CVE-2026-80659: Linux kernel · mmc: vub300: defer reset until cmd_mutex is unlocked
Affects Linux kernelSource CVE Database V5
Not known to be exploited · fixed in ee5fb641c4ccac8406c668d3e947eb20ce44f233 : update Linux kernel when convenient.
Data as of 6 Nov 2026, 17:41 UTC
Rated Medium by Threat Radar's AI analysis · CVSS not yet scored by NVD
Thin evidence
One scorer or none- CISA SSVC
- Exploitation
- No evidence of active exploitation and no public proof of concept
- Automatable
- Attackers cannot reliably automate steps 1–4 of the kill chain
- Technical impact
- Limited control over the software or limited information exposure
CISA SSVC assessment, 2026-11-06.
- Patch
- Available – fixed in ee5fb641c4ccac8406c668d3e947eb20ce44f233, c2e1d33929565fa14c48d8a5a45edc3ebfc941b2, bf9848a22a8e50d39d5e8d871581f0a8110f16b3 +5
Exploitation evidence
Disclosed: evidence found.
CVE published 28 Aug 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 6 Nov 2026.
What to do
Upgrade to a fixed release listed under Affected software.
Affected software
| Product | Affected | Fixed in |
|---|---|---|
| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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| LinuxLinux | Affected
| Fixed in
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AI-suggested
A fix is available in the Linux kernel as indicated by multiple fixed commit versions. Users should update to a Linux kernel version that includes these fixes to avoid the deadlock issue. No additional mitigation is required beyond applying the official fix.
Description
A deadlock vulnerability in the Linux kernel's mmc vub300 driver was fixed by deferring USB device reset until after the cmd_mutex is released. The issue involved recursive locking of cmd_mutex during a device reset triggered by a command timeout, causing a deadlock.
References
- git.kernel.org/stable/c/8672b8bdbd2063b3fcbd75f729e4706fcdad2257 (opens in a new tab)
- git.kernel.org/stable/c/8344611477c9241f45f20981990780fc5f0996f8 (opens in a new tab)
- git.kernel.org/stable/c/2e6b9a394206c76dd417c991312f349435ef35e6 (opens in a new tab)
- git.kernel.org/stable/c/7ee7a77ec2f446109ab52cc80ace7acc22ab6211 (opens in a new tab)
- git.kernel.org/stable/c/9f5e04235a0b59e6e30af9f45511addf2604d757 (opens in a new tab)
- git.kernel.org/stable/c/bf9848a22a8e50d39d5e8d871581f0a8110f16b3 (opens in a new tab)
- git.kernel.org/stable/c/c2e1d33929565fa14c48d8a5a45edc3ebfc941b2 (opens in a new tab)
- git.kernel.org/stable/c/ee5fb641c4ccac8406c668d3e947eb20ce44f233 (opens in a new tab)