CVE-2025-21801

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

net: ravb: Fix missing rtnl lock in suspend/resume path

Fix the suspend/resume path by ensuring the rtnl lock is held where required. Calls to ravbopen, ravbclose and wol operations must be performed under the rtnl lock to prevent conflicts with ongoing ndo operations.

Without this fix, the following warning is triggered: [ 39.032969] ============================= [ 39.032983] WARNING: suspicious RCU usage [ 39.033019] ----------------------------- [ 39.033033] drivers/net/phy/phydevice.c:2004 suspicious rcudereferenceprotected() usage! ... [ 39.033597] stack backtrace: [ 39.033613] CPU: 0 UID: 0 PID: 174 Comm: python3 Not tainted 6.13.0-rc7-next-20250116-arm64-renesas-00002-g35245dfdc62c #7 [ 39.033623] Hardware name: Renesas SMARC EVK version 2 based on r9a08g045s33 (DT) [ 39.033628] Call trace: [ 39.033633] showstack+0x14/0x1c (C) [ 39.033652] dumpstacklvl+0xb4/0xc4 [ 39.033664] dumpstack+0x14/0x1c [ 39.033671] lockdeprcususpicious+0x16c/0x22c [ 39.033682] phydetach+0x160/0x190 [ 39.033694] phydisconnect+0x40/0x54 [ 39.033703] ravbclose+0x6c/0x1cc [ 39.033714] ravbsuspend+0x48/0x120 [ 39.033721] dpmruncallback+0x4c/0x14c [ 39.033731] devicesuspend+0x11c/0x4dc [ 39.033740] dpmsuspend+0xdc/0x214 [ 39.033748] dpmsuspendstart+0x48/0x60 [ 39.033758] suspenddevicesandenter+0x124/0x574 [ 39.033769] pmsuspend+0x1ac/0x274 [ 39.033778] statestore+0x88/0x124 [ 39.033788] kobjattrstore+0x14/0x24 [ 39.033798] sysfskfwrite+0x48/0x6c [ 39.033808] kernfsfopwriteiter+0x118/0x1a8 [ 39.033817] vfswrite+0x27c/0x378 [ 39.033825] ksys_write+0x64/0xf4 [ 39.033833] _arm64syswrite+0x18/0x20 [ 39.033841] invokesyscall+0x44/0x104 [ 39.033852] el0svccommon.constprop.0+0xb4/0xd4 [ 39.033862] doel0svc+0x18/0x20 [ 39.033870] el0svc+0x3c/0xf0 [ 39.033880] el0t64synchandler+0xc0/0xc4 [ 39.033888] el0t64sync+0x154/0x158 [ 39.041274] ravb 11c30000.ethernet eth0: Link is Down