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CVE-2026-74409

wifi: rtw89: add bounds check on firmware mac_id in link lookup

HIGH
8.8
CVSS Score
Published: August 15, 2026 at 05:59 AM UTC
Updated: October 16, 2026 at 08:17 PM UTC
1 product affected across 1 vendorLinux Kernel

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Severity
HIGH8.8
Exploit prediction
EPSS 0.4%
SSVC
No known exploit

Description

In the Linux kernel, the following vulnerability has been resolved: wifi: rtw89: add bounds check on firmware mac_id in link lookup The mac_id field in RX descriptors is 8 bits wide (0-255), but assoc_link_on_macid[] has only RTW89_MAX_MAC_ID_NUM (128) entries. While the driver currently assigns mac_id values below 128, the descriptor value comes from firmware and is not validated before use as an array index. Add a defensive bounds check in rtw89_assoc_link_rcu_dereference() to guard against out-of-range firmware values.

Affected

Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.

Linux Kernel· Linux
90%
144c6cd24b3556e6e7a14271cee57a42ebf974506.14
Vendor states this is fixed in 6d88244bb129755acca696f9227200f4a2d106a6 (fixed)
Vendor states this is fixed in 920101305e7601a33b9e01019f4ca526af2526ae (fixed)
Vendor states this is fixed in ad445de67359f24088d4305c05fbd7e34c4e35e3 (fixed)
Vendor states this is fixed in 6.14 (unaffected)
Vendor states this is fixed in 6.18.40 (unaffected)
Vendor states this is fixed in 7.1.5 (unaffected)
Vendor states this is fixed in 7.2 (unaffected)

Remediation

No guide yet

No remediation guidance has been written for this CVE yet, and no fixed version or vendor advisory is recorded against it.

References (3)

Source: cverecord
https://git.kernel.org/stable/c/ad445de67359f24088d4305c05fbd7e34c4e35e3
Source: cverecord
https://git.kernel.org/stable/c/920101305e7601a33b9e01019f4ca526af2526ae
Source: cverecord
https://git.kernel.org/stable/c/6d88244bb129755acca696f9227200f4a2d106a6

SSVC — Action Prioritization

SSVCNo known exploitNot automatableTotal impact

SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.

CVSS

8.8HIGHLinux
Vector?

Quick Info

StatusRECEIVED

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