7.8

CVE-2025-39951: linux Use After Free

CVSS: 7.8v3.1HighModified
AliasesUBUNTU-CVE-2025-39951DEBIAN-CVE-2025-39951
Published 04-10-2025Last modified 05-08-2026
Open JSON

Vulnerability summary

CVE-2025-39951 is a high (CVSS 7.8) Use After Free vulnerability in linux. EPSS estimates a 0.15% chance of exploitation in the next 30 days, higher than 3.7% of scored vulnerabilities.

Overall risk
31/100
0100
Medium · default modelHow is this calculated?
CVSS score
7.8/10
010
High · v3.1 (CVE.org)
EPSS score
0.15%
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 29 · Related 24
DLA-4379-1DLA-4404-1DSA-6053-1MGASA-2025-0309MGASA-2025-0310USN-8033-1

Timeline

  1. 04-10-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: um: virtio_uml: Fix use-after-free after put_device in probe When register_virtio_device() fails in virtio_uml_probe(), the code sets vu_dev->registered = 1 even though the device was not successfully registered. This can lead to use-after-free or other issues.

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.15%

Chance of exploitation in the next 30 days

Percentile

4%

Versus all other CVEs

30-day change

0.00 pp

From 0.15% on 19-09-2026

19-09-202619-10-2026
EPSS score
0.15%

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

Ubuntu136 products
  • linux< 5.15.0-170.180 | < 6.8.0-106.106
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.15.0-1100.107 | < 6.8.0-1050.53
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 04e5b1fb01834a602acaae2276b67a783a8c6159, < 14c231959a16ca41bfdcaede72483362a8c645d7 | ≥ 04e5b1fb01834a602acaae2276b67a783a8c6159, < 5e94e44c9cb30d7a383d8ac227f24a8c9326b770 | ≥ 04e5b1fb01834a602acaae2276b67a783a8c6159, < aaf900a83508c8cd5cdf765e7749f9076196ec7f | ≥ 04e5b1fb01834a602acaae2276b67a783a8c6159, < 4f364023ddcfe83f7073b973a9cb98584b7f2a46 | ≥ 04e5b1fb01834a602acaae2276b67a783a8c6159, < 00e98b5a69034b251bb36dc6e7123d7648e218e4 | ≥ 04e5b1fb01834a602acaae2276b67a783a8c6159, < c2ff91255e0157b356cff115d8dc3eeb5162edf2 | ≥ 04e5b1fb01834a602acaae2276b67a783a8c6159, < 7ebf70cf181651fe3f2e44e95e7e5073d594c9c0 | 5.5
  • linux_kernel≥ 5.5, < 5.10.245 | ≥ 5.11, < 5.15.194 | ≥ 5.16, < 6.1.154 | ≥ 6.2, < 6.6.108 | ≥ 6.7, < 6.12.49 | ≥ 6.13, < 6.16.9 | 6.17:rc1 | 6.17:rc2 | 6.17:rc3 | 6.17:rc4 | 6.17:rc5 | 6.17:rc6
Debian1 product
  • linux< 6.1.158-1 | < 6.12.57-1 | < 6.16.9-1

3 vendors · 139 products

References

35 links
Show all 35 references