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  4. CVE 2025 39951 um virtiouml fix use after free after putdevice
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Back to active CVEs
High · CVSS 7.8CVE-2025-39951

um: virtio_uml: Fix use-after-free after put_device in probeCVE-2025-39951

Answer in brief

CVE-2025-39951 records a High severity (CVSS 7.8) vulnerability in um: virtio_uml: Fix use-after-free after put_device in probe. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Oct 4, 2025Updated Oct 19, 2026Source checked Nov 5, 2026First seen by HOL Aug 5, 2026Material review Oct 19, 2026
Upstream Advisory

Record context

Vulnerability class
Memory Corruption
EPSS
Not reported
CWE IDs
CWE-416
Source
CVE List V5
Source checked
Nov 5, 2026
References
7 linked sources
Open source record

Key facts

Risk
High · CVSS 7.8
Exploitation
Not marked as known exploited
Affected software
9 mapped packages or products
Fix availability
Available

Why this deserves its current priority

CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Affected products and reported versions
ProductAffected versionsFixed versions
cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:6.17:rc1:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:6.17:rc2:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:6.17:rc3:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:6.17:rc4:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:6.17:rc5:*:*:*:*:*:*Not reportedNot reported
cpe:2.3:o:linux:linux_kernel:6.17:rc6:*:*:*:*:*:*Not reportedNot reported
Mapped affected packages and fixed versions
PackageAffected rangeFixed version
Linux/Linuxgeneric>=04e5b1fb01834a602acaae2276b67a783a8c6159 <14c231959a16ca41bfdcaede72483362a8c645d7 || >=04e5b1fb01834a602acaae2276b67a783a8c6159 <5e94e44c9cb30d7a383d8ac227f24a8c9326b770 || >=04e5b1fb01834a602acaae2276b67a783a8c6159 <aaf900a83508c8cd5cdf765e7749f9076196ec7f || >=04e5b1fb01834a602acaae2276b67a783a8c6159 <4f364023ddcfe83f7073b973a9cb98584b7f2a46 || >=04e5b1fb01834a602acaae2276b67a783a8c6159 <00e98b5a69034b251bb36dc6e7123d7648e218e4 || >=04e5b1fb01834a602acaae2276b67a783a8c6159 <c2ff91255e0157b356cff115d8dc3eeb5162edf2 || >=04e5b1fb01834a602acaae2276b67a783a8c6159 <7ebf70cf181651fe3f2e44e95e7e5073d594c9c014c231959a16ca41bfdcaede72483362a8c645d7, 5e94e44c9cb30d7a383d8ac227f24a8c9326b770, aaf900a83508c8cd5cdf765e7749f9076196ec7f, 4f364023ddcfe83f7073b973a9cb98584b7f2a46, 00e98b5a69034b251bb36dc6e7123d7648e218e4, c2ff91255e0157b356cff115d8dc3eeb5162edf2, 7ebf70cf181651fe3f2e44e95e7e5073d594c9c0
Linux/Linuxgeneric5.5Not reported

Recommended response

  1. 1Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
  2. 2Review the reported fix. Update Linux/Linux to 14c231959a16ca41bfdcaede72483362a8c645d7 if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

  1. Published upstream

    Oct 4, 2025

    Evidence: source:cvelist:source_dates:source-dates:record

  2. Source modified

    Oct 19, 2026

    Evidence: source:cvelist:source_dates:source-dates:record

  3. First seen by HOL

    Aug 5, 2026

Sources and claim methodology

  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
  • Source referencegit.kernel.org
Upstream source 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.

Quoted source text, attributed separately from HOL analysis.