CVSS 5.5 · Medium EPSS 0,26%
Kerentanan NULL Pointer Dereference pada linux kernel. Skor CVSS 3.1 5.5 (Medium) menurut NVD.
In the Linux kernel, the following vulnerability has been resolved: net: hso: fix null-ptr-deref during tty device unregistration Multiple ttys try to claim the same the minor number causing a double unregistration of the same device. The first unregistration succeeds but the next one results in a null-ptr-deref. The get_free_serial_index() function returns an available minor number but doesn't assign it immediately. The assignment is done by the caller later. But before this assignment, calls to get_free_serial_index() would return the same minor number. Fix this by modifying get_free_serial_index to assign the minor number immediately after one is found to be and rename it to obtain_minor() to better reflect what it does. Similary, rename set_serial_by_index() to release_minor() and modify it to free up the minor number of the given hso_serial. Every obtain_minor() should have corresponding release_minor() call.
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
· uraikan di kalkulator | Vendor | Produk | Versi terdampak |
|---|---|---|
| linux | linux kernel | Versi 2.6.27 hingga sebelum 4.4.268 |
| linux | linux kernel | Versi 4.5.0 hingga sebelum 4.9.268 |
| linux | linux kernel | Versi 4.10.0 hingga sebelum 4.14.232 |
| linux | linux kernel | Versi 4.15.0 hingga sebelum 4.19.187 |
| linux | linux kernel | Versi 4.20.0 hingga sebelum 5.4.112 |
| linux | linux kernel | Versi 5.5.0 hingga sebelum 5.10.30 |
| linux | linux kernel | Versi 5.11.0 hingga sebelum 5.11.14 |