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CVE-2026-74676— vt: add permission check for KDSKBMETA ioctl

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，已解决以下漏洞： vt: 为 KDSKBMETA ioctl 添加权限检查 KDSKBMETA 用于修改键盘元模式，但缺乏其他 vt_k_ioctl() 中键盘设置类 ioctl 都强制执行的权限检查（perm check）。这使得进程无需授权即可在非控制台上更改元模式。

AI Predicted 7.8 Difficulty: Easy EPSS 0.18% · P7

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 9f8cbaf4b774694dcc292e60509762483ebfd9ae affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< ddc4a8303347114e945b9e6e81b81d77855f7358 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 1c5b67a1e2cb7d78dab321280f330b056e3bf437 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< d8ead5083b203d12b8319e7cb29cc6b8836e813f affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 4671c3b79e337bbae28c2d79023dc642df012bde affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< a1c31e026c93e378e297a8df8328983d3013a59f affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 7bf32337a7103ccb686cbd240324bf26225ef2d6 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< a7ad0034453ba4c353f9b8f810ee2569de33d283 affected
… +10 more rows
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I. Basic Information for CVE-2026-74676

Vulnerability Information
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Vulnerability Title
vt: add permission check for KDSKBMETA ioctl
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vt: add permission check for KDSKBMETA ioctl KDSKBMETA modifies keyboard meta mode but lacks the !perm check that all other keyboard setter ioctls in vt_k_ioctl() enforce, allowing a process to change meta mode on a non-controlling console without authorization.
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 9f8cbaf4b774694dcc292e60509762483ebfd9ae -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-74676

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III. Intelligence Information for CVE-2026-74676

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Patches & Fixes for CVE-2026-74676 (7)

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-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
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-2026-74676

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