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CVE-2026-74683— Input: evdev - sanitize event type index when fetching event masks

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

在 Linux 内核中，已修复以下漏洞： 输入子系统 evdev：获取事件掩码时，对事件类型索引进行规范化处理 用户提供的、传递给 / ioctl 系统调用的事件类型索引，会被用于在 函数中索引静态的 数组，以及在 函数中索引客户端的 数组。 虽然从架构层面看，事件类型已被 限制，但推测执行可能错误地预测边界检查，从而执行越界加载操作。 在 分支中，使用 无分支地规范化事件类型索引。这会将越界的索引钳位（clamp）为 0，以确保安全的数组访问，并在推测执行中当索引越界时，强制将返回的计数值设为 0。 我们无需在

AI Predicted 7.8 Difficulty: Easy EPSS 0.19% · P9

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 06a16293f71927f756dcf37558a79c0b05a91641< c79b08d8fa230871a3634e34a66e591ac2d084ef affected
06a16293f71927f756dcf37558a79c0b05a91641< f27fa9b39f925d26e034a1f382cb45523138f4ae affected
06a16293f71927f756dcf37558a79c0b05a91641< f3fc329acad9a71b3c077237cbac20670d2358c8 affected
06a16293f71927f756dcf37558a79c0b05a91641< 5db341189bb7ff041d570dbe36ecca7e32913927 affected
06a16293f71927f756dcf37558a79c0b05a91641< 433913b4a92214d76e9f0c03ad9128fec943d5f8 affected
06a16293f71927f756dcf37558a79c0b05a91641< 4034ef247a9dde3f56660b01f0c3280dac6b1274 affected
06a16293f71927f756dcf37558a79c0b05a91641< 810e1883d4815f29c30d900ad7333d03cc2515d1 affected
06a16293f71927f756dcf37558a79c0b05a91641< 3abd29c61d2ef37c4102cf755b18be53bb9dbea6 affected
… +10 more rows
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I. Basic Information for CVE-2026-74683

Vulnerability Information
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Vulnerability Title
Input: evdev - sanitize event type index when fetching event masks
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 06a16293f71927f756dcf37558a79c0b05a91641 ~ c79b08d8fa230871a3634e34a66e591ac2d084ef -
Linux Linux 4.4 -

II. Public POCs for CVE-2026-74683

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III. Intelligence Information for CVE-2026-74683

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Patches & Fixes for CVE-2026-74683 (8)

Same Patch Batch · Linux · 2026-08-22 · 150 CVEs total

CVE-2026-74705 10.0 CRITICAL udp: fix potential use-after-free in tunnel segmentation
CVE-2026-74612 10.0 CRITICAL veth: fix skb length accounting after XDP frag adjustment
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
CVE-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
CVE-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
CVE-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
CVE-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
CVE-2026-74591 9.8 CRITICAL mm/filemap: __filemap_add_folio() restore index before retrying
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
CVE-2026-74712 9.3 CRITICAL vdpa/mlx5: Fix buffer length in create_direct_keys()
CVE-2026-74665 9.1 CRITICAL net: fix skb length accounting after generic XDP frag adjustment

Showing top 20 of 150 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74683

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