CVE-2024-26896

In the Linux kernel, the following vulnerability has been resolved:

wifi: wfx: fix memory leak when starting AP

Kmemleak reported this error:

unreferenced object 0xd73d1180 (size 184):
  comm "wpa_supplicant", pid 1559, jiffies 13006305 (age 964.245s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    00 00 00 00 00 00 00 00 1e 00 01 00 00 00 00 00  ................
  backtrace:
    [<5ca11420>] kmem_cache_alloc+0x20c/0x5ac
    [<127bdd74>] __alloc_skb+0x144/0x170
    [<fb8a5e38>] __netdev_alloc_skb+0x50/0x180
    [<0f9fa1d5>] __ieee80211_beacon_get+0x290/0x4d4 [mac80211]
    [<7accd02d>] ieee80211_beacon_get_tim+0x54/0x18c [mac80211]
    [<41e25cc3>] wfx_start_ap+0xc8/0x234 [wfx]
    [<93a70356>] ieee80211_start_ap+0x404/0x6b4 [mac80211]
    [<a4a661cd>] nl80211_start_ap+0x76c/0x9e0 [cfg80211]
    [<47bd8b68>] genl_rcv_msg+0x198/0x378
    [<453ef796>] netlink_rcv_skb+0xd0/0x130
    [<6b7c977a>] genl_rcv+0x34/0x44
    [<66b2d04d>] netlink_unicast+0x1b4/0x258
    [<f965b9b6>] netlink_sendmsg+0x1e8/0x428
    [<aadb8231>] ____sys_sendmsg+0x1e0/0x274
    [<d2b5212d>] ___sys_sendmsg+0x80/0xb4
    [<69954f45>] __sys_sendmsg+0x64/0xa8
unreferenced object 0xce087000 (size 1024):
  comm "wpa_supplicant", pid 1559, jiffies 13006305 (age 964.246s)
  hex dump (first 32 bytes):
    00 00 00 00 00 00 00 00 00 00 00 00 00 00 00 00  ................
    10 00 07 40 00 00 00 00 00 00 00 00 00 00 00 00  ...@............
  backtrace:
    [<9a993714>] __kmalloc_track_caller+0x230/0x600
    [<f83ea192>] kmalloc_reserve.constprop.0+0x30/0x74
    [<a2c61343>] __alloc_skb+0xa0/0x170
    [<fb8a5e38>] __netdev_alloc_skb+0x50/0x180
    [<0f9fa1d5>] __ieee80211_beacon_get+0x290/0x4d4 [mac80211]
    [<7accd02d>] ieee80211_beacon_get_tim+0x54/0x18c [mac80211]
    [<41e25cc3>] wfx_start_ap+0xc8/0x234 [wfx]
    [<93a70356>] ieee80211_start_ap+0x404/0x6b4 [mac80211]
    [<a4a661cd>] nl80211_start_ap+0x76c/0x9e0 [cfg80211]
    [<47bd8b68>] genl_rcv_msg+0x198/0x378
    [<453ef796>] netlink_rcv_skb+0xd0/0x130
    [<6b7c977a>] genl_rcv+0x34/0x44
    [<66b2d04d>] netlink_unicast+0x1b4/0x258
    [<f965b9b6>] netlink_sendmsg+0x1e8/0x428
    [<aadb8231>] ____sys_sendmsg+0x1e0/0x274
    [<d2b5212d>] ___sys_sendmsg+0x80/0xb4

However, since the kernel is build optimized, it seems the stack is not accurate. It appears the issue is related to wfx_set_mfp_ap(). The issue is obvious in this function: memory allocated by ieee80211_beacon_get() is never released. Fixing this leak makes kmemleak happy.

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.