CVE-2026-23368 in Linux
Sumário
de VulDB • 22/06/2026
No kernel do Linux, a seguinte vulnerabilidade foi resolvida:
net: phy: registrar os led_triggers da phy durante o probe para evitar um deadlock AB-BA
Existe um deadlock AB-BA quando tanto LEDS_TRIGGER_NETDEV quanto LED_TRIGGER_PHY estão habilitados:
[ 1362.049207] [<8054e4b8>] led_trigger_register+0x5c/0x1fc <-- Tentando obter o lock "triggers_list_lock" via down_write(&triggers_list_lock);
[ 1362.054536] [<80662830>] phy_led_triggers_register+0xd0/0x234
[ 1362.060329] [<8065e200>] phy_attach_direct+0x33c/0x40c
[ 1362.065489] [<80651fc4>] phylink_fwnode_phy_connect+0x15c/0x23c
[ 1362.071480] [<8066ee18>] mtk_open+0x7c/0xba0
[ 1362.075849] [<806d714c>] __dev_open+0x280/0x2b0
[ 1362.080384] [<806d7668>] __dev_change_flags+0x244/0x24c
[ 1362.085598] [<806d7698>] dev_change_flags+0x28/0x78
[ 1362.090528] [<807150e4>] dev_ioctl+0x4c0/0x654 <-- Mantendo o lock "rtnl_mutex" chamando rtnl_lock();
[ 1362.094985] [<80694360>] sock_ioctl+0x2f4/0x4e0
[ 1362.099567] [<802e9c4c>] sys_ioctl+0x32c/0xd8c
[ 1362.104022] [<80014504>] syscall_common+0x34/0x58
Aqui, LED_TRIGGER_PHY está registrando os led_triggers durante o phy_attach enquanto mantém RTNL e depois obtendo triggers_list_lock.
[ 1362.191101] [<806c264
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