CVE-2022-49698
N/A
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.
Affected Software
| Vendor | Product | Version Range | Status |
|---|---|---|---|
| Linux | Linux | 978d8f9055c3a7c35db2ac99cd2580b993396e33 < 15cc30ac2a8d7185f8ebf97dd1ddd90a7c79783b | affected |
| Linux | Linux | 978d8f9055c3a7c35db2ac99cd2580b993396e33 < d0906b0fffc9f19bc42708ca3e84e2089088386c | affected |
| Linux | Linux | 978d8f9055c3a7c35db2ac99cd2580b993396e33 < 6ce71f83f798be7e1ca68707fec449fbecb38852 | affected |
| Linux | Linux | 978d8f9055c3a7c35db2ac99cd2580b993396e33 < b1fd94e704571f98b21027340eecf821b2bdffba | affected |
| Linux | Linux | 4.18 | affected |
| Linux | Linux | 0 < 4.18 | unaffected |
| Linux | Linux | 5.10.127 <= 5.10.* | unaffected |
| Linux | Linux | 5.15.51 <= 5.15.* | unaffected |
| Linux | Linux | 5.18.8 <= 5.18.* | unaffected |
| Linux | Linux | 5.19 <= * | unaffected |
Weaknesses
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
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