CVE-2026-74566

In the Linux kernel, the following vulnerability has been resolved:

keys: make keyring key-chunk byte order agree with keyring_diff_objects()

keyring_get_key_chunk() loads description bytes into the index chunk low

address first, while keyring_diff_objects() numbers the first differing

bit from the low end and folds the absolute byte index into the level

without removing the inline-prefix offset the level already carries.

The two disagree on byte order and bit position, so the array can be

told two keys first differ at a bit that does not differ in the chunk

the walker uses, letting crafted descriptions collide into one node.

Load the chunk in the order keyring_diff_objects() assumes and drop the

inline-prefix length when folding the byte index into the level. This

only changes the in-memory ordering used to place keys within a keyring;

add, search and read of non-colliding keys are unaffected.