CVE-2021-47252: batman-adv: Avoid WARN_ON timing related checks
Vulnerability summary
CVE-2021-47252 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 13.3% of scored vulnerabilities.
Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources
Source freshness unavailable
How is this decided?Advisory lineage
Upstream 0 · Downstream 7 · Related 7Timeline
- 21-05-2024PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: batman-adv: Avoid WARN_ON timing related checks The soft/batadv interface for a queued OGM can be changed during the time the OGM was queued for transmission and when the OGM is actually transmitted by the worker. But WARN_ON must be used to denote kernel bugs and not to print simple warnings. A warning can simply be printed using pr_warn.
CVSS metrics
4 scores · 3 sources · 2 versions- OSV · UbuntuEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
- OSV · DebianEcosystem advisory · calculated5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.23%
Chance of exploitation in the next 30 days
Percentile
13%
Versus all other CVEs
30-day change
No change 0.00 pp
From 0.23% on 04-10-2026
Known exploited
Compare KEV catalogs
CISA KEVNot in the CISA KEV catalog.
ENISA CNWNot in the ENISA CNW catalog.
CIRCLNot in the CIRCL catalog.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.
Ubuntu86 products
- linuxAll versions (No fix recorded) | < 4.15.0-156.163 | < 5.4.0-81.91
- linux-allwinner-5.19All versions (No fix recorded)
- linux-awsAll versions (No fix recorded) | < 4.15.0-1111.118 | < 5.4.0-1055.58
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ ef0a937f7a1450d3a133ccd83c9c7d07587e7a00, < 45011f2973f6b52cf50db397bb27bf805f5f0e7f | ≥ ef0a937f7a1450d3a133ccd83c9c7d07587e7a00, < 6031daaaf6d5c359c99dfffa102e332df234ff09 | ≥ ef0a937f7a1450d3a133ccd83c9c7d07587e7a00, < 77a99aad5bc3ea105806ebae6be3cbadc2fc615e | ≥ ef0a937f7a1450d3a133ccd83c9c7d07587e7a00, < e8e9d2968a9d08bf5c683afca182f1537edebf8d | ≥ ef0a937f7a1450d3a133ccd83c9c7d07587e7a00, < e7fbd8184fa9e85f0d648c499841cb7ff6dec9f4 | ≥ ef0a937f7a1450d3a133ccd83c9c7d07587e7a00, < 282baa8104af44e04c4af3e7f933b44267c7f86f | ≥ ef0a937f7a1450d3a133ccd83c9c7d07587e7a00, < 2eb4e0b3631832a4291c8bf4c9db873f60b128c8 | ≥ ef0a937f7a1450d3a133ccd83c9c7d07587e7a00, < 9f460ae31c4435fd022c443a6029352217a16ac1 | 3.14
- linux_kernel≥ 3.14, < 4.4.293 | ≥ 4.5, < 4.9.274 | ≥ 4.10, < 4.14.238 | ≥ 4.15, < 4.19.196 | ≥ 4.20, < 5.4.128 | ≥ 5.5, < 5.10.46 | ≥ 5.11, < 5.12.13 | 5.13:rc1 | 5.13:rc2 | 5.13:rc3 | 5.13:rc4 | 5.13:rc5 | 5.13:rc6
Debian1 product
- linux< 5.10.46-1
3 vendors · 89 products
