CVE-2022-49698 (GCVE-0-2022-49698)
Vulnerability from cvelistv5
Published
2025-02-26 02:24
Modified
2025-05-04 08:43
Severity ?
Summary
In the Linux kernel, the following vulnerability has been resolved: netfilter: use get_random_u32 instead of prandom bh might occur while updating per-cpu rnd_state from user context, ie. local_out path. BUG: using smp_processor_id() in preemptible [00000000] code: nginx/2725 caller is nft_ng_random_eval+0x24/0x54 [nft_numgen] Call Trace: check_preemption_disabled+0xde/0xe0 nft_ng_random_eval+0x24/0x54 [nft_numgen] Use the random driver instead, this also avoids need for local prandom state. Moreover, prandom now uses the random driver since d4150779e60f ("random32: use real rng for non-deterministic randomness"). Based on earlier patch from Pablo Neira.
References
Impacted products
Vendor Product Version
Linux Linux Version: 978d8f9055c3a7c35db2ac99cd2580b993396e33
Version: 978d8f9055c3a7c35db2ac99cd2580b993396e33
Version: 978d8f9055c3a7c35db2ac99cd2580b993396e33
Version: 978d8f9055c3a7c35db2ac99cd2580b993396e33
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "net/netfilter/nft_meta.c",
            "net/netfilter/nft_numgen.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
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            "net/netfilter/nft_numgen.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "4.18"
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            {
              "lessThan": "4.18",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.10.*",
              "status": "unaffected",
              "version": "5.10.127",
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            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.51",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.18.*",
              "status": "unaffected",
              "version": "5.18.8",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "5.19",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
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          "nodes": [
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              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                  "versionStartIncluding": "4.18",
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              "negate": false,
              "operator": "OR"
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        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnetfilter: use get_random_u32 instead of prandom\n\nbh might occur while updating per-cpu rnd_state from user context,\nie. local_out path.\n\nBUG: using smp_processor_id() in preemptible [00000000] code: nginx/2725\ncaller is nft_ng_random_eval+0x24/0x54 [nft_numgen]\nCall Trace:\n check_preemption_disabled+0xde/0xe0\n nft_ng_random_eval+0x24/0x54 [nft_numgen]\n\nUse the random driver instead, this also avoids need for local prandom\nstate. Moreover, prandom now uses the random driver since d4150779e60f\n(\"random32: use real rng for non-deterministic randomness\").\n\nBased on earlier patch from Pablo Neira."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2025-05-04T08:43:30.726Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/15cc30ac2a8d7185f8ebf97dd1ddd90a7c79783b"
        },
        {
          "url": "https://git.kernel.org/stable/c/d0906b0fffc9f19bc42708ca3e84e2089088386c"
        },
        {
          "url": "https://git.kernel.org/stable/c/6ce71f83f798be7e1ca68707fec449fbecb38852"
        },
        {
          "url": "https://git.kernel.org/stable/c/b1fd94e704571f98b21027340eecf821b2bdffba"
        }
      ],
      "title": "netfilter: use get_random_u32 instead of prandom",
      "x_generator": {
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    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2022-49698",
    "datePublished": "2025-02-26T02:24:19.519Z",
    "dateReserved": "2025-02-26T02:21:30.443Z",
    "dateUpdated": "2025-05-04T08:43:30.726Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.1",
  "vulnerability-lookup:meta": {
    "nvd": "{\"cve\":{\"id\":\"CVE-2022-49698\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2025-02-26T07:01:44.547\",\"lastModified\":\"2025-02-26T07:01:44.547\",\"vulnStatus\":\"Awaiting Analysis\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nnetfilter: use get_random_u32 instead of prandom\\n\\nbh might occur while updating per-cpu rnd_state from user context,\\nie. local_out path.\\n\\nBUG: using smp_processor_id() in preemptible [00000000] code: nginx/2725\\ncaller is nft_ng_random_eval+0x24/0x54 [nft_numgen]\\nCall Trace:\\n check_preemption_disabled+0xde/0xe0\\n nft_ng_random_eval+0x24/0x54 [nft_numgen]\\n\\nUse the random driver instead, this also avoids need for local prandom\\nstate. Moreover, prandom now uses the random driver since d4150779e60f\\n(\\\"random32: use real rng for non-deterministic randomness\\\").\\n\\nBased on earlier patch from Pablo Neira.\"},{\"lang\":\"es\",\"value\":\"En el kernel de Linux, se ha resuelto la siguiente vulnerabilidad: netfilter: el uso de get_random_u32 en lugar de prandom bh podr\u00eda ocurrir mientras se actualiza rnd_state por CPU desde el contexto del usuario, es decir, la ruta local_out. ERROR: uso de smp_processor_id() en c\u00f3digo preemptible [00000000]: el llamador de nginx/2725 es nft_ng_random_eval+0x24/0x54 [nft_numgen] Rastreo de llamadas: check_preemption_disabled+0xde/0xe0 nft_ng_random_eval+0x24/0x54 [nft_numgen] Use el controlador aleatorio en su lugar, esto tambi\u00e9n evita la necesidad de un estado prandom local. Adem\u00e1s, prandom ahora usa el controlador aleatorio desde d4150779e60f (\\\"random32: use real rng for non-deterministic randomness\\\"). Basado en un parche anterior de Pablo Neira.\"}],\"metrics\":{},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/15cc30ac2a8d7185f8ebf97dd1ddd90a7c79783b\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6ce71f83f798be7e1ca68707fec449fbecb38852\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b1fd94e704571f98b21027340eecf821b2bdffba\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d0906b0fffc9f19bc42708ca3e84e2089088386c\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}"
  }
}


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