CVE-2026-90209
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.
How to fix
- Linux Linuxa214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed, 183f8f6d64bb0510070c856b9927618c53014a7b, a08b70ed2d1ec907353a72f15163b8e34ff4b2f8, 45bb341d1b73eb293e0dd43d9b72bbc8b615d0ba, 5d83f3faa3fb7f23f298cfd40382611999de5d1d, 54e1259b75d6402a1d0cfb822b9bb2c507e53dab, 445c31ac638fd1af203d79bdf25fc0cb3149fbbc, 5.5, 5.11, 5.14, 5.15 or later
Affected products
| Product | Affected versions | Fixed in |
|---|---|---|
| Linux Linux | 9372a82892c2caa6bccab9a4081166fa769699f8 ≤ v < a214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed, 9372a82892c2caa6bccab9a4081166fa769699f8 ≤ v < 183f8f6d64bb0510070c856b9927618c53014a7b, 9372a82892c2caa6bccab9a4081166fa769699f8 ≤ v < a08b70ed2d1ec907353a72f15163b8e34ff4b2f8, 9372a82892c2caa6bccab9a4081166fa769699f8 ≤ v < 45bb341d1b73eb293e0dd43d9b72bbc8b615d0ba, 9372a82892c2caa6bccab9a4081166fa769699f8 ≤ v < 5d83f3faa3fb7f23f298cfd40382611999de5d1d, 9372a82892c2caa6bccab9a4081166fa769699f8 ≤ v < 54e1259b75d6402a1d0cfb822b9bb2c507e53dab, 9372a82892c2caa6bccab9a4081166fa769699f8 ≤ v < 445c31ac638fd1af203d79bdf25fc0cb3149fbbc, c68ba4a708fbd0efdc384cd29250bb292a45e559, 86f9980909f31ab205323eeeb290fe3cbb4952b4, fe5793e90d3f572a87ba67fe2f0e1679fdff14f8, e234f66168f0d50c0d28154fb983a14e85c3c526, 5.4.146 ≤ v < 5.5, 5.10.65 ≤ v < 5.11, 5.13.17 ≤ v < 5.14, 5.14.4 ≤ v < 5.15, 5.15 | a214c3dacc779b2afcb0ac9c8001e45ee4ffb2ed, 183f8f6d64bb0510070c856b9927618c53014a7b, a08b70ed2d1ec907353a72f15163b8e34ff4b2f8, 45bb341d1b73eb293e0dd43d9b72bbc8b615d0ba, 5d83f3faa3fb7f23f298cfd40382611999de5d1d, 54e1259b75d6402a1d0cfb822b9bb2c507e53dab, 445c31ac638fd1af203d79bdf25fc0cb3149fbbc, 5.5, 5.11, 5.14, 5.15 |
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