CVE-2026-31424 (GCVE-0-2026-31424)

Vulnerability from cvelistv5 – Published: 2026-04-13 13:40 – Updated: 2026-07-14 12:47
VLAI
Title
netfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP
Summary
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.
Severity
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 9291747f118d6404e509747b85ff5f6dfec368d2 , < 80e3c75f71c3ea1e62fcb032382de13e00a68f8b (git)
Affected: 9291747f118d6404e509747b85ff5f6dfec368d2 , < d9a0af9e43416aa50c0595e15fa01365a1c72c49 (git)
Affected: 9291747f118d6404e509747b85ff5f6dfec368d2 , < 1cd6313c8644bfebbd813a05da9daa21b09dd68c (git)
Affected: 9291747f118d6404e509747b85ff5f6dfec368d2 , < f00ac65c90ea475719e08d629e2e26c8b4e6999b (git)
Affected: 9291747f118d6404e509747b85ff5f6dfec368d2 , < e7e1b6bcb389c8708003d40613a59ff2496f6b1f (git)
Affected: 9291747f118d6404e509747b85ff5f6dfec368d2 , < dc3e27dd7d76e21106b8f9bbdc31f5da74a89014 (git)
Affected: 9291747f118d6404e509747b85ff5f6dfec368d2 , < 3e79374b03bf9a2f282f0eb1d0ac3776f7e0f28a (git)
Affected: 9291747f118d6404e509747b85ff5f6dfec368d2 , < 3d5d488f11776738deab9da336038add95d342d1 (git)
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Linux Linux Affected: 2.6.39
Unaffected: 0 , < 2.6.39 (semver)
Unaffected: 5.10.253 , ≤ 5.10.* (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.168 , ≤ 6.1.* (semver)
Unaffected: 6.6.134 , ≤ 6.6.* (semver)
Unaffected: 6.12.81 , ≤ 6.12.* (semver)
Unaffected: 6.18.22 , ≤ 6.18.* (semver)
Unaffected: 6.19.12 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.6 , < * (custom)
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Siemens SIPLUS S7-1500 CPU 1518-4 PN/DP MFP Affected: V3.1.5 , < * (custom)
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Because NF_ARP_OUT == 1 == NF_INET_LOCAL_IN, the .hooks\\nvalidation silently passes for the wrong reasons, allowing matches to\\nrun on ARP chains where the hook assumptions (e.g. state-\u003ein being\\nset on input hooks) do not hold. This leads to NULL pointer\\ndereferences; xt_devgroup is one concrete example:\\n\\n Oops: general protection fault, probably for non-canonical address 0xdffffc0000000044: 0000 [#1] SMP KASAN NOPTI\\n KASAN: null-ptr-deref in range [0x0000000000000220-0x0000000000000227]\\n RIP: 0010:devgroup_mt+0xff/0x350\\n Call Trace:\\n  \u003cTASK\u003e\\n  nft_match_eval (net/netfilter/nft_compat.c:407)\\n  nft_do_chain (net/netfilter/nf_tables_core.c:285)\\n  nft_do_chain_arp (net/netfilter/nft_chain_filter.c:61)\\n  nf_hook_slow (net/netfilter/core.c:623)\\n  arp_xmit (net/ipv4/arp.c:666)\\n  \u003c/TASK\u003e\\n Kernel panic - not syncing: Fatal exception in interrupt\\n\\nFix it by restricting arptables to NFPROTO_ARP extensions only.\\nNote that arptables-legacy only supports:\\n\\n- arpt_CLASSIFY\\n- arpt_mangle\\n- arpt_MARK\\n\\nthat provide explicit NFPROTO_ARP match/target declarations.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"net/netfilter/x_tables.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"9291747f118d6404e509747b85ff5f6dfec368d2\",\"lessThan\":\"80e3c75f71c3ea1e62fcb032382de13e00a68f8b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9291747f118d6404e509747b85ff5f6dfec368d2\",\"lessThan\":\"d9a0af9e43416aa50c0595e15fa01365a1c72c49\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9291747f118d6404e509747b85ff5f6dfec368d2\",\"lessThan\":\"1cd6313c8644bfebbd813a05da9daa21b09dd68c\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9291747f118d6404e509747b85ff5f6dfec368d2\",\"lessThan\":\"f00ac65c90ea475719e08d629e2e26c8b4e6999b\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9291747f118d6404e509747b85ff5f6dfec368d2\",\"lessThan\":\"e7e1b6bcb389c8708003d40613a59ff2496f6b1f\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9291747f118d6404e509747b85ff5f6dfec368d2\",\"lessThan\":\"dc3e27dd7d76e21106b8f9bbdc31f5da74a89014\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9291747f118d6404e509747b85ff5f6dfec368d2\",\"lessThan\":\"3e79374b03bf9a2f282f0eb1d0ac3776f7e0f28a\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"9291747f118d6404e509747b85ff5f6dfec368d2\",\"lessThan\":\"3d5d488f11776738deab9da336038add95d342d1\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"net/netfilter/x_tables.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.39\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.39\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.253\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.203\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.168\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.134\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.81\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.22\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.19.12\",\"lessThanOrEqual\":\"6.19.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.0\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]},{\"source\":\"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\",\"affectedData\":[{\"vendor\":\"Siemens\",\"product\":\"SIMATIC 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    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-06-28T07:25:15+00:00",
      "cve": "CVE-2026-31424",
      "id": "CVE-2026-31424",
      "initial_release_date": "2026-04-13T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: netfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-31424.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.