CVE-2026-99285 (GCVE-0-2026-99285)

Vulnerability from cvelistv5 – Published: 2026-11-10 17:37 – Updated: 2026-11-10 17:37
VLAI
Title
netfilter: nft_byteorder: remove multi-register support
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_byteorder: remove multi-register support 64bit byteorder conversion is broken when several registers need to be converted because the source register array advances in steps for 4 bytes instead of 8: for (i = ... src64 = nft_reg_load64(&src[i]); ~~~~~ u32 *src nft_reg_store64(&dst64[i], Remove the multi-register support, it has other issues as well: Pablo points out that commit caf3ef7468f7 ("netfilter: nf_tables: prevent OOB access in nft_byteorder_eval") alters semantics: before the loop operated on registers, i.e. for ( ... ) dst32[i] = htons((u16)src32[i]) .. but after the patch it will operate on bytes, which makes this useless to convert e.g. concatenations, which store each compound in its own register. Multi-convert of u32 has one theoretical application: ct mark . meta mark . tcp dport @intervalset Because ct mark and meta mark are host byte order, use with intervals has to convert the byteorder for ct/meta mark value to network byte order (bigendian). nftables emits this: [ meta load mark => reg 1 ] [ byteorder reg 1 = hton(reg 1, 4, 4) ] [ ct load mark => reg 9 ] [ byteorder reg 9 = hton(reg 9, 4, 4) ] ... I.e. two separate calls. Theoretically it could be changed to do: [ meta load mark => reg 1 ] [ ct load mark => reg 9 ] [ byteorder reg 1 = htonl(reg 1, 4, 8) ] ... But then all it would take to change the set to meta mark . tcp dport . ct mark ... and we'd be back to two "byteorder" calls. IOW, support to convert a range of registers is both dysfunctional and dubious. Simplify this: remove the feature. Pablo Neira Ayuso points out that nftables before 1.1.0 can generate incorrect byteorder conversions, see 9fe58952c45a, "evaluate: skip byteorder conversion for selector smaller than 2 bytes" in nftables.git). Affected rulesets fail to load with this change and old userspace due to 'len != size' check.
Severity
No CVSS data available.
Assigner
Linux CNA
References
Impacted products
Vendor Product Version
Linux Linux Affected: c301f0981fdd3fd1ffac6836b423c4d7a8e0eb63 , < 3c5fb3a6c8118d15e60295e76fb5b879021eef43 (git)
Affected: c301f0981fdd3fd1ffac6836b423c4d7a8e0eb63 , < dc29c0478b8564feb9371e715b5a0016eb8903fd (git)
Affected: c301f0981fdd3fd1ffac6836b423c4d7a8e0eb63 , < bb061d3de41707415269be75ebf700efb03ec212 (git)
Affected: fca41e5b687e029f69e3a35a2fa31e2560e538dc (git)
Affected: 25b42be4e067e107a2559266b54bf07fa5b094fb (git)
Affected: 9a865a11d6890d4a789db1eaafebdc8bd092b12c (git)
Affected: b8b514b2a6cdfac24911e4910461bcb9db15ca8d (git)
Affected: 18a169810cff769a7a697b35058c756805f589e0 (git)
Affected: 1a605657adc58b3c8e2c1c66aaa5fecd29072135 (git)
Affected: 013deed31ab15ef287b0045e4e7bd8f250e75b94 (git)
Affected: 4.19.307 , < 4.20 (semver)
Affected: 5.4.269 , < 5.5 (semver)
Affected: 5.10.210 , < 5.11 (semver)
Affected: 5.15.140 , < 5.16 (semver)
Affected: 6.1.64 , < 6.2 (semver)
Affected: 6.5.13 , < 6.6 (semver)
Affected: 6.6.3 , < 6.7 (semver)
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Linux Linux Affected: 6.7
Unaffected: 0 , < 6.7 (semver)
Unaffected: 6.12.115 , ≤ 6.12.* (semver)
Unaffected: 6.18.59 , ≤ 6.18.* (semver)
Unaffected: 7.1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nft_byteorder.c"
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              "versionType": "git"
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              "versionType": "git"
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            {
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              "version": "25b42be4e067e107a2559266b54bf07fa5b094fb",
              "versionType": "git"
            },
            {
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              "version": "9a865a11d6890d4a789db1eaafebdc8bd092b12c",
              "versionType": "git"
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            },
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              "version": "18a169810cff769a7a697b35058c756805f589e0",
              "versionType": "git"
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              "version": "1a605657adc58b3c8e2c1c66aaa5fecd29072135",
