wifi: cfg80211: bound element ID read when checking non-inheritance

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-68402
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:33 UTC
Updated2026-08-13 23:17:35 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: wifi: cfg80211: bound element ID read when checking non-inheritance cfg80211_is_element_inherited() reads the first data octet of the candidate element (id = elem->data[0]) to look it up in an extension non-inheritance list. It does so after testing elem->id, but without verifying that the element actually has a data octet. A zero-length extension element (WLAN_EID_EXTENSION with length 0) therefore makes it read one octet past the end of the element. _ieee802_11_parse_elems_full() runs this check for every element of a frame once a non-inheritance context exists -- e.g. while parsing a per-STA profile of a Multi-Link element in a (re)association response, or a non-transmitted BSS profile -- so a crafted frame from an AP can trigger a one-octet slab-out-of-bounds read during element parsing: BUG: KASAN: slab-out-of-bounds in cfg80211_is_element_inherited Read of size 1 ... in net/wireless/scan.c Return early (treat the element as inherited) when an extension element carries no data, mirroring the existing handling of empty ID lists. The bug was found by fuzzing ieee802_11_parse_elems_full() under KASAN.

Risk And Classification

Primary CVSS: v3.1 7.1 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

EPSS: 0.001680000 probability, percentile 0.064110000 (date 2026-08-13)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
3.1CNADECLARED7.1HIGHCVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

CVSS v3.1 Breakdown

Attack Vector
Adjacent
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
Low
Integrity
None
Availability
High

CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3 20c308d9a57722801961f816395bf825f7bde6bc git Not specified
CNA Linux Linux affected f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3 84bd907361c56fbd5523eceb2682cb39da059bd5 git Not specified
CNA Linux Linux affected f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3 11ac7a5e75f5132f1778e0c60981d30dc29fb869 git Not specified
CNA Linux Linux affected f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3 ddf2773bcc8e49a43c561f22ec1e7924215d7947 git Not specified
CNA Linux Linux affected f7dacfb11475ba777e1e84ccec2e14b0ba5a17a3 cb8afea4655ff004fa7feee825d5c79783525383 git Not specified
CNA Linux Linux affected 5.2 Not specified
CNA Linux Linux unaffected 5.2 semver Not specified
CNA Linux Linux unaffected 6.6.148 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.101 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.42 6.18.* semver Not specified
CNA Linux Linux unaffected 7.1.6 7.1.* semver Not specified
CNA Linux Linux unaffected 7.2-rc4 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/20c308d9a57722801961f816395bf825f7bde6bc 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/84bd907361c56fbd5523eceb2682cb39da059bd5 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/11ac7a5e75f5132f1778e0c60981d30dc29fb869 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cb8afea4655ff004fa7feee825d5c79783525383 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ddf2773bcc8e49a43c561f22ec1e7924215d7947 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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