CVE-2024-49980: vrf: revert "vrf: Remove unnecessary RCU-bh critical section"
First published: Mon Oct 21 2024(Updated: )
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 [...]
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux kernel | >=6.6<6.6.55 | |
| Linux kernel | >=6.7<6.10.14 | |
| Linux kernel | >=6.11<6.11.3 | |
| Linux kernel | =6.12-rc1 | |
| Linux Kernel | >=6.6<6.6.55 | |
| Linux Kernel | >=6.7<6.10.14 | |
| Linux Kernel | >=6.11<6.11.3 | |
| Linux Kernel | =6.12-rc1 | |
| debian/linux | 5.10.223-1 5.10.234-1 6.1.129-1 6.1.128-1 6.12.20-1 6.12.21-1 |
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Reference Links
- https://git.kernel.org/stable/c/718a752bd746b3f4dd62516bb437baf73d548415
- https://git.kernel.org/stable/c/8c9381b3138246d46536db93ed696832abd70204
- https://git.kernel.org/stable/c/e61f8c4d179b2ffc0d3b7f821c3734be738643d0
- https://git.kernel.org/stable/c/b04c4d9eb4f25b950b33218e33b04c94e7445e51
- https://launchpad.net/bugs/cve/CVE-2024-49980
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-49980
- https://nvd.nist.gov/vuln/detail/CVE-2024-49980
- https://security-tracker.debian.org/tracker/CVE-2024-49980
- https://ubuntu.com/security/CVE-2024-49980
- https://git.kernel.org/linus/b04c4d9eb4f25b950b33218e33b04c94e7445e51
Frequently Asked Questions
What is the severity of CVE-2024-49980?
CVE-2024-49980 has a medium severity level due to potential impact on the Linux kernel's network functionality.
How do I fix CVE-2024-49980?
To fix CVE-2024-49980, update the Linux kernel to versions beyond 6.6.55, 6.10.14, 6.11.3, or 6.12-rc1 to include the necessary patches.
What systems are affected by CVE-2024-49980?
CVE-2024-49980 affects specific versions of the Linux kernel including versions 6.6 to 6.6.55, 6.7 to 6.10.14, and 6.11 to 6.11.3.
What are the symptoms of CVE-2024-49980 exploitation?
Symptoms of CVE-2024-49980 exploitation may include unexpected network behavior or performance degradation in systems running the affected kernel versions.
Is there a workaround for CVE-2024-49980?
There are no specific workarounds recommended for CVE-2024-49980; timely kernel updates are advised as the primary mitigation.
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