CVE-2025-21798: linux NULL Pointer Dereference
CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2025-21798DEBIAN-CVE-2025-21798
Published 27-02-2025Last modified 11-05-2026
Vulnerability summary
CVE-2025-21798 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.22% chance of exploitation in the next 30 days, higher than 11.4% of scored vulnerabilities.
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)EPSS score
0.22%
0%100%
Low · +0.01 pp in 30 daysKEVNot listedIn no KEV catalog
RansomwareNone recordedNo known use recorded
Public exploits0No public exploits recorded
Advisory lineage
Upstream 0 · Downstream 11 · Related 12Timeline
- 27-02-2025PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: firewire: test: Fix potential null dereference in firewire kunit test kunit_kzalloc() may return a NULL pointer, dereferencing it without NULL check may lead to NULL dereference. Add a NULL check for test_state.
CVSS metrics
4 scores · 4 sources · 1 versionMedium 5.5Preferred score · CVE.org (CNA)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HSourcesAll 4 agree
- 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
- NVDNIST5.5MediumCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
EPSS trend
Probability
0.22%
Chance of exploitation in the next 30 days
Percentile
11%
Versus all other CVEs
30-day change
+0.01 pp
From 0.21% on 19-09-2026
19-09-202619-10-2026
EPSS score0.22%
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeAffected systems
Ubuntu106 products
- linux< 6.8.0-64.67
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 6.8.0-1032.34
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 1c8506d62624fbc57db75414a387f365da8422e9, < c6896bf4c611c3dd126f3e03685f2360a18b3d6f | ≥ 1c8506d62624fbc57db75414a387f365da8422e9, < 70fcb25472d90dd3b87cbee74b9eb68670b0c7b8 | ≥ 1c8506d62624fbc57db75414a387f365da8422e9, < 352fafe97784e81a10a7c74bd508f71a19b53c2a | 6.8
- linux_kernel≥ 6.8, < 6.12.13 | ≥ 6.13, < 6.13.2
Debian1 product
- linux< 6.12.13-1
3 vendors · 109 products
