CVE-2026-90209s390/debug: Fix deadlock during unregister
Updated under an hour ago ()
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No exploitation reported and no EPSS estimate yet.
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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
- Not yet scored
- Weakness (CWE)
- Not given
- Known exploited
- Not in CISA's KEV catalog
- EPSS (exploitation in the next 30 days)
- Not loaded for this CVE
- Assigned by
- Linux
- NVD analysis
- Received
- Record last updated
- Oct 19, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 9372a82892c2caa6bccab9a4081166fa769699f8 before a214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed; 9372a82892c2caa6bccab9a4081166fa769699f8 builds before 183f8f6d64bb0510070c856b9927618c53014a7b; from 9372a82892c2caa6bccab9a4081166fa769699f8 before a08b70ed2d1ec907353a72f15163b8e34ff4b2f8; 9372a82892c2caa6bccab9a4081166fa769699f8 builds before 45bb341d1b73eb293e0dd43d9b72bbc8b615d0ba; 9372a82892c2caa6bccab9a4081166fa769699f8 builds before 5d83f3faa3fb7f23f298cfd40382611999de5d1d; 9372a82892c2caa6bccab9a4081166fa769699f8 builds before 54e1259b75d6402a1d0cfb822b9bb2c507e53dab; 9372a82892c2caa6bccab9a4081166fa769699f8 builds before 445c31ac638fd1af203d79bdf25fc0cb3149fbbc; c68ba4a708fbd0efdc384cd29250bb292a45e559; and 7 more ranges | CNA record |
References
- https://git.kernel.org/stable/c/a214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed
- https://git.kernel.org/stable/c/183f8f6d64bb0510070c856b9927618c53014a7b
- https://git.kernel.org/stable/c/a08b70ed2d1ec907353a72f15163b8e34ff4b2f8
- https://git.kernel.org/stable/c/45bb341d1b73eb293e0dd43d9b72bbc8b615d0ba
- https://git.kernel.org/stable/c/5d83f3faa3fb7f23f298cfd40382611999de5d1d
- https://git.kernel.org/stable/c/54e1259b75d6402a1d0cfb822b9bb2c507e53dab
- https://git.kernel.org/stable/c/445c31ac638fd1af203d79bdf25fc0cb3149fbbc
The CVE record on cve.org NVD's entry
The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.