Unknown

CVE-2026-80659 — mmc: vub300: defer reset until cmd_mutex is unlocked

In the Linux kernel, the following vulnerability has been resolved: mmc: vub300: defer reset until cmd_mutex is unlocked vub300_cmndwork_thread() holds cmd_mutex while it sends a command and waits for the command response. If the response wait times out, __vub300_command_response() kills the command URBs and then synchronously resets the USB device through usb_reset_device(). That reset path re-enters the driver through vub300_pre_reset(), which also takes cmd_mutex. The worker therefore tries to acquire the same mutex recursively while it is still holding it from the command path. This issue was found by our static analysis tool and then manually reviewed against the current tree. The grounded PoC kept the real worker and timeout/reset carrier: vub300_cmndwork_thread() __vub300_command_response() usb_lock_device_for_reset() usb_reset_device() vub300_pre_reset() Lockdep reported the same-task recursive acquisition on cmd_mutex: WARNING: possible recursive locking detected ... (&test_vub300.cmd_mutex) ... at: usb_reset_device... [vuln_msv] ... (&test_vub300.cmd_mutex) ... at: vub300_cmndwork_thread+0x12/0x20 [vuln_msv] Workqueue: vub300_cmd_wq vub300_cmndwork_thread [vuln_msv] *** DEADLOCK *** Return a flag from __vub300_command_response() when the timeout path needs a device reset, then perform the reset after vub300_cmndwork_thread() has cleared the in-flight command state and dropped cmd_mutex. The reset is still attempted before mmc_request_done(), preserving the existing request completion ordering while avoiding the recursive lock.

Published Aug 28, 2026 · Updated Oct 15, 2026 · Sources: NIST National Vulnerability Database, CVE Program (cve.org) e CISA ADP · CNA: Linux

Low

Who exploits it and how urgent it is

A 0–100 score combining confirmed exploitation, ransomware and APT use, public exploits, EPSS and severity.

No exploitation signal in the sources consulted so far.

How the score was calculated

EPSS 0.2% (30-day exploitation probability)+2

The score orders the patch queue; it does not replace your asset context (internet exposure, criticality, compensating controls).

Triage

Is it exploited, how likely is exploitation, what does it touch, and how severe do the sources call it.

Exploitation

Not confirmed

Not in CISA KEV — an absence of record, not proof it is unexploited.

EPSS FIRST

0.22%

ahead of 12% of scored CVEs · Oct 27, 2026

Affects

Linux

CVSS base

—

Score not published yet.

Remediation

Fixes and mitigations documented by the sources — linked to the original advisory.

No fix documented by the sources we poll. That does not mean none exists: check the vendor advisory.

First 24 hours

Ordered from the record’s own fields — exposure first, because you cannot patch what you have not found. A rule-generated starting point.

Identify exposed assets running the affected vendor/product/version combinations (Linux Linux).
No fix documented in the sources: reduce exposure and monitor the vendor advisory.
Search available logs for exploit probes, errors and authentication anomalies.

Affected scope

Vendor, product and versions as the sources word them.

Vendor	Product	Versions	Status	Source
Linux	Linux	≥ 88095e7b473a3d9ec3b9c60429576e9cbd327c89 and < 8672b8bdbd2063b3fcbd75f729e4706fcdad2257≥ 88095e7b473a3d9ec3b9c60429576e9cbd327c89 and < 8344611477c9241f45f20981990780fc5f0996f8≥ 88095e7b473a3d9ec3b9c60429576e9cbd327c89 and < 2e6b9a394206c76dd417c991312f349435ef35e6≥ 88095e7b473a3d9ec3b9c60429576e9cbd327c89 and < 7ee7a77ec2f446109ab52cc80ace7acc22ab6211≥ 88095e7b473a3d9ec3b9c60429576e9cbd327c89 and < 9f5e04235a0b59e6e30af9f45511addf2604d757≥ 88095e7b473a3d9ec3b9c60429576e9cbd327c89 and < bf9848a22a8e50d39d5e8d871581f0a8110f16b3≥ 88095e7b473a3d9ec3b9c60429576e9cbd327c89 and < c2e1d33929565fa14c48d8a5a45edc3ebfc941b2≥ 88095e7b473a3d9ec3b9c60429576e9cbd327c89 and < ee5fb641c4ccac8406c668d3e947eb20ce44f233 and 1 more version 3.0	Vulnerable	CVE Program (cve.org) e CISA ADP

EPSS over time FIRST

Oct 15, 2026 → Oct 27, 2026 · 12 reading(s) · max 0.22%

Detection

Read off the CVSS vector and the weakness class. Starting points, not tested rules.

