CVE-2026-74683

Description

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.

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EPSS — Exploit Prediction

0.0019

Probability of exploitation

0.09%

Percentile rank

EPSS estimates the probability that this vulnerability will be exploited in the wild within the next 30 days. A higher score means more likely to be exploited.

References

Other References

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

Frequently Asked Questions

What is CVE-2026-74683? +

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.

How do I check if I'm vulnerable to CVE-2026-74683? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.