5.5

CVE-2025-21904: linux NULL Pointer Dereference

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2025-21904DEBIAN-CVE-2025-21904
Published 01-04-2025Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2025-21904 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.23% chance of exploitation in the next 30 days, higher than 12.3% of scored vulnerabilities.

Overall risk
22/100
0100
Low · default modelHow is this calculated?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.23%
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 61 · Related 58
DLA-4178-1DLA-4193-1DSA-5900-1SUSE-SU-2025:01614-1SUSE-SU-2025:01707-1SUSE-SU-2025:01919-1

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: caif_virtio: fix wrong pointer check in cfv_probe() del_vqs() frees virtqueues, therefore cfv->vq_tx pointer should be checked for NULL before calling it, not cfv->vdev. Also the current implementation is redundant because the pointer cfv->vdev is dereferenced before it is checked for NULL. Fix this by checking cfv->vq_tx for NULL instead of cfv->vdev before calling del_vqs().

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.23%

Chance of exploitation in the next 30 days

Percentile

12%

Versus all other CVEs

30-day change

0.00 pp

From 0.23% on 18-09-2026

18-09-202618-10-2026
EPSS score
0.23%

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≥ 0d2e1a2926b1839a4b74519e660739b2566c9386, < 990fff6980d0c1693d60a812f58dbf93eab0473f | ≥ 0d2e1a2926b1839a4b74519e660739b2566c9386, < 7b5fe58959822e6cfa884327cabba6be3b01883d | ≥ 0d2e1a2926b1839a4b74519e660739b2566c9386, < 8e4e08ca4cc634b337bb74bc9a70758fdeda0bcb | ≥ 0d2e1a2926b1839a4b74519e660739b2566c9386, < 29e0cd296c87240278e2f7ea4cf3f496b60c03af | ≥ 0d2e1a2926b1839a4b74519e660739b2566c9386, < 90d302619ee7ce5ed0c69c29c290bdccfde66418 | ≥ 0d2e1a2926b1839a4b74519e660739b2566c9386, < 56cddf71cce3b15b078e937fadab29962b6f6643 | ≥ 0d2e1a2926b1839a4b74519e660739b2566c9386, < 597c27e5f04cb50e56cc9aeda75d3e42b6b89c3e | ≥ 0d2e1a2926b1839a4b74519e660739b2566c9386, < a466fd7e9fafd975949e5945e2f70c33a94b1a70 | 3.10
  • linux_kernel≥ 3.10, < 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

63 links
Show all 63 references