Riskcovery

CVE-2022-49698

netfilter: use get_random_u32 instead of prandom

State
Published
Severity
Not scored
Published
Feb 26, 2025
Updated
May 11, 2026
Reserved
Feb 26, 2025

Read the record on cve.org

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.

Scores

The record has no CVSS score.

Weaknesses

The record names no weakness.

Affected Products

ProductVersions
LinuxLinux
  • 978d8f9055c3a7c35db2ac99cd2580b993396e33 to before 15cc30ac2a8d7185f8ebf97dd1ddd90a7c79783bAffected
  • 978d8f9055c3a7c35db2ac99cd2580b993396e33 to before d0906b0fffc9f19bc42708ca3e84e2089088386cAffected
  • 978d8f9055c3a7c35db2ac99cd2580b993396e33 to before 6ce71f83f798be7e1ca68707fec449fbecb38852Affected
  • 978d8f9055c3a7c35db2ac99cd2580b993396e33 to before b1fd94e704571f98b21027340eecf821b2bdffbaAffected
LinuxLinux
  • 4.18Affected
  • before 4.18Not affected
  • 5.10.127 through 5.10.*Not affected
  • 5.15.51 through 5.15.*Not affected
  • 5.18.8 through 5.18.*Not affected
  • 5.19 and laterNot affected

References

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