5.5

CVE-2025-21909: linux Race Condition

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2025-21909DEBIAN-CVE-2025-21909
Published 01-04-2025Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2025-21909 is a medium (CVSS 5.5) Race Condition vulnerability in linux. EPSS estimates a 0.17% chance of exploitation in the next 30 days, higher than 5.5% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (NVD)
EPSS score
0.17%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 62 · Related 59
DLA-4178-1DLA-4193-1DSA-5900-1SUSE-SU-2025:01600-1SUSE-SU-2025:01614-1SUSE-SU-2025:01707-1

Timeline

  1. 01-04-2025
    PublishedVulnerability first disclosed.
  2. 11-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: nl80211: reject cooked mode if it is set along with other flags It is possible to set both MONITOR_FLAG_COOK_FRAMES and MONITOR_FLAG_ACTIVE flags simultaneously on the same monitor interface from the userspace. This causes a sub-interface to be created with no IEEE80211_SDATA_IN_DRIVER bit set because the monitor interface is in the cooked state and it takes precedence over all other states. When the interface is then being deleted the kernel calls WARN_ONCE() from check_sdata_in_driver() because of missing that bit. Fix this by rejecting MONITOR_FLAG_COOK_FRAMES if it is set along with other flags. Found by Linux Verification Center (linuxtesting.org) with Syzkaller.

CVSS metrics

3 scores · 3 sources · 1 version

EPSS trend

Probability

0.17%

Chance of exploitation in the next 30 days

Percentile

6%

Versus all other CVEs

30-day change

0.00 pp

From 0.17% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.17%

Known exploited

Compare KEV catalogs

Not in any of the 3 tracked catalogs.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

Affected systems

Ubuntu137 products
  • linuxAll versions (No fix recorded) | < 5.4.0-216.236 | < 5.15.0-140.150 | < 6.8.0-84.84
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1146.156 | < 5.15.0-1084.91 | < 6.8.0-1039.41
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a, < 5ea856d93794c4afa5542defd8c61f2708dc245a | ≥ 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a, < 351eb7ac53ff1cd94d893c0c4534ced2f36ae7d7 | ≥ 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a, < cd1bdcb77fdc03c253137e55bae10551b3481461 | ≥ 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a, < 236f41ca728f23210b31ed2d1d8a6df575a4b2d6 | ≥ 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a, < ebebbb0eded2ed9a1abfa31962f6fb699e6abce7 | ≥ 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a, < 521e55c2b0d6028861ac0a2d06aa57bb0e3ac486 | ≥ 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a, < ac4860141300581d3e2f6c6dafa37220f7ea9f65 | ≥ 66f7ac50ed7cc5c19a62bc97e8f6e7891004a03a, < 49f27f29446a5bfe633dd2cc0cfebd48a1a5e77f | 2.6.26
  • linux_kernel≥ 2.6.26, < 5.4.291 | ≥ 5.5, < 5.10.235 | ≥ 5.11, < 5.15.179 | ≥ 5.16, < 6.1.131 | ≥ 6.2, < 6.6.83 | ≥ 6.7, < 6.12.19 | ≥ 6.13, < 6.13.7 | 6.14:rc1 | 6.14:rc2 | 6.14:rc3 | 6.14:rc4 | 6.14:rc5
Debian1 product
  • linux< 6.1.133-1 | < 6.12.19-1

3 vendors · 140 products

References

62 links
Show all 62 references