High 7.8Published Apr 24, 2026

CVE-2026-31650mmc: vub300: fix use-after-free on disconnect

Updated under an hour ago (Oct 28, 2026, 2:23 AM ET)

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: mmc: vub300: fix use-after-free on disconnect The vub300 driver maintains an explicit reference count for the controller and its driver data and the last reference can in theory be dropped after the driver has been unbound. This specifically means that the controller allocation must not be device managed as that can lead to use-after-free. Note that the lifetime is currently also incorrectly tied the parent USB device rather than interface, which can lead to memory leaks if the driver is unbound without its device being physically disconnected (e.g. on probe deferral). Fix both issues by reverting to non-managed allocation of the controller.

CVSS: 7.8 HIGH (v3.1, NVD)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: Oct 21, 2026
First seen by InfoSec Signals: Oct 9, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	117a9c589ce0cf68065c007a02fd94da01e1181a builds before 4b5251eebc2b1dedbb33fedf1b1109fea161b846; from dcfdd698dc521c6046e9b80c16281575efb25d23 before ea7468f61be033f4e18b95f2912010ed1d175d75; from dcfdd698dc521c6046e9b80c16281575efb25d23 before ef0448c569b37ceabdd038e9faa311e5179127b0; from dcfdd698dc521c6046e9b80c16281575efb25d23 before 8f4d20a710225ec7a565f6a0459862d3b1f32330	CNA record
linux linux_kernel linux:linux_kernel	from 6.17.1 before 6.18.23; from 6.19 before 6.19.13; 6.17; 7.0; 7.0; 7.0; 7.0; 7.0; and 2 more ranges	NVD

References

References

https://git.kernel.org/stable/c/4b5251eebc2b1dedbb33fedf1b1109fea161b846
https://git.kernel.org/stable/c/ea7468f61be033f4e18b95f2912010ed1d175d75	patch
https://git.kernel.org/stable/c/ef0448c569b37ceabdd038e9faa311e5179127b0	patch
https://git.kernel.org/stable/c/8f4d20a710225ec7a565f6a0459862d3b1f32330	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.