CVE-2026-43114 (GCVE-0-2026-43114)
Vulnerability from cvelistv5
Published
2026-05-06 07:40
Modified
2026-10-19 19:06
Severity ?
9.4 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry New test case fails unexpectedly when avx2 matching functions are used. The test first loads a ranomly generated pipapo set with 'ipv4 . port' key, i.e. nft -f foo. This works. Then, it reloads the set after a flush: (echo flush set t s; cat foo) | nft -f - This is expected to work, because its the same set after all and it was already loaded once. But with avx2, this fails: nft reports a clashing element. The reported clash is of following form: We successfully re-inserted a . b c . d Then we try to insert a . d avx2 finds the already existing a . d, which (due to 'flush set') is marked as invalid in the new generation. It skips the element and moves to next. Due to incorrect masking, the skip-step finds the next matching element *only considering the first field*, i.e. we return the already reinserted "a . b", even though the last field is different and the entry should not have been matched. No such error is reported for the generic c implementation (no avx2) or when the last field has to use the 'nft_pipapo_avx2_lookup_slow' fallback. Bisection points to 7711f4bb4b36 ("netfilter: nft_set_pipapo: fix range overlap detection") but that fix merely uncovers this bug. Before this commit, the wrong element is returned, but erronously reported as a full, identical duplicate. The root-cause is too early return in the avx2 match functions. When we process the last field, we should continue to process data until the entire input size has been consumed to make sure no stale bits remain in the map.
References
Impacted products
Vendor Product Version
Linux Linux Version: 7400b063969bdca4a06cd97f1294d765c8eecbe1
Version: 7400b063969bdca4a06cd97f1294d765c8eecbe1
Version: 7400b063969bdca4a06cd97f1294d765c8eecbe1
Version: 7400b063969bdca4a06cd97f1294d765c8eecbe1
Version: 7400b063969bdca4a06cd97f1294d765c8eecbe1
Version: 7400b063969bdca4a06cd97f1294d765c8eecbe1
Version: 7400b063969bdca4a06cd97f1294d765c8eecbe1
Version: 7400b063969bdca4a06cd97f1294d765c8eecbe1
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_set_pipapo_avx2: don\u0027t return non-matching entry on expiry\n\nNew test case fails unexpectedly when avx2 matching functions are used.\n\nThe test first loads a ranomly generated pipapo set\nwith \u0027ipv4 . port\u0027 key, i.e.  nft -f foo.\n\nThis works.  Then, it reloads the set after a flush:\n(echo flush set t s; cat foo) | nft -f -\n\nThis is expected to work, because its the same set after all and it was\nalready loaded once.\n\nBut with avx2, this fails: nft reports a clashing element.\n\nThe reported clash is of following form:\n\n    We successfully re-inserted\n      a . b\n      c . d\n\nThen we try to insert a . d\n\navx2 finds the already existing a . d, which (due to \u0027flush set\u0027) is marked\nas invalid in the new generation.  It skips the element and moves to next.\n\nDue to incorrect masking, the skip-step finds the next matching\nelement *only considering the first field*,\n\ni.e. we return the already reinserted \"a . b\", even though the\nlast field is different and the entry should not have been matched.\n\nNo such error is reported for the generic c implementation (no avx2) or when\nthe last field has to use the \u0027nft_pipapo_avx2_lookup_slow\u0027 fallback.\n\nBisection points to\n7711f4bb4b36 (\"netfilter: nft_set_pipapo: fix range overlap detection\")\nbut that fix merely uncovers this bug.\n\nBefore this commit, the wrong element is returned, but erronously\nreported as a full, identical duplicate.\n\nThe root-cause is too early return in the avx2 match functions.\nWhen we process the last field, we should continue to process data\nuntil the entire input size has been consumed to make sure no stale\nbits remain in the map."
