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Review reviewHigh

CVE-2025-39951

Linux Linux, linux kernel

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
7.8
EPSS
-
- percentile
CISA KEV
Not listed
Published
2025.10.04
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 7.8

Vulnerability overview

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.

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= 04e5b1fb01834a602acaae2276b67a783a8c6159 < 14c231959a16ca41bfdcaede72483362a8c645d7, >= 04e5b1fb01834a602acaae2276b67a783a8c6159 < 5e94e44c9cb30d7a383d8ac227f24a8c9326b770, >= 04e5b1fb01834a602acaae2276b67a783a8c6159 < aaf900a83508c8cd5cdf765e7749f9076196ec7f, >= 04e5b1fb01834a602acaae2276b67a783a8c6159 < 4f364023ddcfe83f7073b973a9cb98584b7f2a46, >= 04e5b1fb01834a602acaae2276b67a783a8c6159 < 00e98b5a69034b251bb36dc6e7123d7648e218e4, >= 04e5b1fb01834a602acaae2276b67a783a8c6159 < c2ff91255e0157b356cff115d8dc3eeb5162edf2, >= 04e5b1fb01834a602acaae2276b67a783a8c6159 < 7ebf70cf181651fe3f2e44e95e7e5073d594c9c0, >= 5.5, >= 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
Fixed versions
5.10.245, 5.15.194, 6.1.154, 6.6.108, 6.12.49, 6.16.9

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-416