CVE-2021-47029: linux kernel — Fix

Description

In the Linux kernel, the following vulnerability has been resolved: mt76: connac: fix kernel warning adding monitor interface Fix the following kernel warning adding a monitor interface in mt76_connac_mcu_uni_add_dev routine. [ 507.984882] ------------[ cut here ]------------ [ 507.989515] WARNING: CPU: 1 PID: 3017 at mt76_connac_mcu_uni_add_dev+0x178/0x190 [mt76_connac_lib] [ 508.059379] CPU: 1 PID: 3017 Comm: ifconfig Not tainted 5.4.98 #0 [ 508.065461] Hardware name: MT7622_MT7531 RFB (DT) [ 508.070156] pstate: 80000005 (Nzcv daif -PAN -UAO) [ 508.074939] pc : mt76_connac_mcu_uni_add_dev+0x178/0x190 [mt76_connac_lib] [ 508.081806] lr : mt7921_eeprom_init+0x1288/0x1cb8 [mt7921e] [ 508.087367] sp : ffffffc013a33930 [ 508.090671] x29: ffffffc013a33930 x28: ffffff801e628ac0 [ 508.095973] x27: ffffff801c7f1200 x26: ffffff801c7eb008 [ 508.101275] x25: ffffff801c7eaef0 x24: ffffff801d025610 [ 508.106577] x23: ffffff801d022990 x22: ffffff801d024de8 [ 508.111879] x21: ffffff801d0226a0 x20: ffffff801c7eaee8 [ 508.117181] x19: ffffff801d0226a0 x18: 000000005d00b000 [ 508.122482] x17: 00000000ffffffff x16: 0000000000000000 [ 508.127785] x15: 0000000000000080 x14: ffffff801d704000 [ 508.133087] x13: 0000000000000040 x12: 0000000000000002 [ 508.138389] x11: 000000000000000c x10: 0000000000000000 [ 508.143691] x9 : 0000000000000020 x8 : 0000000000000001 [ 508.148992] x7 : 0000000000000000 x6 : 0000000000000000 [ 508.154294] x5 : ffffff801c7eaee8 x4 : 0000000000000006 [ 508.159596] x3 : 0000000000000001 x2 : 0000000000000000 [ 508.164898] x1 : ffffff801c7eac08 x0 : ffffff801d0226a0 [ 508.170200] Call trace: [ 508.172640] mt76_connac_mcu_uni_add_dev+0x178/0x190 [mt76_connac_lib] [ 508.179159] mt7921_eeprom_init+0x1288/0x1cb8 [mt7921e] [ 508.184394] drv_add_interface+0x34/0x88 [mac80211] [ 508.189271] ieee80211_add_virtual_monitor+0xe0/0xb48 [mac80211] [ 508.195277] ieee80211_do_open+0x86c/0x918 [mac80211] [ 508.200328] ieee80211_do_open+0x900/0x918 [mac80211] [ 508.205372] __dev_open+0xcc/0x150 [ 508.208763] __dev_change_flags+0x134/0x198 [ 508.212937] dev_change_flags+0x20/0x60 [ 508.216764] devinet_ioctl+0x3e8/0x748 [ 508.220503] inet_ioctl+0x1e4/0x350 [ 508.223983] sock_do_ioctl+0x48/0x2a0 [ 508.227635] sock_ioctl+0x310/0x4f8 [ 508.231116] do_vfs_ioctl+0xa4/0xac0 [ 508.234681] ksys_ioctl+0x44/0x90 [ 508.237985] __arm64_sys_ioctl+0x1c/0x48 [ 508.241901] el0_svc_common.constprop.1+0x7c/0x100 [ 508.246681] el0_svc_handler+0x18/0x20 [ 508.250421] el0_svc+0x8/0x1c8 [ 508.253465] ---[ end trace c7b90fee13d72c39 ]--- [ 508.261278] ------------[ cut here ]------------

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CVSS v3.1 Score

5.5

MEDIUM

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Affected Products

Vendor	Product	Versions
linux	linux_kernel	5.12 — 5.12.4

References

Advisories & Patches

https://git.kernel.org/stable/c/2554b9cb4b5e097c6071ec3ed5bc7c665c477ca7 https://git.kernel.org/stable/c/c996f0346e40e3b1ac2ebaf0681df898fb157f60 https://git.kernel.org/stable/c/2554b9cb4b5e097c6071ec3ed5bc7c665c477ca7 https://git.kernel.org/stable/c/c996f0346e40e3b1ac2ebaf0681df898fb157f60

