FKIE_CVE-2024-42109

Vulnerability from fkie_nvd - Published: 2024-07-30 08:15 - Updated: 2026-06-17 07:48
Severity
5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: unconditionally flush pending work before notifier syzbot reports: KASAN: slab-uaf in nft_ctx_update include/net/netfilter/nf_tables.h:1831 KASAN: slab-uaf in nft_commit_release net/netfilter/nf_tables_api.c:9530 KASAN: slab-uaf int nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597 Read of size 2 at addr ffff88802b0051c4 by task kworker/1:1/45 [..] Workqueue: events nf_tables_trans_destroy_work Call Trace: nft_ctx_update include/net/netfilter/nf_tables.h:1831 [inline] nft_commit_release net/netfilter/nf_tables_api.c:9530 [inline] nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597 Problem is that the notifier does a conditional flush, but its possible that the table-to-be-removed is still referenced by transactions being processed by the worker, so we need to flush unconditionally. We could make the flush_work depend on whether we found a table to delete in nf-next to avoid the flush for most cases. AFAICS this problem is only exposed in nf-next, with commit e169285f8c56 ("netfilter: nf_tables: do not store nft_ctx in transaction objects"), with this commit applied there is an unconditional fetch of table->family which is whats triggering the above splat.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/09e650c3a3a7d804430260510534ccbf71c75b2ePatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/3325628cb36b7f216c5716e7b5124d9dc81199e4Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/4c06c13317b9a08decedcd7aaf706691e336277cPatch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/55a40406aac555defe9bdd0adec9508116ce7cb1Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/9f6958ba2e902f9820c594869bd710ba74b7c4c0Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/09e650c3a3a7d804430260510534ccbf71c75b2ePatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/3325628cb36b7f216c5716e7b5124d9dc81199e4Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/4c06c13317b9a08decedcd7aaf706691e336277cPatch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/55a40406aac555defe9bdd0adec9508116ce7cb1Patch
af854a3a-2127-422b-91ae-364da2661108https://git.kernel.org/stable/c/9f6958ba2e902f9820c594869bd710ba74b7c4c0Patch
af854a3a-2127-422b-91ae-364da2661108https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Impacted products
Vendor Product Version
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
linux linux_kernel *
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_tables_api.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "3325628cb36b7f216c5716e7b5124d9dc81199e4",
              "status": "affected",
              "version": "f22954f8c58fd5f5489f5980796914e306757e77",
              "versionType": "git"
            },
            {
              "lessThan": "4c06c13317b9a08decedcd7aaf706691e336277c",
              "status": "affected",
              "version": "41841b585e53babdfb0fa6fdfa54f6d7c28c1206",
              "versionType": "git"
            },
            {
              "lessThan": "55a40406aac555defe9bdd0adec9508116ce7cb1",
              "status": "affected",
              "version": "2c9f0293280e258606e54ed2b96fa71498432eae",
              "versionType": "git"
            },
            {
              "lessThan": "09e650c3a3a7d804430260510534ccbf71c75b2e",
              "status": "affected",
              "version": "2c9f0293280e258606e54ed2b96fa71498432eae",
              "versionType": "git"
            },
            {
              "lessThan": "9f6958ba2e902f9820c594869bd710ba74b7c4c0",
              "status": "affected",
              "version": "2c9f0293280e258606e54ed2b96fa71498432eae",
              "versionType": "git"
            },
            {
              "status": "affected",
              "version": "4167aa477abcf62b0dfda51f3513280fa73cd588",
              "versionType": "git"
            },
            {
              "lessThan": "5.15.163",
              "status": "affected",
              "version": "5.15.129",
              "versionType": "semver"
            },
            {
              "lessThan": "6.1.98",
              "status": "affected",
              "version": "6.1.50",
              "versionType": "semver"
            },
            {
              "lessThan": "6.5",
              "status": "affected",
              "version": "6.4.13",
              "versionType": "semver"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nf_tables_api.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.5"
            },
            {
              "lessThan": "6.5",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.163",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.98",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.39",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.9.*",
              "status": "unaffected",
              "version": "6.9.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "6.10",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "configurations": [
    {
      "nodes": [
        {
          "cpeMatch": [
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "5FD25434-47C3-45B8-B46A-6352379CD2F9",
              "versionEndExcluding": "5.15.163",
              "versionStartIncluding": "5.15.129",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "24E84470-CB41-4B10-ACC2-6579459F3A48",
              "versionEndExcluding": "6.1.98",
              "versionStartIncluding": "6.1.50",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "E079242F-1B25-40DA-BCE2-2A7965C9168E",
