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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 0/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.22% (FIRST EPSS).
  • Fixed version: Linux Linux 2e6b9a394206c76dd417c991312f349435ef35e6, 7ee7a77ec2f446109ab52cc80ace7acc22ab6211, 8344611477c9241f45f20981990780fc5f0996f8.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 2e6b9a394206c76dd417c991312f349435ef35e6, 7ee7a77ec2f446109ab52cc80ace7acc22ab6211, 8344611477c9241f45f20981990780fc5f0996f8 or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

—No exploit Fix available
Published
Aug 28, 2026
Updated
Nov 6, 2026
EPSS
0.2% · 12th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.2%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

Get told when this record changes

  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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Noroxi analysis

What does it mean in your environment?

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.0affected
    • 88095e7b473a3d9ec3b9c60429576e9cbd327c89 and later · before 8672b8bdbd2063b3fcbd75f729e4706fcdad2257affected · git
    • 88095e7b473a3d9ec3b9c60429576e9cbd327c89 and later · before 8344611477c9241f45f20981990780fc5f0996f8affected · git
    • 88095e7b473a3d9ec3b9c60429576e9cbd327c89 and later · before 2e6b9a394206c76dd417c991312f349435ef35e6affected · git
    • 88095e7b473a3d9ec3b9c60429576e9cbd327c89 and later · before 7ee7a77ec2f446109ab52cc80ace7acc22ab6211affected · git
    • 88095e7b473a3d9ec3b9c60429576e9cbd327c89 and later · before 9f5e04235a0b59e6e30af9f45511addf2604d757affected · git
    • 88095e7b473a3d9ec3b9c60429576e9cbd327c89 and later · before bf9848a22a8e50d39d5e8d871581f0a8110f16b3affected · git
    • 88095e7b473a3d9ec3b9c60429576e9cbd327c89 and later · before c2e1d33929565fa14c48d8a5a45edc3ebfc941b2affected · git
    • 88095e7b473a3d9ec3b9c60429576e9cbd327c89 and later · before ee5fb641c4ccac8406c668d3e947eb20ce44f233affected · git
    • before 3.0not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

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    40Plan
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  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
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Published before and after this one in the same product

  • ← EarlierCVE-2026-80654Aug 28, 2026 · soc: xilinx: Shutdown and free rx mailbox channel
    0Monitor
  • ← EarlierCVE-2026-80655Aug 28, 2026 · soc: xilinx: Fix race condition in event registration
    0Monitor
  • Later →CVE-2026-80662Aug 28, 2026 · cxl: Fix CXL_HEADERLOG_SIZE to match RAS Capability size
    28Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux2e6b9a394206c76dd417c991312f349435ef35e6Vendor (CNA)
Linux Linux7ee7a77ec2f446109ab52cc80ace7acc22ab6211Vendor (CNA)
Linux Linux8344611477c9241f45f20981990780fc5f0996f8Vendor (CNA)
Linux Linux8672b8bdbd2063b3fcbd75f729e4706fcdad2257Vendor (CNA)
Linux Linux9f5e04235a0b59e6e30af9f45511addf2604d757Vendor (CNA)
Linux Linuxbf9848a22a8e50d39d5e8d871581f0a8110f16b3Vendor (CNA)
Linux Linuxc2e1d33929565fa14c48d8a5a45edc3ebfc941b2Vendor (CNA)
Linux Linuxee5fb641c4ccac8406c668d3e947eb20ce44f233Vendor (CNA)
debian:linux6.1.180-1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

All national notices →

Technical details

No CVSS vector for this record, so attack conditions can't be derived.

Weakness class (CWE)

—

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records