CVE-2026-93106

CVE CVE-2026-93106EUVD EUVD-2026-82214Published 2026-09-17T16:11:17.000Z

What the advisory describes

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.

Source: EUVD (ENISA), in the words of the advisory.

Products the advisory names

These come from the advisory itself, not from any check we performed.

• Linux — Linux 62f17d9df6924cf805de5ae970470615c1c8d9f2 <b0f7343a002f9c8b8378011f60482c76f3216dfd; patch: 7.2.6; patch: 6.18.52; 62f17d9df6924cf805de5ae970470615c1c8d9f2 <ed566979f99c5516cad45a76ae25e2a4928ffb67; patch: 7.3-rc1; 6.16; patch: 0; 62f17d9df6924cf805de5ae970470615c1c8d9f2 <ada2e5a44e99113e08ad9b7b71396c6c572204da

The versions shown are the advisory's own. Patchlage compares no version numbers and derives no judgement from them — which version is installed is something a person has to look up.

Carried in the product catalogue

An estate covering these products can be recorded in Patchlage. An advisory about them appears in the next morning's situation report.

• Linux — Linux

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