# CVE-2024-49980: linux: In the Linux kernel, the following vulnerability has been resolved:  vrf: revert "vrf: Remove unnecessary RCU-bh crit...

CVE-2024-49980 is fixed in linux on 1 platform, first by DEBIAN-CVE-2024-49980, released October 21, 2024. It is not reported as exploited. Patch Radar priority: Routine.

- Web page: https://patchblox.com/security/cve/CVE-2024-49980
- Priority: Routine
- CVSS: 5.5 (medium)
- EPSS: 0.0018
- CISA KEV: not listed
- Exploited (vendor report): no
- Publicly disclosed: no
- Published: Oct 21, 2024

## Description

In the Linux kernel, the following vulnerability has been resolved:  vrf: revert "vrf: Remove unnecessary RCU-bh critical section"  This reverts commit 504fc6f4f7f681d2a03aa5f68aad549d90eab853.  dev_queue_xmit_nit is expected to be called with BH disabled. __dev_queue_xmit has the following:          /* Disable soft irqs for various locks below. Also          * stops preemption for RCU.          */         rcu_read_lock_bh();  VRF must follow this invariant. The referenced commit removed this protection. Which triggered a lockdep warning:  	================================ 	WARNING: inconsistent lock state 	6.11.0 #1 Tainted: G        W 	-------------------------------- 	inconsistent {IN-SOFTIRQ-W} -> {SOFTIRQ-ON-W} usage. 	btserver/134819 [HC0[0]:SC0[0]:HE1:SE1] takes: 	ffff8882da30c118 (rlock-AF_PACKET){+.?.}-{2:2}, at: tpacket_rcv+0x863/0x3b30 	{IN-SOFTIRQ-W} state was registered at: 	  lock_acquire+0x19a/0x4f0 	  _raw_spin_lock+0x27/0x40 	  packet_rcv+0xa33/0x1320 	  __netif_receive_skb_core.constprop.0+0xcb0/0x3a90 	  __netif_receive_skb_list_core+0x2c9/0x890 	  netif_receive_skb_list_internal+0x610/0xcc0           [...]  	other info that might help us debug this: 	 Possible unsafe locking scenario:  	       CPU0 	       ---- 	  lock(rlock-AF_PACKET); 	  <Interrupt> 	    lock(rlock-AF_PACKET);  	 *** DEADLOCK ***  	Call Trace: 	 <TASK> 	 dump_stack_lvl+0x73/0xa0 	 mark_lock+0x102e/0x16b0 	 __lock_acquire+0x9ae/0x6170 	 lock_acquire+0x19a/0x4f0 	 _raw_spin_lock+0x27/0x40 	 tpacket_rcv+0x863/0x3b30 	 dev_queue_xmit_nit+0x709/0xa40 	 vrf_finish_direct+0x26e/0x340 [vrf] 	 vrf_l3_out+0x5f4/0xe80 [vrf] 	 __ip_local_out+0x51e/0x7a0           [...]

## Where it's fixed

| Platform | Product | Fixed in | Fix | Released |
|---|---|---|---|---|
| Linux | linux Debian 13.5 (trixie) | 6.11.4-1 | [DEBIAN-CVE-2024-49980](https://patchblox.com/security/data/fix/linux/debian-cve-2024-49980.md) | Oct 21, 2024 |
| Linux | linux Debian 14 | 6.11.4-1 | [DEBIAN-CVE-2024-49980](https://patchblox.com/security/data/fix/linux/debian-cve-2024-49980.md) | Oct 21, 2024 |

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