7.8

CVE-2022-49698: netfilter: use get_random_u32 instead of prandom

Analyzed
AliasesUBUNTU-CVE-2022-49698DEBIAN-CVE-2022-49698
Published 26-02-2025Last modified 11-05-2026

Vulnerability summary

CVE-2022-49698 is a high (CVSS 7.8) vulnerability in linux. EPSS estimates a 0.30% chance of exploitation in the next 30 days, higher than 22.3% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 7.8, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
7.8/10
010
High · v3.1 (NVD)
EPSS score
0.30%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 9 · Related 7
RHSA-2022:7683RHSA-2022:8267USN-7990-1USN-7990-2USN-7990-3USN-7990-4

Timeline

  1. 26-02-2025
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

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

4 scores · 3 sources · 2 versions

EPSS trend

Probability

0.30%

Chance of exploitation in the next 30 days

Percentile

22%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.30% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu108 products
  • linux< 5.4.0-225.245 | < 5.15.0-48.54
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.4.0-1154.164 | < 5.15.0-1020.24
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 978d8f9055c3a7c35db2ac99cd2580b993396e33, < 15cc30ac2a8d7185f8ebf97dd1ddd90a7c79783b | ≥ 978d8f9055c3a7c35db2ac99cd2580b993396e33, < d0906b0fffc9f19bc42708ca3e84e2089088386c | ≥ 978d8f9055c3a7c35db2ac99cd2580b993396e33, < 6ce71f83f798be7e1ca68707fec449fbecb38852 | ≥ 978d8f9055c3a7c35db2ac99cd2580b993396e33, < b1fd94e704571f98b21027340eecf821b2bdffba | 4.18
  • 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
Debian1 product
  • linux< 5.18.14-1

3 vendors · 111 products

References

15 links
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