Bug 2540562 (CVE-2026-93802) - CVE-2026-93802 kernel: wifi: rsi: validate beacon length before fixed buffer copy
Summary: CVE-2026-93802 kernel: wifi: rsi: validate beacon length before fixed buffer ...
Keywords:
Status: NEW
Alias: CVE-2026-93802
Product: Security Response
Classification: Other
Component: vulnerability
Version: unspecified
Hardware: All
OS: Linux
medium
medium
Target Milestone: ---
Assignee: Product Security DevOps Team
QA Contact:
URL:
Whiteboard:
Depends On:
Blocks:
TreeView+ depends on / blocked
 
Reported: 2026-09-24 17:16 UTC by OSIDB Bzimport
Modified: 2026-09-28 12:22 UTC (History)
17 users (show)

Fixed In Version:
Clone Of:
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Description OSIDB Bzimport 2026-09-24 17:16:23 UTC 
In the Linux kernel, the following vulnerability has been resolved:

wifi: rsi: validate beacon length before fixed buffer copy

rsi_prepare_beacon() copies the mac80211 beacon frame after
FRAME_DESC_SZ into a management skb whose usable tailroom may be smaller
than MAX_MGMT_PKT_SIZE after alignment.

Validate the beacon length against the actual tailroom before the copy
and skb_put(). Leave ownership of the management skb with the caller on
error, matching the existing rsi_send_beacon() cleanup path.
Comment 1 Mauro Matteo Cascella 2026-09-28 12:18:20 UTC 
Upstream advisory:
https://git.kernel.org/pub/scm/linux/security/vulns.git/plain/cve/published/2026/CVE-2026-93802.mbox
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