Frequently Asked Questions

What is CVE-2021-47029? +

In the Linux kernel, the following vulnerability has been resolved: mt76: connac: fix kernel warning adding monitor interface Fix the following kernel warning adding a monitor interface in mt76_connac_mcu_uni_add_dev routine. [ 507.984882] ------------[ cut here ]------------ [ 507.989515] WARNING: CPU: 1 PID: 3017 at mt76_connac_mcu_uni_add_dev+0x178/0x190 [mt76_connac_lib] [ 508.059379] CPU: 1 PID: 3017 Comm: ifconfig Not tainted 5.4.98 #0 [ 508.065461] Hardware name: MT7622_MT7531 RFB (DT) [ 508.070156] pstate: 80000005 (Nzcv daif -PAN -UAO) [ 508.074939] pc : mt76_connac_mcu_uni_add_dev+0x178/0x190 [mt76_connac_lib] [ 508.081806] lr : mt7921_eeprom_init+0x1288/0x1cb8 [mt7921e] [ 508.087367] sp : ffffffc013a33930 [ 508.090671] x29: ffffffc013a33930 x28: ffffff801e628ac0 [ 508.095973] x27: ffffff801c7f1200 x26: ffffff801c7eb008 [ 508.101275] x25: ffffff801c7eaef0 x24: ffffff801d025610 [ 508.106577] x23: ffffff801d022990 x22: ffffff801d024de8 [ 508.111879] x21: ffffff801d0226a0 x20: ffffff801c7eaee8 [ 508.117181] x19: ffffff801d0226a0 x18: 000000005d00b000 [ 508.122482] x17: 00000000ffffffff x16: 0000000000000000 [ 508.127785] x15: 0000000000000080 x14: ffffff801d704000 [ 508.133087] x13: 0000000000000040 x12: 0000000000000002 [ 508.138389] x11: 000000000000000c x10: 0000000000000000 [ 508.143691] x9 : 0000000000000020 x8 : 0000000000000001 [ 508.148992] x7 : 0000000000000000 x6 : 0000000000000000 [ 508.154294] x5 : ffffff801c7eaee8 x4 : 0000000000000006 [ 508.159596] x3 : 0000000000000001 x2 : 0000000000000000 [ 508.164898] x1 : ffffff801c7eac08 x0 : ffffff801d0226a0 [ 508.170200] Call trace: [ 508.172640] mt76_connac_mcu_uni_add_dev+0x178/0x190 [mt76_connac_lib] [ 508.179159] mt7921_eeprom_init+0x1288/0x1cb8 [mt7921e] [ 508.184394] drv_add_interface+0x34/0x88 [mac80211] [ 508.189271] ieee80211_add_virtual_monitor+0xe0/0xb48 [mac80211] [ 508.195277] ieee80211_do_open+0x86c/0x918 [mac80211] [ 508.200328] ieee80211_do_open+0x900/0x918 [mac80211] [ 508.205372] __dev_open+0xcc/0x150 [ 508.208763] __dev_change_flags+0x134/0x198 [ 508.212937] dev_change_flags+0x20/0x60 [ 508.216764] devinet_ioctl+0x3e8/0x748 [ 508.220503] inet_ioctl+0x1e4/0x350 [ 508.223983] sock_do_ioctl+0x48/0x2a0 [ 508.227635] sock_ioctl+0x310/0x4f8 [ 508.231116] do_vfs_ioctl+0xa4/0xac0 [ 508.234681] ksys_ioctl+0x44/0x90 [ 508.237985] __arm64_sys_ioctl+0x1c/0x48 [ 508.241901] el0_svc_common.constprop.1+0x7c/0x100 [ 508.246681] el0_svc_handler+0x18/0x20 [ 508.250421] el0_svc+0x8/0x1c8 [ 508.253465] ---[ end trace c7b90fee13d72c39 ]--- [ 508.261278] ------------[ cut here ]------------ It has a CVSS v3.1 base score of 5.5 (MEDIUM).

How severe is CVE-2021-47029? +

CVE-2021-47029 has a CVSS v3.1 score of 5.5 out of 10, rated MEDIUM. This is a medium-severity vulnerability that should be remediated as part of regular maintenance.

What products are affected by CVE-2021-47029? +

CVE-2021-47029 affects products from linux, specifically: linux_kernel. Check the affected products table above for specific version ranges.

How do I check if I'm vulnerable to CVE-2021-47029? +

You can use Secably's free Website Scanner to check your website for known vulnerabilities. For infrastructure scanning, use the Port Scanner to identify exposed services that may be affected. Check the vendor advisories linked above for specific patch and version information.

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CVE-2021-47029