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[\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:62640\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}, {\"url\": \"https://access.redhat.com/errata/RHSA-2026:67721\", \"tags\": [\"vendor-advisory\", \"x_refsource_REDHAT\"]}], \"workarounds\": [{\"lang\": \"en\", \"value\": \"Mitigation for this issue is either not available or the currently available options do not meet the Red Hat Product Security criteria comprising ease of use and deployment, applicability to widespread installation base, or stability.\"}], \"x_generator\": {\"engine\": \"sadp-cli 1.0.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"A flaw was found in the Linux kernel\u0027s netfilter component, specifically within the `nft_set_pipapo_avx2` AVX2 matching functions. This vulnerability occurs when a `pipapo` set with an \u0027ipv4 . port\u0027 key is reloaded. Due to incorrect masking, the system may erroneously identify non-matching elements as duplicates, leading to data integrity issues and unexpected behavior. A remote attacker could potentially exploit this to cause a denial of service or impact data integrity.\"}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-480\", \"description\": \"Use of Incorrect Operator\"}]}], \"providerMetadata\": {\"orgId\": \"0b0ca135-0b70-47e7-9f44-1890c2a1c46c\", \"shortName\": \"redhat-SADP\", \"dateUpdated\": \"2026-09-17T12:04:37.048Z\"}}, {\"affected\": [{\"vendor\": \"Siemens\", \"product\": \"SIMATIC S7-1500 TM MFP - GNU/Linux subsystem\", \"versions\": [{\"status\": \"affected\", \"version\": \"0\", \"lessThan\": \"*\", \"versionType\": \"custom\"}], \"defaultStatus\": \"unknown\"}], \"x_adpType\": \"supplier\", \"references\": [{\"url\": \"https://cert-portal.siemens.com/productcert/html/ssa-784472.html\"}], \"providerMetadata\": {\"orgId\": \"0b142b55-0307-4c5a-b3c9-f314f3fb7c5e\", \"shortName\": \"siemens-SADP\", \"dateUpdated\": \"2026-10-15T01:19:12.926Z\"}}, {\"title\": \"CISA ADP Vulnrichment\", \"metrics\": [{\"other\": {\"type\": \"ssvc\", \"content\": {\"id\": \"CVE-2026-43114\", \"role\": \"CISA Coordinator\", \"options\": [{\"Exploitation\": \"none\"}, {\"Automatable\": \"yes\"}, {\"Technical Impact\": \"total\"}], \"version\": \"2.0.3\", \"timestamp\": \"2026-10-16T15:14:45.186555Z\"}}}], \"problemTypes\": [{\"descriptions\": [{\"lang\": \"en\", \"type\": \"CWE\", \"cweId\": \"CWE-20\", \"description\": \"CWE-20 Improper Input Validation\"}]}], \"providerMetadata\": {\"orgId\": \"134c704f-9b21-4f2e-91b3-4a467353bcc0\", \"shortName\": \"CISA-ADP\", \"dateUpdated\": \"2026-10-16T15:14:45.783Z\"}}], \"cna\": {\"title\": \"netfilter: nft_set_pipapo_avx2: don\u0027t return non-matching entry on expiry\", \"metrics\": [{\"cvssV3_1\": {\"version\": \"3.1\", \"baseScore\": 9.4, \"baseSeverity\": \"CRITICAL\", \"vectorString\": \"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:L\"}, \"scenarios\": [{\"lang\": \"en\", \"value\": \"AV:N - Although nftables configuration is local, the vulnerable AVX2 pipapo lookup is also used from nftables packet hooks, so a received network packet can exercise it in a deployed firewall ruleset.\\nAC:L - No race, memory-layout dependency, or probabilistic condition is required once an affected AVX2 interval/concatenated set with expired or inactive entries exists; the attacker controls the packet key values used for lookup.\\nPR:N - A remote packet sender does not need nftables privileges or authentication to trigger the packet-path lookup in an already configured firewall.\\nUI:N - No victim user action is needed; packet processing and set lookup occur automatically in the kernel netfilter hook path.\\nS:U - The impact remains within the kernel/network filtering security authority and does not cross a VM, IOMMU, or separate sandbox boundary.\\nC:H - The bug can falsely match a non-matching set element after an expired or inactive element is skipped, which can bypass firewall policy and expose services or traffic that should have been unreachable.\\nI:H - A false nftables set match can select the wrong verdict or map data, allowing unauthorized traffic/action contrary to the intended firewall policy.\\nA:L - The same wrong-match behavior can cause legitimate nftables updates to fail with false element clashes or can misclassify selected traffic, but it is not a kernel crash, hang, or memory corruption.