VulnerabilityPublished 24 Apr 2026Updated 21 Oct 2026

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

Affects Linux kernelSource CVE Database V5

Not known to be exploited · fixed in ef0448c569b37ceabdd038e9faa311e5179127b0 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.1% chance of exploitation in 30 days – higher than 4% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in ef0448c569b37ceabdd038e9faa311e5179127b0, ea7468f61be033f4e18b95f2912010ed1d175d75, 8f4d20a710225ec7a565f6a0459862d3b1f32330 +1

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade Linux kernel to ef0448c569b37ceabdd038e9faa311e5179127b0, ea7468f61be033f4e18b95f2912010ed1d175d75, 8f4d20a710225ec7a565f6a0459862d3b1f32330 or 4b5251eebc2b1dedbb33fedf1b1109fea161b846.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ dcfdd698dc521c6046e9b80c16281575efb25d23, < ef0448c569b37ceabdd038e9faa311e5179127b0	Fixed in ef0448c569b37ceabdd038e9faa311e5179127b0
LinuxLinux	Affected ≥ dcfdd698dc521c6046e9b80c16281575efb25d23, < ea7468f61be033f4e18b95f2912010ed1d175d75	Fixed in ea7468f61be033f4e18b95f2912010ed1d175d75
LinuxLinux	Affected ≥ dcfdd698dc521c6046e9b80c16281575efb25d23, < 8f4d20a710225ec7a565f6a0459862d3b1f32330	Fixed in 8f4d20a710225ec7a565f6a0459862d3b1f32330
LinuxLinux	Affected ≥ 117a9c589ce0cf68065c007a02fd94da01e1181a, < 4b5251eebc2b1dedbb33fedf1b1109fea161b846	Fixed in 4b5251eebc2b1dedbb33fedf1b1109fea161b846
LinuxLinux	Affected =6.17	Fixed in–

Description

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.

References

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