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🛡️ CVE-2024-49980 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

vrf: revert "vrf: Remove unnecessary RCU-bh critical section"

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

[...]

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality none, integrity none, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: None.
  • Integrity impact: None.
  • Availability impact: High — total loss, or loss the attacker controls.

Affected software

CVE-2024-49980 is recorded against 2 packages.

  • kernel (from 6.11.0 up to 6.11.3)
  • linux-kernel

Timeline and source

Published on 21 October 2024 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

Other advisories for this package

kernel has other advisories on record. If you are patching this one, these are worth checking on the same host:

CVE-2024-49980 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2024-10-21
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.11.0 6.11.3
linux-kernel — —

Similar Threats

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