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"7400b063969bdca4a06cd97f1294d765c8eecbe1\", \"lessThan\": \"f8c39983fc9c1a978c82e6f2df7bfba8a8561587\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7400b063969bdca4a06cd97f1294d765c8eecbe1\", \"lessThan\": \"c7babe2f28b507e17f28e9f753b7caec72d4857f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7400b063969bdca4a06cd97f1294d765c8eecbe1\", \"lessThan\": \"1c43f0dd8691ddf8884793b481ddc7511cf593c3\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7400b063969bdca4a06cd97f1294d765c8eecbe1\", \"lessThan\": \"fa4f1f52528c73989d820f32bfca06bec5afeece\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7400b063969bdca4a06cd97f1294d765c8eecbe1\", \"lessThan\": \"3d53f9aafd469ae1ea27051e00f5b96ca1b55d52\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7400b063969bdca4a06cd97f1294d765c8eecbe1\", \"lessThan\": \"07de44424bb7f17ef9357e8535df96d9e97c40cb\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7400b063969bdca4a06cd97f1294d765c8eecbe1\", \"lessThan\": \"0abbc43f71d99baadeeba6fa3fe1c80b676f57ed\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"7400b063969bdca4a06cd97f1294d765c8eecbe1\", \"lessThan\": \"d3c0037ffe1273fa1961e779ff6906234d6cf53c\", \"versionType\": \"git\"}], \"programFiles\": [\"net/netfilter/nft_set_pipapo_avx2.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"5.7\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"5.7\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.258\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.209\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.175\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.136\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.83\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.24\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"6.19.14\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.19.*\"}, {\"status\": \"unaffected\", \"version\": \"7.0\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"net/netfilter/nft_set_pipapo_avx2.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/f8c39983fc9c1a978c82e6f2df7bfba8a8561587\"}, {\"url\": \"https://git.kernel.org/stable/c/c7babe2f28b507e17f28e9f753b7caec72d4857f\"}, {\"url\": \"https://git.kernel.org/stable/c/1c43f0dd8691ddf8884793b481ddc7511cf593c3\"}, {\"url\": \"https://git.kernel.org/stable/c/fa4f1f52528c73989d820f32bfca06bec5afeece\"}, {\"url\": \"https://git.kernel.org/stable/c/3d53f9aafd469ae1ea27051e00f5b96ca1b55d52\"}, {\"url\": \"https://git.kernel.org/stable/c/07de44424bb7f17ef9357e8535df96d9e97c40cb\"}, {\"url\": \"https://git.kernel.org/stable/c/0abbc43f71d99baadeeba6fa3fe1c80b676f57ed\"}, {\"url\": \"https://git.kernel.org/stable/c/d3c0037ffe1273fa1961e779ff6906234d6cf53c\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: nft_set_pipapo_avx2: don\u0027t return non-matching entry on expiry\\n\\nNew test case fails unexpectedly when avx2 matching functions are used.\\n\\nThe test first loads a ranomly generated pipapo set\\nwith \u0027ipv4 . port\u0027 key, i.e.  nft -f foo.\\n\\nThis works.  Then, it reloads the set after a flush:\\n(echo flush set t s; cat foo) | nft -f -\\n\\nThis is expected to work, because its the same set after all and it was\\nalready loaded once.\\n\\nBut with avx2, this fails: nft reports a clashing element.\\n\\nThe reported clash is of following form:\\n\\n    We successfully re-inserted\\n      a . b\\n      c . d\\n\\nThen we try to insert a . d\\n\\navx2 finds the already existing a . d, which (due to \u0027flush set\u0027) is marked\\nas invalid in the new generation.  It skips the element and moves to next.\\n\\nDue to incorrect masking, the skip-step finds the next matching\\nelement *only considering the first field*,\\n\\ni.e. we return the already reinserted \\\"a . b\\\", even though the\\nlast field is different and the entry should not have been matched.\\n\\nNo such error is reported for the generic c implementation (no avx2) or when\\nthe last field has to use the \u0027nft_pipapo_avx2_lookup_slow\u0027 fallback.\\n\\nBisection points to\\n7711f4bb4b36 (\\\"netfilter: nft_set_pipapo: fix range overlap detection\\\")\\nbut that fix merely uncovers this bug.\\n\\nBefore this commit, the wrong element is returned, but erronously\\nreported as a full, identical duplicate.\\n\\nThe root-cause is too early return in the avx2 match functions.\\nWhen we process the last field, we should continue to process data\\nuntil the entire input size has been consumed to make sure no stale\\nbits remain in the map.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.258\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.209\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.175\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.136\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.83\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.24\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.19.14\", \"versionStartIncluding\": \"5.7\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.0\", \"versionStartIncluding\": \"5.7\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-08-05T12:26:01.768Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-43114\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T19:06:14.068Z\", \"dateReserved\": \"2026-05-01T14:12:55.986Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-05-06T07:40:39.877Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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