VulnerabilityPublished 24 Apr 2026Updated 10 Nov 2026

CVE-2026-31651: Linux kernel · mmc: vub300: fix NULL-deref on disconnect

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in dff34ef879c5e73298443956a8b391311ba78d57 : update Linux kernel when convenient.

Data as of 10 Nov 2026, 13:05 UTC

Severity

Medium

Rated Medium by Threat Radar's AI analysis · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Patch: Available – fixed in dff34ef879c5e73298443956a8b391311ba78d57, c83a282615d8f7ba28cebddd54600b419d562d82, ba3b9429de94958dc0060d9816a915dd75c34919 +5

Exploitation evidence

Disclosed: evidence found.
CVE published 24 Apr 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 10 Nov 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), 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 to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 88095e7b473a3d9ec3b9c60429576e9cbd327c89, < dff34ef879c5e73298443956a8b391311ba78d57	Fixed in dff34ef879c5e73298443956a8b391311ba78d57
LinuxLinux	Affected ≥ 88095e7b473a3d9ec3b9c60429576e9cbd327c89, < c83a282615d8f7ba28cebddd54600b419d562d82	Fixed in c83a282615d8f7ba28cebddd54600b419d562d82
LinuxLinux	Affected ≥ 88095e7b473a3d9ec3b9c60429576e9cbd327c89, < ba3b9429de94958dc0060d9816a915dd75c34919	Fixed in ba3b9429de94958dc0060d9816a915dd75c34919
LinuxLinux	Affected ≥ 88095e7b473a3d9ec3b9c60429576e9cbd327c89, < 6446516e626ce7c44bdadbcbb3d7677a2c52ce93	Fixed in 6446516e626ce7c44bdadbcbb3d7677a2c52ce93
LinuxLinux	Affected ≥ 88095e7b473a3d9ec3b9c60429576e9cbd327c89, < 6468cab1173f44f7a4b7a05ce8abfdfd1ce1557a	Fixed in 6468cab1173f44f7a4b7a05ce8abfdfd1ce1557a
LinuxLinux	Affected ≥ 88095e7b473a3d9ec3b9c60429576e9cbd327c89, < 517b58e1d067115f80d198feee10192da4c424d0	Fixed in 517b58e1d067115f80d198feee10192da4c424d0

AI-suggested

A fix is available and has been applied in the Linux kernel commits identified by the fixedVersions hashes. Users should update their Linux kernel to a version including these fixes to remediate the vulnerability.

Description

A NULL-pointer dereference vulnerability in the Linux kernel's mmc vub300 driver was fixed by ensuring proper deregistration of the controller before dropping the driver data reference on disconnect. This prevents potential NULL-pointer dereferences or use-after-free conditions.

Impact

If unpatched, this vulnerability could cause kernel crashes or instability due to NULL-pointer dereferences or use-after-free conditions during device disconnect operations. There is no indication of known exploitation in the wild or direct privilege escalation from this flaw.

Summary

CVE-2026-31651 addresses a vulnerability in the Linux kernel's mmc vub300 driver where failing to deregister the controller before releasing the driver data on disconnect could lead to NULL-pointer dereferences or use-after-free errors. The fix involves changing the disconnect sequence to properly deregister the controller first, thereby avoiding these unsafe memory accesses.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 10 Nov 2026, 13:05 UTC

Technical details

References

Community reviews

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