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
https://git.kernel.org/stable/c/15cc30ac2a8d7185f8ebf97dd1ddd90a7c79783b
https://git.kernel.org/stable/c/d0906b0fffc9f19bc42708ca3e84e2089088386c
https://git.kernel.org/stable/c/6ce71f83f798be7e1ca68707fec449fbecb38852
https://git.kernel.org/stable/c/b1fd94e704571f98b21027340eecf821b2bdffba
Impacted products
Vendor Product Version
Linux Linux Version: 978d8f9055c3a7c35db2ac99cd2580b993396e33
Version: 978d8f9055c3a7c35db2ac99cd2580b993396e33
Version: 978d8f9055c3a7c35db2ac99cd2580b993396e33
Version: 978d8f9055c3a7c35db2ac99cd2580b993396e33
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   Linux Linux Version: 4.18
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      "descriptions": [
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          "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."
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        "shortName": "Linux"
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      "title": "netfilter: use get_random_u32 instead of prandom",
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    "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"
  },
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  "dataVersion": "5.1"
}


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