UBUNTU-CVE-2022-49698
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.
02 / AFFECTED SOFTWARE
Affected packages
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03 / CONNECTIONS
Connected vulnerabilities
04 / EVIDENCE
Source records
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.
05 / REFERENCES
Further evidence
- https://git.kernel.org/linus/b1fd94e704571f98b21027340eecf821b2bdffba
- https://git.kernel.org/stable/c/15cc30ac2a8d7185f8ebf97dd1ddd90a7c79783b
- https://git.kernel.org/stable/c/6ce71f83f798be7e1ca68707fec449fbecb38852
- https://git.kernel.org/stable/c/b1fd94e704571f98b21027340eecf821b2bdffba
- https://git.kernel.org/stable/c/d0906b0fffc9f19bc42708ca3e84e2089088386c
- https://ubuntu.com/security/CVE-2022-49698
- https://ubuntu.com/security/notices/USN-7990-1
- https://ubuntu.com/security/notices/USN-7990-2
- https://ubuntu.com/security/notices/USN-7990-3
- https://ubuntu.com/security/notices/USN-7990-4
- https://ubuntu.com/security/notices/USN-7990-5
- https://ubuntu.com/security/notices/USN-7990-6
- https://ubuntu.com/security/notices/USN-8224-1
- https://www.cve.org/CVERecord?id=CVE-2022-49698