High 7.8Published Oct 4, 2025

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

Updated under an hour ago (Oct 28, 2026, 6:10 AM ET)

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Exploited in the last 30 days

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 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Aug 5, 2026
First seen by InfoSec Signals: Oct 19, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 04e5b1fb01834a602acaae2276b67a783a8c6159 before 14c231959a16ca41bfdcaede72483362a8c645d7; from 04e5b1fb01834a602acaae2276b67a783a8c6159 before 5e94e44c9cb30d7a383d8ac227f24a8c9326b770; from 04e5b1fb01834a602acaae2276b67a783a8c6159 before aaf900a83508c8cd5cdf765e7749f9076196ec7f; from 04e5b1fb01834a602acaae2276b67a783a8c6159 before 4f364023ddcfe83f7073b973a9cb98584b7f2a46; 04e5b1fb01834a602acaae2276b67a783a8c6159 builds before 00e98b5a69034b251bb36dc6e7123d7648e218e4; from 04e5b1fb01834a602acaae2276b67a783a8c6159 before c2ff91255e0157b356cff115d8dc3eeb5162edf2; from 04e5b1fb01834a602acaae2276b67a783a8c6159 before 7ebf70cf181651fe3f2e44e95e7e5073d594c9c0	CNA record
linux linux_kernel linux:linux_kernel	from 5.5 before 5.10.245; from 5.11 before 5.15.194; from 5.16 before 6.1.154; from 6.2 before 6.6.108; from 6.7 before 6.12.49; from 6.13 before 6.16.9; 6.17; 6.17; and 4 more ranges	NVD

References

References

https://git.kernel.org/stable/c/14c231959a16ca41bfdcaede72483362a8c645d7	patch
https://git.kernel.org/stable/c/5e94e44c9cb30d7a383d8ac227f24a8c9326b770	patch
https://git.kernel.org/stable/c/aaf900a83508c8cd5cdf765e7749f9076196ec7f	patch
https://git.kernel.org/stable/c/4f364023ddcfe83f7073b973a9cb98584b7f2a46	patch
https://git.kernel.org/stable/c/00e98b5a69034b251bb36dc6e7123d7648e218e4	patch
https://git.kernel.org/stable/c/c2ff91255e0157b356cff115d8dc3eeb5162edf2	patch
https://git.kernel.org/stable/c/7ebf70cf181651fe3f2e44e95e7e5073d594c9c0	patch

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.