# CVE-2024-26896: linux: In the Linux kernel, the following vulnerability has been resolved:  wifi: wfx: fix memory leak when starting AP  Kme...

CVE-2024-26896 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-26896, released April 17, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-26896
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0023
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Apr 17, 2024

## Description

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.

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 6.1.85-1 | [DEBIAN-CVE-2024-26896](https://patchblox.com/security/data/fix/linux/debian-cve-2024-26896.md) | Apr 17, 2024 |
| Linux | linux Debian 13.5 (trixie) | 6.7.12-1 | [DEBIAN-CVE-2024-26896](https://patchblox.com/security/data/fix/linux/debian-cve-2024-26896.md) | Apr 17, 2024 |
| Linux | linux Debian 14 | 6.7.12-1 | [DEBIAN-CVE-2024-26896](https://patchblox.com/security/data/fix/linux/debian-cve-2024-26896.md) | Apr 17, 2024 |

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