CVE-2022-49698

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.

CVSS Metrics

• v3.1•HIGH•Score: 7.8CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

EPSS Trends

Current EPSS score: 0.11%• Percentile: 30%

Affected Systems

• linux•linux

  ≥ 978d8f9055c3a7c35db2ac99cd2580b993396e33, < 15cc30ac2a8d7185f8ebf97dd1ddd90a7c79783b | ≥ 978d8f9055c3a7c35db2ac99cd2580b993396e33, < d0906b0fffc9f19bc42708ca3e84e2089088386c | ≥ 978d8f9055c3a7c35db2ac99cd2580b993396e33, < 6ce71f83f798be7e1ca68707fec449fbecb38852 | ≥ 978d8f9055c3a7c35db2ac99cd2580b993396e33, < b1fd94e704571f98b21027340eecf821b2bdffba | 4.18

• linux•linux_kernel

  ≥ 4.18, < 5.10.127 | ≥ 5.11, < 5.15.51 | ≥ 5.16, < 5.18.8 | 5.19:rc1 | 5.19:rc2 | 5.19:rc3

References (4)

• 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