              "versionType": "git"
            },
            {
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              "lessThan": "5.11",
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              "versionType": "semver"
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              "lessThan": "5.16",
              "status": "affected",
              "version": "5.15.140",
              "versionType": "semver"
            },
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              "lessThan": "6.2",
              "status": "affected",
              "version": "6.1.64",
              "versionType": "semver"
            },
            {
              "lessThan": "6.6",
              "status": "affected",
              "version": "6.5.13",
              "versionType": "semver"
            },
            {
              "lessThan": "6.7",
              "status": "affected",
              "version": "6.6.3",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.7"
            },
            {
              "lessThan": "6.7",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.115",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.59",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
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              "cpeMatch": [
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              "negate": false,
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nft_byteorder: remove multi-register support\n\n64bit byteorder conversion is broken when several registers need to be\nconverted because the source register array advances in steps for 4 bytes\ninstead of 8:\n\n  for (i = ...\n      src64 = nft_reg_load64(\u0026src[i]);\n                             ~~~~~ u32 *src\n      nft_reg_store64(\u0026dst64[i],\n\nRemove the multi-register support, it has other issues as well:\n\nPablo points out that commit\ncaf3ef7468f7 (\"netfilter: nf_tables: prevent OOB access in nft_byteorder_eval\")\nalters semantics: before the loop operated on registers, i.e.\n for ( ... )\n   dst32[i] = htons((u16)src32[i])\n\n .. but after the patch it will operate on bytes, which makes this\n useless to convert e.g. concatenations, which store each compound\n in its own register.\n\nMulti-convert of u32 has one theoretical application:\n\nct mark . meta mark . tcp dport @intervalset\n\nBecause ct mark and meta mark are host byte order, use with\nintervals has to convert the byteorder for ct/meta mark value\nto network byte order (bigendian).\n\nnftables emits this:\n [ meta load mark =\u003e reg 1 ]\n [ byteorder reg 1 = hton(reg 1, 4, 4) ]\n [ ct load mark =\u003e reg 9 ]\n [ byteorder reg 9 = hton(reg 9, 4, 4) ]\n ...\n\nI.e. two separate calls.  Theoretically it could be changed to do:\n [ meta load mark =\u003e reg 1 ]\n [ ct load mark =\u003e reg 9 ]\n [ byteorder reg 1 = htonl(reg 1, 4, 8) ]\n ...\n\nBut then all it would take to change the set to\nmeta mark . tcp dport . ct mark\n\n... and we\u0027d be back to two \"byteorder\" calls. IOW, support to\nconvert a range of registers is both dysfunctional and dubious.\n\nSimplify this: remove the feature.\n\nPablo Neira Ayuso points out that nftables before 1.1.0 can generate\nincorrect byteorder conversions, see 9fe58952c45a,\n\"evaluate: skip byteorder conversion for selector smaller than 2 bytes\"\nin nftables.git).  Affected rulesets fail to load with this change and\nold userspace due to \u0027len != size\u0027 check."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-11-10T17:37:13.348Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/3c5fb3a6c8118d15e60295e76fb5b879021eef43"
        },
        {
          "url": "https://git.kernel.org/stable/c/dc29c0478b8564feb9371e715b5a0016eb8903fd"
        },
        {
          "url": "https://git.kernel.org/stable/c/bb061d3de41707415269be75ebf700efb03ec212"
        }
      ],
      "title": "netfilter: nft_byteorder: remove multi-register support",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99285",
    "datePublished": "2026-11-10T17:37:13.348Z",
    "dateReserved": "2026-09-25T10:25:14.405Z",
    "dateUpdated": "2026-11-10T17:37:13.348Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}



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