              "versionEndExcluding": "6.6.39",
              "versionStartIncluding": "6.5",
              "vulnerable": true
            },
            {
              "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
              "matchCriteriaId": "ADCC1407-0CB3-4C8F-B4C5-07F682CD7085",
              "versionEndExcluding": "6.9.9",
              "versionStartIncluding": "6.7",
              "vulnerable": true
            }
          ],
          "negate": false,
          "operator": "OR"
        }
      ]
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: nf_tables: unconditionally flush pending work before notifier\n\nsyzbot reports:\n\nKASAN: slab-uaf in nft_ctx_update include/net/netfilter/nf_tables.h:1831\nKASAN: slab-uaf in nft_commit_release net/netfilter/nf_tables_api.c:9530\nKASAN: slab-uaf int nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597\nRead of size 2 at addr ffff88802b0051c4 by task kworker/1:1/45\n[..]\nWorkqueue: events nf_tables_trans_destroy_work\nCall Trace:\n nft_ctx_update include/net/netfilter/nf_tables.h:1831 [inline]\n nft_commit_release net/netfilter/nf_tables_api.c:9530 [inline]\n nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597\n\nProblem is that the notifier does a conditional flush, but its possible\nthat the table-to-be-removed is still referenced by transactions being\nprocessed by the worker, so we need to flush unconditionally.\n\nWe could make the flush_work depend on whether we found a table to delete\nin nf-next to avoid the flush for most cases.\n\nAFAICS this problem is only exposed in nf-next, with\ncommit e169285f8c56 (\"netfilter: nf_tables: do not store nft_ctx in transaction objects\"),\nwith this commit applied there is an unconditional fetch of\ntable-\u003efamily which is whats triggering the above splat."
    },
    {
      "lang": "es",
      "value": "En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: nf_tables: vaciar incondicionalmente el trabajo pendiente antes de que el notificador syzbot informe: KASAN: slab-uaf en nft_ctx_update include/net/netfilter/nf_tables.h:1831 KASAN: slab-uaf en nft_commit_release net/netfilter/nf_tables_api.c:9530 KASAN: slab-uaf int nf_tables_trans_destroy_work+0x152b/0x1750 net/netfilter/nf_tables_api.c:9597 Lectura de tama\u00f1o 2 en la direcci\u00f3n ffff88802b0051c4 por tarea kworker/1:1/45 [..] ue : eventos nf_tables_trans_destroy_work Seguimiento de llamadas: nft_ctx_update include/net/netfilter/nf_tables.h:1831 [en l\u00ednea] nft_commit_release net/netfilter/nf_tables_api.c:9530 [en l\u00ednea] nf_tables_trans_destroy_work+0x152b/0x1750 s_api.c:9597 El problema es que el notificador realiza un vaciado condicional, pero es posible que las transacciones que procesa el trabajador a\u00fan hagan referencia a la tabla que se va a eliminar, por lo que debemos realizar un vaciado incondicional. Podr\u00edamos hacer que flux_work dependa de si encontramos una tabla para eliminar en nf-next para evitar el vaciado en la mayor\u00eda de los casos. AFAICS, este problema solo se expone en nf-next, con la confirmaci\u00f3n e169285f8c56 (\"netfilter: nf_tables: no almacenar nft_ctx en objetos de transacci\u00f3n\"), con esta confirmaci\u00f3n aplicada hay una b\u00fasqueda incondicional de tabla-\u0026gt;familia que es lo que desencadena lo anterior salpicar."
    }
  ],
  "id": "CVE-2024-42109",
  "lastModified": "2026-06-17T07:48:51.273",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 5.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 3.6,
        "source": "nvd@nist.gov",
        "type": "Primary"
      }
    ],
    "ssvcV203": [
      {
        "source": "134c704f-9b21-4f2e-91b3-4a467353bcc0",
        "ssvcData": {
          "id": "CVE-2024-42109",
          "options": [
            {
              "exploitation": "none"
            },
            {
              "automatable": "no"
            },
            {
              "technicalImpact": "partial"
            }
          ],
          "role": "CISA Coordinator",
          "timestamp": "2024-09-10T16:17:36.218121Z",
          "version": "2.0.3"
        }
      }
    ]
  },
  "published": "2024-07-30T08:15:03.407",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/09e650c3a3a7d804430260510534ccbf71c75b2e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3325628cb36b7f216c5716e7b5124d9dc81199e4"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/4c06c13317b9a08decedcd7aaf706691e336277c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/55a40406aac555defe9bdd0adec9508116ce7cb1"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/9f6958ba2e902f9820c594869bd710ba74b7c4c0"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/09e650c3a3a7d804430260510534ccbf71c75b2e"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/3325628cb36b7f216c5716e7b5124d9dc81199e4"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/4c06c13317b9a08decedcd7aaf706691e336277c"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/55a40406aac555defe9bdd0adec9508116ce7cb1"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "tags": [
        "Patch"
      ],
      "url": "https://git.kernel.org/stable/c/9f6958ba2e902f9820c594869bd710ba74b7c4c0"
    },
    {
      "source": "af854a3a-2127-422b-91ae-364da2661108",
      "url": "https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
    {
      "description": [
        {
          "lang": "en",
          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    }
  ]
}


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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

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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.