CVE-2026-23073

Description

In the Linux kernel, the following vulnerability has been resolved:wifi: rsi: Fix memory corruption due to not set vif driver data sizeThe struct ieee80211_vif contains trailing space for vif driver data,when struct ieee80211_vif is allocated, the total memory size that isallocated is sizeof(struct ieee80211_vif) + size of vif driver data.The size of vif driver data is set by each WiFi driver as needed.The RSI911x driver does not set vif driver data size, no trailing spacefor vif driver data is therefore allocated past struct ieee80211_vif .The RSI911x driver does however use the vif driver data to store itsvif driver data structure struct vif_priv. An access to vif->drv_privleads to access out of struct ieee80211_vif bounds and corruption ofsome memory.In case of the failure observed locally, rsi_mac80211_add_interface()would write struct vif_priv *vif_info = (struct vif_priv *)vif->drv_priv;vif_info->vap_id = vap_idx. This write corrupts struct fq_tin memberstruct list_head new_flows . The flow = list_first_entry(head, structfq_flow, flowchain); in fq_tin_reset() then reports non-null bogusaddress, which when accessed causes a crash.The trigger is very simple, boot the machine with init=/bin/sh , mountdevtmpfs, sysfs, procfs, and then do ip link set wlan0 up, sleep 1,ip link set wlan0 down and the crash occurs.Fix this by setting the correct size of vif driver data, which is thesize of struct vif_priv, so that memory is allocated and the drivercan store its driver data in it, instead of corrupting memory aroundit.

Risk Information

Associated Vulnerability

Patch Details

References

https://nvd.nist.gov/vuln/detail/CVE-2023-1234
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2023-1234