CVE-2024-49953

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

net/mlx5e: Fix crash caused by calling __xfrmstatedelete() twice

The km.state is not checked in driver's delayed work. When xfrmstatecheckexpire() is called, the state can be reset to XFRMSTATEEXPIRED, even if it is XFRMSTATE_DEAD already. This happens when xfrm state is deleted, but not freed yet. As __xfrmstatedelete() is called again in xfrm timer, the following crash occurs.

To fix this issue, skip xfrmstatecheckexpire() if km.state is not XFRMSTATE_VALID.

Oops: general protection fault, probably for non-canonical address 0xdead000000000108: 0000 [#1] SMP CPU: 5 UID: 0 PID: 7448 Comm: kworker/u102:2 Not tainted 6.11.0-rc2+ #1 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS rel-1.13.0-0-gf21b5a4aeb02-prebuilt.qemu.org 04/01/2014 Workqueue: mlx5eipsec: eth%d mlx5eipsechandleswlimits [mlx5core] RIP: 0010:__xfrmstatedelete+0x3d/0x1b0 Code: 0f 84 8b 01 00 00 48 89 fd c6 87 c8 00 00 00 05 48 8d bb 40 10 00 00 e8 11 04 1a 00 48 8b 95 b8 00 00 00 48 8b 85 c0 00 00 00 <48> 89 42 08 48 89 10 48 8b 55 10 48 b8 00 01 00 00 00 00 ad de 48 RSP: 0018:ffff88885f945ec8 EFLAGS: 00010246 RAX: dead000000000122 RBX: ffffffff82afa940 RCX: 0000000000000036 RDX: dead000000000100 RSI: 0000000000000000 RDI: ffffffff82afb980 RBP: ffff888109a20340 R08: ffff88885f945ea0 R09: 0000000000000000 R10: 0000000000000000 R11: ffff88885f945ff8 R12: 0000000000000246 R13: ffff888109a20340 R14: ffff88885f95f420 R15: ffff88885f95f400 FS: 0000000000000000(0000) GS:ffff88885f940000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 00007f2163102430 CR3: 00000001128d6001 CR4: 0000000000370eb0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <IRQ> ? dieaddr+0x33/0x90 ? excgeneralprotection+0x1a2/0x390 ? asmexcgeneralprotection+0x22/0x30 ? __xfrmstatedelete+0x3d/0x1b0 ? __xfrmstatedelete+0x2f/0x1b0 xfrmtimerhandler+0x174/0x350 ? __xfrmstatedelete+0x1b0/0x1b0 __hrtimerrunqueues+0x121/0x270 hrtimerrunsoftirq+0x88/0xd0 handlesoftirqs+0xcc/0x270 dosoftirq+0x3c/0x50 </IRQ> <TASK> _localbhenableip+0x47/0x50 mlx5eipsechandleswlimits+0x7d/0x90 [mlx5core] processonework+0x137/0x2d0 workerthread+0x28d/0x3a0 ? rescuerthread+0x480/0x480 kthread+0xb8/0xe0 ? kthreadpark+0x80/0x80 retfromfork+0x2d/0x50 ? kthreadpark+0x80/0x80 retfromforkasm+0x11/0x20 </TASK>