Bug 2396934 (CVE-2025-39864) - CVE-2025-39864 kernel: wifi: cfg80211: fix use-after-free in cmp_bss()
Summary: CVE-2025-39864 kernel: wifi: cfg80211: fix use-after-free in cmp_bss()
Keywords:
Status: NEW
Alias: CVE-2025-39864
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: 2025-09-19 16:02 UTC by OSIDB Bzimport
Modified: 2025-09-26 22:32 UTC (History)
0 users

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Description OSIDB Bzimport 2025-09-19 16:02:36 UTC 
In the Linux kernel, the following vulnerability has been resolved:

wifi: cfg80211: fix use-after-free in cmp_bss()

Following bss_free() quirk introduced in commit 776b3580178f
("cfg80211: track hidden SSID networks properly"), adjust
cfg80211_update_known_bss() to free the last beacon frame
elements only if they're not shared via the corresponding
'hidden_beacon_bss' pointer.
Comment 1 Jon Moroney 2025-09-19 16:48:11 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025091906-CVE-2025-39864-a3a2@gregkh/T
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