Not enough vector or weakness data: use the affected application’s logs as a starting point.

application logs

Timeline

What happened to this CVE, newest first.

2026
Record published
Oct 15, 2026
Affected products added · linux/linux
Oct 15, 2026 · CVE Program (cve.org) e CISA ADP
Source status changed · → Received
Oct 15, 2026 · NIST National Vulnerability Database
Record created in this database
Oct 15, 2026 · NIST National Vulnerability Database
CVE published
Aug 28, 2026 · Linux

Source activity

Repeated readings are counted rather than listed.

1× Official description updated · Oct 15, 2026 – Oct 15, 2026

References

8 on the record

git.kernel.org/stable/c/2e6b9a394206c76dd417c991312f349435ef35e6
NIST National Vulnerability Database
git.kernel.org/stable/c/c2e1d33929565fa14c48d8a5a45edc3ebfc941b2
NIST National Vulnerability Database
git.kernel.org/stable/c/bf9848a22a8e50d39d5e8d871581f0a8110f16b3
NIST National Vulnerability Database
git.kernel.org/stable/c/7ee7a77ec2f446109ab52cc80ace7acc22ab6211
NIST National Vulnerability Database
git.kernel.org/stable/c/9f5e04235a0b59e6e30af9f45511addf2604d757
NIST National Vulnerability Database
git.kernel.org/stable/c/8672b8bdbd2063b3fcbd75f729e4706fcdad2257
NIST National Vulnerability Database
git.kernel.org/stable/c/8344611477c9241f45f20981990780fc5f0996f8
NIST National Vulnerability Database
git.kernel.org/stable/c/ee5fb641c4ccac8406c668d3e947eb20ce44f233
NIST National Vulnerability Database

Elsewhere on this site

Linux
every CVE for this vendor

Related CVEs (same products)

Unknown CVE-2026-99215 power: supply: core: prevent unregistering a power supply while a callback runs 2h
Unknown CVE-2026-99216 Drivers: hv: Don't reset VMBus connection state on error/exit paths 2h
Unknown CVE-2026-99214 drm/vc4: hdmi: Move packet RAM enable to PM runtime 2h
Unknown CVE-2026-99213 vsock: treat TCP_CLOSING as once-established 2h
Unknown CVE-2026-99212 net/rds: don't let the rdma_cm destroy an id RDS still owns on route failure 2h
Unknown CVE-2026-99211 netlink: reset skb headers before unicast and multicast filtering 2h

Not in any source we poll

Listed rather than left blank: an empty field and an unmeasured one look identical on screen, and only one is a reason to look elsewhere.

No CVSS score published by NVD, the CNA, CISA or GitHub so far.
No fixed version, patch or mitigation documented.
No CISA SSVC assessment.
No CWE classification.
No confirmed IOCs, IP addresses, domains, file hashes, or malware artifacts supplied.
No organization-specific asset inventory, compensating-control status, or patch deployment evidence supplied.
No exploit packet captures, log samples, or incident case IDs supplied.

Answered from this record

Text assembled only from the fields above — no additional claims.

What should defenders know first?

CVE-2026-80659 is "mmc: vub300: defer reset until cmd_mutex is unlocked", rated Unknown. It affects Linux (Linux); versions are in the scope table. It is not in CISA KEV, which does not rule out exploitation. EPSS 0.22% estimates the probability of exploitation in 30 days; neither replaces your asset context. First verify whether exposed or business-critical assets run the affected versions, apply vendor fixes or mitigations, and preserve logs for review.

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