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CVE-2025-39864— wifi: cfg80211: fix use-after-free in cmp_bss()

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于cfg80211_update_known_bss函数中未正确处理隐藏SSID网络，可能导致释放后重用。

CVSS 8.8 · High EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1202 · Indirect Command Execution

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6< a8bb681e879ca3c9f722aa08d3d7ae41c42a8807 affected
3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6< a97a9791e455bb0cd5e7a38b5abcb05523d4e21c affected
3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6< ff040562c10a540b8d851f7f4145fa112977f853 affected
3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6< 6854476d9e1aeaaf05ebc98d610061c2075db07d affected
3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6< b7d08929178c16398278613df07ad65cf63cce9d affected
3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6< 5b7ae04969f822283a95c866967e42b4d75e0eef affected
3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6< 912c4b66bef713a20775cfbf3b5e9bd71525c716 affected
3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6< 26e84445f02ce6b2fe5f3e0e28ff7add77f35e08 affected
… +10 more rows
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I. Basic Information for CVE-2025-39864

Vulnerability Information
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Vulnerability Title
wifi: cfg80211: fix use-after-free in cmp_bss()
Source: CVE Program / CVE List V5
Vulnerability Description
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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于cfg80211_update_known_bss函数中未正确处理隐藏SSID网络，可能导致释放后重用。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 3ab8227d3e7d1d2bf1829675d3197e3cb600e9f6 ~ a8bb681e879ca3c9f722aa08d3d7ae41c42a8807 -
Linux Linux 5.4 -

II. Public POCs for CVE-2025-39864

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III. Intelligence Information for CVE-2025-39864

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Same Patch Batch · Linux · 2025-09-19 · 30 CVEs total

CVE-2025-39841 9.8 CRITICAL scsi: lpfc: Fix buffer free/clear order in deferred receive path
CVE-2025-39848 8.8 HIGH ax25: properly unshare skbs in ax25_kiss_rcv()
CVE-2025-39849 8.8 HIGH wifi: cfg80211: sme: cap SSID length in __cfg80211_connect_result()
CVE-2025-39862 8.8 HIGH wifi: mt76: mt7915: fix list corruption after hardware restart
CVE-2025-39839 8.8 HIGH batman-adv: fix OOB read/write in network-coding decode
CVE-2025-39860 8.0 HIGH Bluetooth: Fix use-after-free in l2cap_sock_cleanup_listen()
CVE-2025-39837 7.8 HIGH platform/x86: asus-wmi: Fix racy registrations
CVE-2025-39866 7.8 HIGH fs: writeback: fix use-after-free in __mark_inode_dirty()
CVE-2025-39854 7.8 HIGH ice: fix NULL access of tx->in_use in ice_ll_ts_intr
CVE-2025-39863 7.8 HIGH wifi: brcmfmac: fix use-after-free when rescheduling brcmf_btcoex_info work
CVE-2025-39857 7.5 HIGH net/smc: fix one NULL pointer dereference in smc_ib_is_sg_need_sync()
CVE-2025-39851 7.5 HIGH vxlan: Fix NPD when refreshing an FDB entry with a nexthop object
CVE-2025-39840 7.1 HIGH audit: fix out-of-bounds read in audit_compare_dname_path()
CVE-2025-39842 ocfs2: prevent release journal inode after journal shutdown
CVE-2025-39844 mm: move page table sync declarations to linux/pgtable.h
CVE-2025-39838 cifs: prevent NULL pointer dereference in UTF16 conversion
CVE-2025-39843 mm: slub: avoid wake up kswapd in set_track_prepare
CVE-2025-39852 net/tcp: Fix socket memory leak in TCP-AO failure handling for IPv6
CVE-2025-39845 x86/mm/64: define ARCH_PAGE_TABLE_SYNC_MASK and arch_sync_kernel_mappings()
CVE-2025-39846 pcmcia: Fix a NULL pointer dereference in __iodyn_find_io_region()

Showing top 20 of 30 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39864

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