CVE-2026-93106crash_dump: release keyring reference at the correct time
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: 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.
- 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
- Sep 17, 2026
- First seen by InfoSec Signals
- Oct 9, 2026
Affected products
Linux Linux linux:linux (from the name) | from 62f17d9df6924cf805de5ae970470615c1c8d9f2 before b0f7343a002f9c8b8378011f60482c76f3216dfd; from 62f17d9df6924cf805de5ae970470615c1c8d9f2 before ed566979f99c5516cad45a76ae25e2a4928ffb67; from 62f17d9df6924cf805de5ae970470615c1c8d9f2 before ada2e5a44e99113e08ad9b7b71396c6c572204da | CNA record |
References
- https://git.kernel.org/stable/c/b0f7343a002f9c8b8378011f60482c76f3216dfd
- https://git.kernel.org/stable/c/ed566979f99c5516cad45a76ae25e2a4928ffb67
- https://git.kernel.org/stable/c/ada2e5a44e99113e08ad9b7b71396c6c572204da
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.