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CVE-2026-31394— mac80211: fix crash in ieee80211_chan_bw_change for AP_VLAN stations

EPSS 0.03% · P7
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I. Basic Information for CVE-2026-31394

Vulnerability Information
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Vulnerability Title
mac80211: fix crash in ieee80211_chan_bw_change for AP_VLAN stations
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: mac80211: fix crash in ieee80211_chan_bw_change for AP_VLAN stations ieee80211_chan_bw_change() iterates all stations and accesses link->reserved.oper via sta->sdata->link[link_id]. For stations on AP_VLAN interfaces (e.g. 4addr WDS clients), sta->sdata points to the VLAN sdata, whose link never participates in chanctx reservations. This leaves link->reserved.oper zero-initialized with chan == NULL, causing a NULL pointer dereference in __ieee80211_sta_cap_rx_bw() when accessing chandef->chan->band during CSA. Resolve the VLAN sdata to its parent AP sdata using get_bss_sdata() before accessing link data. [also change sta->sdata in ARRAY_SIZE even if it doesn't matter]
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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，该漏洞源于访问AP_VLAN站点的链接数据时未解析父接口，可能导致空指针取消引用。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux b27512368591fc959768df1f7dacf2a96b1bd036 ~ 65c25b588994dd422fea73fa322de56e1ae4a33b -
LinuxLinux 6.11 -

II. Public POCs for CVE-2026-31394

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III. Intelligence Information for CVE-2026-31394

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Same Patch Batch · Linux · 2026-04-03 · 72 CVEs total

CVE-2026-234509.8 CRITICALnet/smc: fix NULL dereference and UAF in smc_tcp_syn_recv_sock()
CVE-2026-314029.8 CRITICALnfsd: fix heap overflow in NFSv4.0 LOCK replay cache
CVE-2026-234279.8 CRITICALksmbd: fix use-after-free in durable v2 replay of active file handles
CVE-2026-234289.8 CRITICALksmbd: fix use-after-free of share_conf in compound request
CVE-2026-234559.1 CRITICALnetfilter: nf_conntrack_h323: check for zero length in DecodeQ931()
CVE-2026-234618.8 HIGHBluetooth: L2CAP: Fix use-after-free in l2cap_unregister_user
CVE-2026-234628.8 HIGHBluetooth: HIDP: Fix possible UAF
CVE-2026-234258.8 HIGHKVM: arm64: Fix ID register initialization for non-protected pKVM guests
CVE-2026-234578.6 HIGHnetfilter: nf_conntrack_sip: fix Content-Length u32 truncation in sip_help_tcp()
CVE-2026-234568.2 HIGHnetfilter: nf_conntrack_h323: fix OOB read in decode_int() CONS case
CVE-2026-234598.2 HIGHip_tunnel: adapt iptunnel_xmit_stats() to NETDEV_PCPU_STAT_DSTATS
CVE-2026-313938.1 HIGHBluetooth: L2CAP: Validate L2CAP_INFO_RSP payload length before access
CVE-2026-313928.1 HIGHsmb: client: fix krb5 mount with username option
CVE-2026-314037.8 HIGHNFSD: Hold net reference for the lifetime of /proc/fs/nfs/exports fd
CVE-2026-313897.8 HIGHspi: fix use-after-free on controller registration failure
CVE-2026-234377.8 HIGHnet: shaper: protect late read accesses to the hierarchy
CVE-2026-234587.8 HIGHnetfilter: ctnetlink: fix use-after-free in ctnetlink_dump_exp_ct()
CVE-2026-234447.8 HIGHwifi: mac80211: always free skb on ieee80211_tx_prepare_skb() failure
CVE-2026-234457.8 HIGHigc: fix page fault in XDP TX timestamps handling
CVE-2026-234497.8 HIGHnet/sched: teql: Fix double-free in teql_master_xmit

Showing top 20 of 72 CVEs. View all on vendor page → →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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