vulnerability
Ubuntu: (CVE-2022-49698): linux vulnerability
| Severity | CVSS | Published | Added | Modified |
|---|---|---|---|---|
| 7 | (AV:L/AC:L/Au:S/C:C/I:C/A:C) | 2025-02-26 | 2025-03-19 | 2025-03-21 |
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.
Solution(s)
References
- CVE-2022-49698
- https://attackerkb.com/topics/CVE-2022-49698
- URL-https://git.kernel.org/linus/b1fd94e704571f98b21027340eecf821b2bdffba
- URL-https://git.kernel.org/stable/c/15cc30ac2a8d7185f8ebf97dd1ddd90a7c79783b
- URL-https://git.kernel.org/stable/c/6ce71f83f798be7e1ca68707fec449fbecb38852
- URL-https://git.kernel.org/stable/c/b1fd94e704571f98b21027340eecf821b2bdffba
- URL-https://git.kernel.org/stable/c/d0906b0fffc9f19bc42708ca3e84e2089088386c
- URL-https://www.cve.org/CVERecord?id=CVE-2022-49698
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