# CVE-2021-47540: linux: In the Linux kernel, the following vulnerability has been resolved:  mt76: mt7915: fix NULL pointer dereference in mt...

CVE-2021-47540 is fixed in linux on 1 platform, first by DEBIAN-CVE-2021-47540, released May 24, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2021-47540
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0024
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: May 24, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  mt76: mt7915: fix NULL pointer dereference in mt7915_get_phy_mode  Fix the following NULL pointer dereference in mt7915_get_phy_mode routine adding an ibss interface to the mt7915 driver.  [  101.137097] wlan0: Trigger new scan to find an IBSS to join [  102.827039] wlan0: Creating new IBSS network, BSSID 26:a4:50:1a:6e:69 [  103.064756] Unable to handle kernel NULL pointer dereference at virtual address 0000000000000000 [  103.073670] Mem abort info: [  103.076520]   ESR = 0x96000005 [  103.079614]   EC = 0x25: DABT (current EL), IL = 32 bits [  103.084934]   SET = 0, FnV = 0 [  103.088042]   EA = 0, S1PTW = 0 [  103.091215] Data abort info: [  103.094104]   ISV = 0, ISS = 0x00000005 [  103.098041]   CM = 0, WnR = 0 [  103.101044] user pgtable: 4k pages, 39-bit VAs, pgdp=00000000460b1000 [  103.107565] [0000000000000000] pgd=0000000000000000, p4d=0000000000000000, pud=0000000000000000 [  103.116590] Internal error: Oops: 96000005 [#1] SMP [  103.189066] CPU: 1 PID: 333 Comm: kworker/u4:3 Not tainted 5.10.75 #0 [  103.195498] Hardware name: MediaTek MT7622 RFB1 board (DT) [  103.201124] Workqueue: phy0 ieee80211_iface_work [mac80211] [  103.206695] pstate: 20000005 (nzCv daif -PAN -UAO -TCO BTYPE=--) [  103.212705] pc : mt7915_get_phy_mode+0x68/0x120 [mt7915e] [  103.218103] lr : mt7915_mcu_add_bss_info+0x11c/0x760 [mt7915e] [  103.223927] sp : ffffffc011cdb9e0 [  103.227235] x29: ffffffc011cdb9e0 x28: ffffff8006563098 [  103.232545] x27: ffffff8005f4da22 x26: ffffff800685ac40 [  103.237855] x25: 0000000000000001 x24: 000000000000011f [  103.243165] x23: ffffff8005f4e260 x22: ffffff8006567918 [  103.248475] x21: ffffff8005f4df80 x20: ffffff800685ac58 [  103.253785] x19: ffffff8006744400 x18: 0000000000000000 [  103.259094] x17: 0000000000000000 x16: 0000000000000001 [  103.264403] x15: 000899c3a2d9d2e4 x14: 000899bdc3c3a1c8 [  103.269713] x13: 0000000000000000 x12: 0000000000000000 [  103.275024] x11: ffffffc010e30c20 x10: 0000000000000000 [  103.280333] x9 : 0000000000000050 x8 : ffffff8006567d88 [  103.285642] x7 : ffffff8006563b5c x6 : ffffff8006563b44 [  103.290952] x5 : 0000000000000002 x4 : 0000000000000001 [  103.296262] x3 : 0000000000000001 x2 : 0000000000000001 [  103.301572] x1 : 0000000000000000 x0 : 0000000000000011 [  103.306882] Call trace: [  103.309328]  mt7915_get_phy_mode+0x68/0x120 [mt7915e] [  103.314378]  mt7915_bss_info_changed+0x198/0x200 [mt7915e] [  103.319941]  ieee80211_bss_info_change_notify+0x128/0x290 [mac80211] [  103.326360]  __ieee80211_sta_join_ibss+0x308/0x6c4 [mac80211] [  103.332171]  ieee80211_sta_create_ibss+0x8c/0x10c [mac80211] [  103.337895]  ieee80211_ibss_work+0x3dc/0x614 [mac80211] [  103.343185]  ieee80211_iface_work+0x388/0x3f0 [mac80211] [  103.348495]  process_one_work+0x288/0x690 [  103.352499]  worker_thread+0x70/0x464 [  103.356157]  kthread+0x144/0x150 [  103.359380]  ret_from_fork+0x10/0x18 [  103.362952] Code: 394008c3 52800220 394000e4 7100007f (39400023)

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 12.15 (bookworm) | 5.15.15-1 | [DEBIAN-CVE-2021-47540](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47540.md) | May 24, 2024 |
| Linux | linux Debian 13.5 (trixie) | 5.15.15-1 | [DEBIAN-CVE-2021-47540](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47540.md) | May 24, 2024 |
| Linux | linux Debian 14 | 5.15.15-1 | [DEBIAN-CVE-2021-47540](https://patchblox.com/security/data/fix/linux/debian-cve-2021-47540.md) | May 24, 2024 |

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