CVE-2026-23246
Undergoing Analysis Undergoing Analysis - In Progress
Stack Out-of-Bounds Write in Linux mac80211 WiFi Component

Publication date: 2026-03-18

Last updated on: 2026-05-22

Assigner: kernel.org

Description
In the Linux kernel, the following vulnerability has been resolved: wifi: mac80211: bounds-check link_id in ieee80211_ml_reconfiguration link_id is taken from the ML Reconfiguration element (control & 0x000f), so it can be 0..15. link_removal_timeout[] has IEEE80211_MLD_MAX_NUM_LINKS (15) elements, so index 15 is out-of-bounds. Skip subelements with link_id >= IEEE80211_MLD_MAX_NUM_LINKS to avoid a stack out-of-bounds write.
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Meta Information
Published
2026-03-18
Last Modified
2026-05-22
Generated
2026-06-16
AI Q&A
2026-03-18
EPSS Evaluated
2026-06-15
NVD
CVE-2026-23246
EUVD
EUVD-2026-12809
Affected Vendors & Products
Showing 6 associated CPEs
Vendor Product Version / Range
linux linux_kernel 6.5
linux linux_kernel From 6.19 (inc) to 6.19.7 (exc)
linux linux_kernel 7.0
linux linux_kernel From 6.13 (inc) to 6.18.17 (exc)
linux linux_kernel From 6.7 (inc) to 6.12.77 (exc)
linux linux_kernel From 6.5.1 (inc) to 6.6.130 (exc)
Helpful Resources
Exploitability
CWE
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KEV
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CWE ID Description
CWE-129 The product uses untrusted input when calculating or using an array index, but the product does not validate or incorrectly validates the index to ensure the index references a valid position within the array.
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Executive Summary

This vulnerability exists in the Linux kernel's wifi mac80211 component, specifically in the handling of the ML Reconfiguration element. The issue arises because the link_id value, derived from the ML Reconfiguration element, can range from 0 to 15, but the array link_removal_timeout[] only has 15 elements (indexed 0 to 14). When link_id equals 15, it causes an out-of-bounds write on the stack. The fix involves skipping subelements where link_id is greater than or equal to the maximum allowed number of links to prevent this out-of-bounds write.

Impact Analysis

An out-of-bounds write vulnerability like this can lead to memory corruption, which may cause system instability, crashes, or potentially allow an attacker to execute arbitrary code with kernel privileges. This could compromise the security and reliability of the affected system.

Compliance Impact

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