5.5

CVE-2025-21978: linux

CVSS: 5.5v3.1MediumModified
AliasesUBUNTU-CVE-2025-21978DEBIAN-CVE-2025-21978
Published 01-04-2025Last modified 11-05-2026
Open JSON

Vulnerability summary

CVE-2025-21978 is a medium (CVSS 5.5) vulnerability in linux. EPSS estimates a 0.19% chance of exploitation in the next 30 days, higher than 8.1% 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
0.19%
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 32 · Related 28
DLA-4193-1DSA-5900-1MGASA-2025-0142MGASA-2025-0146SUSE-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: drm/hyperv: Fix address space leak when Hyper-V DRM device is removed When a Hyper-V DRM device is probed, the driver allocates MMIO space for the vram, and maps it cacheable. If the device removed, or in the error path for device probing, the MMIO space is released but no unmap is done. Consequently the kernel address space for the mapping is leaked. Fix this by adding iounmap() calls in the device removal path, and in the error path during device probing.

CVSS metrics

3 scores · 3 sources · 1 version

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

19-09-202619-10-2026
EPSS score
0.19%

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

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≥ a0ab5abced550ddeefddb06055ed60779a54eb79, < c40cd24bfb9bfbb315c118ca14ebe6cf52e2dd1e | ≥ a0ab5abced550ddeefddb06055ed60779a54eb79, < ad27b4a51495490b815580d9b935e8eee14d1a9c | ≥ a0ab5abced550ddeefddb06055ed60779a54eb79, < 24f1bbfb2be77dad82489c1468bbb14312aab129 | ≥ a0ab5abced550ddeefddb06055ed60779a54eb79, < 158242b56bf465a73e1edeac0fe828a8acad4499 | ≥ a0ab5abced550ddeefddb06055ed60779a54eb79, < aed709355fd05ef747e1af24a1d5d78cd7feb81e | 6.0
  • linux_kernel≥ 6.0, < 6.1.132 | ≥ 6.2, < 6.6.84 | ≥ 6.7, < 6.12.20 | ≥ 6.13, < 6.13.8 | 6.14:rc1 | 6.14:rc2 | 6.14:rc3 | 6.14:rc4 | 6.14:rc5 | 6.14:rc6
Debian1 product
  • linux< 6.1.133-1 | < 6.12.20-1

3 vendors · 113 products

References

28 links
Show all 28 references