CVE-2022-49698

netfilter: use get_random_u32 instead of prandom

Description

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.

N/A

CVSS

Severity:

EPSS 0.03%

Affected: Linux Linux

References

Link	Tags
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

Frequently Asked Questions

What is the severity of CVE-2022-49698?: CVE-2022-49698 has not yet been assigned a CVSS score.
How to fix CVE-2022-49698?: To fix CVE-2022-49698, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2022-49698 being actively exploited in the wild?: As for now, there are no information to confirm that CVE-2022-49698 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2022-49698?: CVE-2022-49698 affects Linux Linux, Linux Linux.

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