CVE-2026-93106: Linux

Описание

Оригинално описание

In the Linux kernel, the following vulnerability has been resolved: crash_dump: release keyring reference at the correct time restore_dm_crypt_keys_to_thread_keyring() gets a reference to the user keyring before restoring the saved dm-crypt keys. The same keyring reference is then passed to add_key_to_keyring() for each saved key, but add_key_to_keyring() drops that reference on every call. This is only balanced when exactly one key is restored. With multiple keys, the keyring reference is dropped too many times and may trigger a refcount underflow or use-after-free. When more than five keys are restored, a refcount underflow/use-after-free warning can be triggered. The early error paths after lookup_user_key() also return without dropping the keyring reference. Keep ownership of the keyring reference in restore_dm_crypt_keys_to_thread_keyring(), drop it once on all exit paths, and make add_key_to_keyring() only use the reference without consuming it.

Засегнати продукти

• Linux Linux: 62f17d9df6924cf805de5ae970470615c1c8d9f2 преди b0f7343a002f9c8b8378011f60482c76f3216dfd; 62f17d9df6924cf805de5ae970470615c1c8d9f2 преди ed566979f99c5516cad45a76ae25e2a4928ffb67; 62f17d9df6924cf805de5ae970470615c1c8d9f2 преди ada2e5a44e99113e08ad9b7b71396c6c572204da
• Linux Linux: 6.16; преди 6.16; 6.18.52 до 6.18.*; 7.2.6 до 7.2.*; от 7.3 нататък

История

Други уязвимости в Linux Linux

• 8.1CVE-2026-99270
• 7.8CVE-2026-99269
• CVE-2026-99265
• CVE-2026-99261
• CVE-2026-99260

Първоизточници

• https://www.cve.org/CVERecord?id=CVE-2026-93106
• https://nvd.nist.gov/vuln/detail/CVE-2026-93106
• https://git.kernel.org/stable/c/b0f7343a002f9c8b8378011f60482c76f3216dfd
• https://git.kernel.org/stable/c/ed566979f99c5516cad45a76ae25e2a4928ffb67
• https://git.kernel.org/stable/c/ada2e5a44e99113e08ad9b7b71396c6c572204da