CVE-2022-49698

netfilter: use get_random_u32 instead of prandom

HIGH

7.8

CVSS Score

Published: February 26, 2025 at 02:24 AM UTC

Updated: June 17, 2026 at 05:18 AM UTC

1 product affected across 1 vendorLinux Kernel

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Severity

HIGH7.8

Exploit prediction

EPSS 0.3%

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.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel · Linux

95%

4.18 ≤ v < 5.10.1274.18 ≤ v < 5.15.514.18 ≤ v < 5.18.84.18 ≤ v < 5.195.11 ≤ v < 5.15.515.16 ≤ v < 5.18.84.18 5.19 rc1 5.19 rc2 5.19 rc3978d8f9055c3a7c35db2ac99cd2580b993396e33

Vendor states this is fixed in 15cc30ac2a8d7185f8ebf97dd1ddd90a7c79783b (fixed)

Vendor states this is fixed in 6ce71f83f798be7e1ca68707fec449fbecb38852 (fixed)

Vendor states this is fixed in b1fd94e704571f98b21027340eecf821b2bdffba (fixed)

Vendor states this is fixed in d0906b0fffc9f19bc42708ca3e84e2089088386c (fixed)

Vendor states this is fixed in 4.18 (unaffected)

Vendor states this is fixed in 5.10.127 (unaffected)

Vendor states this is fixed in 5.15.51 (unaffected)

Vendor states this is fixed in 5.18.8 (unaffected)

Vendor states this is fixed in 5.19 (unaffected)