CVE-2025-21995: linux
Vulnerability summary
CVE-2025-21995 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8% of scored vulnerabilities.
Advisory lineage
Upstream 0 · Downstream 30 · Related 28Timeline
- 03-04-2025PublishedVulnerability first disclosed.
- 11-05-2026Last modifiedVulnerability information updated.
Description
In the Linux kernel, the following vulnerability has been resolved: drm/sched: Fix fence reference count leak The last_scheduled fence leaks when an entity is being killed and adding the cleanup callback fails. Decrement the reference count of prev when dma_fence_add_callback() fails, ensuring proper balance. [phasta: add git tag info for stable kernel]
CVSS metrics
4 scores · 4 sources · 1 version- 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
0.19%
Chance of exploitation in the next 30 days
Percentile
8%
Versus all other CVEs
30-day change
0.00 pp
From 0.19% on 19-09-2026
Known exploited
Compare KEV catalogsNot in any of the 3 tracked catalogs.
Public exploits
0 foundNo public exploits indexed.
Weaknesses
CWE · root causeNo weakness data has been published for this record.
Affected systems
Ubuntu110 products
- linux< 6.8.0-84.84
- linux-allwinner-5.19All versions (No fix recorded)
- linux-aws< 6.8.0-1039.41
- linux-aws-5.0All versions (No fix recorded)
- linux-aws-5.11All versions (No fix recorded)
Linux2 products
- linux≥ 2fdb8a8f07c2f1353770a324fd19b8114e4329ac, < c76bd3c99293834de7d1dca5de536616d5655e38 | ≥ 2fdb8a8f07c2f1353770a324fd19b8114e4329ac, < 1135a9431160575466ea9ac37ebd756ecbe35fff | ≥ 2fdb8a8f07c2f1353770a324fd19b8114e4329ac, < 35399c84dcedd6d31448fb9e1336ef52673f2882 | ≥ 2fdb8a8f07c2f1353770a324fd19b8114e4329ac, < a952f1ab696873be124e31ce5ef964d36bce817f | 6.2
- linux_kernel≥ 6.2, < 6.6.85 | ≥ 6.7, < 6.12.21 | ≥ 6.13, < 6.13.9 | 6.14:rc1 | 6.14:rc2 | 6.14:rc3 | 6.14:rc4 | 6.14:rc5 | 6.14:rc6 | 6.14:rc7
Debian1 product
- linux< 6.12.21-1
3 vendors · 113 products
