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CVE-2026-74585— thunderbolt: Bound the DROM dual link port number before indexing sw->ports

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： thunderbolt： 在索引 之前，对 DROM 双链路端口号进行边界检查。 函数在索引 数组之前，会校验设备提供的 是否不超过 。然而， 字段（同样从 DROM 读取的 6 位值）在索引同一个数组时，却没有进行此类边界检查。恶意或格式错误的 Thunderbolt 设备可以将 设置为超出已分配的 范围（共 个条目），从而产生一个越界的 指针，该指针会被存储并在后续被解引用。 现采取的措施是：若某端口条目的 超过 ，则拒绝该条目，这与已应用于 的边界检查规则保持一致。

AI Predicted 6.5 Difficulty: Moderate EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6< 6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c affected
cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6< 3d3c212b70633332ab71672aa2bc6af257d2ec83 affected
cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6< b98e1e28bd95b0fa33164eec1e763d26c7058b39 affected
cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6< 50f0c8dd8c3390f851cfb97ca13116f9ee6469d1 affected
cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6< f28066057134aa9294caa597b670daf505ad9dce affected
cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6< 40d2ffb74094cf36edbe05855566a4c58b6ce808 affected
cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6< f32c3a9a77cfb50934a60b05d5407649af062535 affected
cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6< d6764992f17b23d91ff93ce905ab53c2aa7191f0 affected
… +10 more rows
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I. Basic Information for CVE-2026-74585

Vulnerability Information
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Vulnerability Title
thunderbolt: Bound the DROM dual link port number before indexing sw->ports
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: thunderbolt: Bound the DROM dual link port number before indexing sw->ports tb_drom_parse_entry_port() validates the device-supplied header->index against sw->config.max_port_number before indexing sw->ports[], but the sibling field entry->dual_link_port_nr -- a 6-bit value also read from the DROM -- indexes the same array with no such check. A malicious or malformed Thunderbolt device can set dual_link_port_nr beyond the allocated sw->ports[] (max_port_number + 1 entries), producing an out-of-bounds tb_port pointer that is stored and later dereferenced. Reject a port entry whose dual_link_port_nr exceeds max_port_number, the same bound already applied to header->index.
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 cd22e73bdf5eff7e68a0f8bdfbce123ad43651f6 ~ 6c892ed9f4129ae40ef0f92e1bb31aa0b0ddc72c -
Linux Linux 3.17 -

II. Public POCs for CVE-2026-74585

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III. Intelligence Information for CVE-2026-74585

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Patches & Fixes for CVE-2026-74585 (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-2026-74617 9.8 CRITICAL dibs: initialise dibs->lock in dibs_dev_alloc()
CVE-2026-74628 9.8 CRITICAL net/x25: fix use-after-free of the socket by its timers
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-2026-74611 9.8 CRITICAL tls: rx: restore msg_iter before TLS 1.3 optimistic retry
CVE-2026-74669 9.8 CRITICAL ipvs: clear IPv4 options after rebasing tunnel ICMP errors
CVE-2026-74597 9.8 CRITICAL ip6_tunnel: clear skb2->cb[] in ip6ip6_err()
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-2026-74730 9.8 CRITICAL NFS: Pin the 'struct nfs_server' during a FREE_STATEID call
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-2026-74688 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-2026-74608 9.8 CRITICAL smb: client: Fix use-after-free in cifs_try_adding_channels()
CVE-2026-74616 9.8 CRITICAL xdp: reject clones that overrun skb_shared_info tailroom
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

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