CVE-2026-74683

Summary

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

Input: evdev - sanitize event type index when fetching event masks

The user-supplied event type index passed to EVIOCGMASK / EVIOCSMASK ioctls is used to index the static counts array in evdev_get_mask_cnt() and client evmasks array in evdev_get_mask().

While the event type is architecturally bounded by EV_CNT, speculative execution may mispredict bounds checks and perform out-of-bounds loads.

Sanitize the event type index in evdev_get_mask_cnt() branchlessly using array_index_mask_nospec(). This clamps the index to 0 for safe array access and forces the returned count to 0 speculatively when the index is out of bounds.

We do not need additional array_index_nospec() calls in evdev_get_mask() because evdev_get_mask_cnt() speculatively forces the count (and resulting xfer_size) to 0 for out-of-bounds types, preventing any speculative memory access to client evmasks array.

Affected Software

Weaknesses

References

• https://git.kernel.org/stable/c/c79b08d8fa230871a3634e34a66e591ac2d084ef
• https://git.kernel.org/stable/c/f27fa9b39f925d26e034a1f382cb45523138f4ae
• https://git.kernel.org/stable/c/f3fc329acad9a71b3c077237cbac20670d2358c8
• https://git.kernel.org/stable/c/5db341189bb7ff041d570dbe36ecca7e32913927
• https://git.kernel.org/stable/c/433913b4a92214d76e9f0c03ad9128fec943d5f8
• https://git.kernel.org/stable/c/4034ef247a9dde3f56660b01f0c3280dac6b1274
• https://git.kernel.org/stable/c/810e1883d4815f29c30d900ad7333d03cc2515d1
• https://git.kernel.org/stable/c/3abd29c61d2ef37c4102cf755b18be53bb9dbea6

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