CVE-2026-90209
Received
Received - Intake
BaseFortify
Vulnerability report for CVE-2026-90209, including description, CVSS score, EPSS score, affected products, exploitability, helpful resources, and attack-flow context.
Publication date: 2026-09-17
Last updated on: 2026-09-17
Assigner: kernel.org
Description
Description
In the Linux kernel, the following vulnerability has been resolved:
s390/debug: Fix deadlock during unregister
Unregistering an s390dbf debug area while one of the associated debugfs
files is being written to can cause a deadlock:
$ echo >.../vmur/level $ rmmod vmur
===================================================
debugfs write
debugfs_file_get()
debug_unregister()
mutex_lock(debug_mutex)
debugfs_remove()
wait for debugfs_file_put()
debug_file_ops.write()
debug_input()
mutex_lock(debug_mutex) ==> DEADLOCK
Fix this by splitting debug_unregister() into an s390dbf and debugfs
part, and running only the s390dbf part with debug_mutex locked.
CVSS Scores
EPSS Scores
| Probability: | |
| Percentile: |
Meta Information
Affected Vendors & Products
| Vendor | Product | Version / Range |
|---|---|---|
| Linux | Linux | 9372a82892c2caa6bccab9a4081166fa769699f8 |
| Linux | Linux | 9372a82892c2caa6bccab9a4081166fa769699f8 |
| Linux | Linux | 9372a82892c2caa6bccab9a4081166fa769699f8 |
| Linux | Linux | 9372a82892c2caa6bccab9a4081166fa769699f8 |
| Linux | Linux | 9372a82892c2caa6bccab9a4081166fa769699f8 |
| Linux | Linux | 9372a82892c2caa6bccab9a4081166fa769699f8 |
| Linux | Linux | 9372a82892c2caa6bccab9a4081166fa769699f8 |
| Linux | Linux | c68ba4a708fbd0efdc384cd29250bb292a45e559 |
| Linux | Linux | 86f9980909f31ab205323eeeb290fe3cbb4952b4 |
| Linux | Linux | fe5793e90d3f572a87ba67fe2f0e1679fdff14f8 |
| Linux | Linux | e234f66168f0d50c0d28154fb983a14e85c3c526 |
| Linux | Linux | 5.4.146 |
| Linux | Linux | 5.10.65 |
| Linux | Linux | 5.13.17 |
| Linux | Linux | 5.14.4 |
| Linux | Linux | 5.15 |
Helpful Resources
Exploitability
CWE
KEV
| CWE ID | Description |
|---|---|
| CWE-UNKNOWN |
