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CVE-2026-74675— vt: stabilize tty reference in kbd_keycode with tty_port_tty_get

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： vt：在 kbd_keycode 中通过 tty_port_tty_get 稳定 tty 引用 kbd_keycode() 函数在获取 vc->port.tty 时未获取 tty 引用，从而可能与 con_shutdown() 发生竞争条件。con_shutdown() 在不同锁的保护下会清空 port.tty。为解决此问题，应使用 tty_port_tty_get()/tty_kref_put() 在需要 tty 指针的整个期间持有适当的引用计数。

CVSS 7.8 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b84fd400f80adf4d1c88fbce50ae1cf2f8119e65 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 38400673c9bfb39cfc87539e1a072087e98f4e4f affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< cab5a342f0589334046741006d8a280514f94235 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 38a0aa593ebc275aea6f79534d07f44e43768ce6 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 3f6b1d3fcfc26dc3fc85262f753439df93b055b4 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< b664592e9ba8c47c9e23408db7ba52eb9f946c8a affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< cc4a1a2ce0c58eafd477effb055863935260ddc1 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< e25d47a526939ad44b75f778b8a7500562b84fc1 affected
… +10 more rows
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I. Basic Information for CVE-2026-74675

Vulnerability Information
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Vulnerability Title
vt: stabilize tty reference in kbd_keycode with tty_port_tty_get
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: vt: stabilize tty reference in kbd_keycode with tty_port_tty_get kbd_keycode() reads vc->port.tty without acquiring a tty reference, racing against con_shutdown() which clears port.tty under a different lock. Use tty_port_tty_get()/tty_kref_put() to hold a proper reference for the duration the tty pointer is needed.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
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 ~ b84fd400f80adf4d1c88fbce50ae1cf2f8119e65 -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2026-74675

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III. Intelligence Information for CVE-2026-74675

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Patches & Fixes for CVE-2026-74675 (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-2026-74616 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-2026-74662 9.8 CRITICAL inet: frags: publish queues before arming timer
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-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
CVE-2026-74587 9.8 CRITICAL sctp: fix use-after-free of cached ASCONF chunk
CVE-2026-74588 9.8 CRITICAL sctp: keep chunk->transport in step with the list it is queued on
CVE-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
CVE-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74727 9.8 CRITICAL ovpn: skip rehash for peers already removed from by_id
CVE-2026-74586 9.8 CRITICAL sctp: clear new_transport when removing a peer
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
CVE-2026-74688 9.8 CRITICAL sctp: clear control chunk transport if it is being removed
CVE-2026-74723 9.8 CRITICAL btrfs: lzo: reject inline extents without valid headers
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-2026-74675

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