b85ff5f6dfec368d2 ~ 80e3c75f71c3ea1e62fcb032382de13e00a68f8b -
Linux Linux 2.6.39 -

II. Public POCs for CVE-2026-31424

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III. Intelligence Information for CVE-2026-31424

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Same Patch Batch · Linux · 2026-04-13 · 15 CVEs total

CVE-2026-31414 9.8 CRITICAL netfilter: nf_conntrack_expect: use expect->helper
CVE-2026-31419 7.8 HIGH net: bonding: fix use-after-free in bond_xmit_broadcast()
CVE-2026-31417 7.5 HIGH net/x25: Fix overflow when accumulating packets
CVE-2026-31426 7.0 HIGH ACPI: EC: clean up handlers on probe failure in acpi_ec_setup()
CVE-2026-31428 netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD
CVE-2026-31427 netfilter: nf_conntrack_sip: fix use of uninitialized rtp_addr in process_sdp
CVE-2026-31425 rds: ib: reject FRMR registration before IB connection is established
CVE-2026-31423 net/sched: sch_hfsc: fix divide-by-zero in rtsc_min()
CVE-2026-31422 net/sched: cls_flow: fix NULL pointer dereference on shared blocks
CVE-2026-31420 bridge: mrp: reject zero test interval to avoid OOM panic
CVE-2026-31421 net/sched: cls_fw: fix NULL pointer dereference on shared blocks
CVE-2026-31418 netfilter: ipset: drop logically empty buckets in mtype_del
CVE-2026-31416 netfilter: nfnetlink_log: account for netlink header size
CVE-2026-31415 ipv6: avoid overflows in ip6_datagram_send_ctl()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31424

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