wifi: mwifiex: fix NULL dereference when the AP has HT-cap but no HT-oper

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Summary

CVECVE-2026-68197
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-08-10 13:20:07 UTC
Updated2026-08-10 13:20:07 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: wifi: mwifiex: fix NULL dereference when the AP has HT-cap but no HT-oper mwifiex_tdls_add_ht_oper() gates its follow-the-AP-bandwidth path on bss_desc->bcn_ht_cap being present, but then dereferences a different pointer, bss_desc->bcn_ht_oper: if (ISSUPP_CHANWIDTH40(priv->adapter->hw_dot_11n_dev_cap) && bss_desc->bcn_ht_cap && ISALLOWED_CHANWIDTH40(bss_desc->bcn_ht_oper->ht_param)) bcn_ht_cap and bcn_ht_oper are populated independently while parsing the associated AP's beacon in mwifiex_update_bss_desc_with_ie(): an AP that advertises an HT Capabilities element but no HT Operation element leaves bcn_ht_cap non-NULL and bcn_ht_oper NULL. Setting up a TDLS link to a peer while associated to such an AP then dereferences the NULL bcn_ht_oper and crashes the kernel. Every other bcn_ht_oper user in the driver NULL-checks it first. Guard on the pointer that is actually dereferenced. Found by 0sec automated security-research tooling (https://0sec.ai).

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected 396939f94084d5923d558e9f22db48bc51156e47 eb42c3c8fd479166c42984728754cd779c71fd60 git Not specified
CNA Linux Linux affected 396939f94084d5923d558e9f22db48bc51156e47 45011e4d9ba3f2182e5df64be65888044fa20771 git Not specified
CNA Linux Linux affected 396939f94084d5923d558e9f22db48bc51156e47 9375a4ea4121625ef27a46b74781cda66a5cc61b git Not specified
CNA Linux Linux affected 396939f94084d5923d558e9f22db48bc51156e47 cca4398aa305c22016d1714f388e2fa6ea4e5ad4 git Not specified
CNA Linux Linux affected 396939f94084d5923d558e9f22db48bc51156e47 c3d68e294cbb6a4090bb219d3dcaca85a011809b git Not specified
CNA Linux Linux affected 3.16 Not specified
CNA Linux Linux unaffected 3.16 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-rc5 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/45011e4d9ba3f2182e5df64be65888044fa20771 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c3d68e294cbb6a4090bb219d3dcaca85a011809b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/eb42c3c8fd479166c42984728754cd779c71fd60 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/9375a4ea4121625ef27a46b74781cda66a5cc61b 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/cca4398aa305c22016d1714f388e2fa6ea4e5ad4 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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