🛡️ AZL-53441 — kernel

⚪ Unknown ✅ No Known Exploit OSV
N/A
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

CVE-2024-50304 affecting package kernel for versions less than 6.6.76.1-1

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

ipv4: ip_tunnel: Fix suspicious RCU usage warning in ip_tunnel_find()

The per-netns IP tunnel hash table is protected by the RTNL mutex and

ip_tunnel_find() is only called from the control path where the mutex is

taken.

Add a lockdep expression to hlist_for_each_entry_rcu() in

ip_tunnel_find() in order to validate that the mutex is held and to

silence the suspicious RCU usage warning [1].

[1]

WARNING: suspicious RCU usage

6.12.0-rc3-custom-gd95d9a31aceb #139 Not tainted

-----------------------------

net/ipv4/ip_tunnel.c:221 RCU-list traversed in non-reader section!!

other info that might help us debug this:

rcu_scheduler_active = 2, debug_locks = 1

1 lock held by ip/362:

#0: ffffffff86fc7cb0 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x377/0xf60

stack backtrace:

CPU: 12 UID: 0 PID: 362 Comm: ip Not tainted 6.12.0-rc3-custom-gd95d9a31aceb #139

Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011

Call Trace:

<TASK>

dump_stack_lvl+0xba/0x110

lockdep_rcu_suspicious.cold+0x4f/0xd6

ip_tunnel_find+0x435/0x4d0

ip_tunnel_newlink+0x517/0x7a0

ipgre_newlink+0x14c/0x170

__rtnl_newlink+0x1173/0x19c0

rtnl_newlink+0x6c/0xa0

rtnetlink_rcv_msg+0x3cc/0xf60

netlink_rcv_skb+0x171/0x450

netlink_unicast+0x539/0x7f0

netlink_sendmsg+0x8c1/0xd80

____sys_sendmsg+0x8f9/0xc20

___sys_sendmsg+0x197/0x1e0

__sys_sendmsg+0x122/0x1f0

do_syscall_64+0xbb/0x1d0

entry_SYSCALL_64_after_hwframe+0x77/0x7f

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.

Affected software

AZL-53441 is recorded against 1 package.

  • kernel (fixed in 6.6.76.1-1)

Timeline and source

Published on 19 November 2024 and last revised on 21 April 2026. No public exploit is currently recorded for this entry. Record sourced from OSV.

References

nvd.nist.gov (Web)

Details

Severity Unknown
CVSS Score N/A
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 OSV
Published 2024-11-19
Updated 2026-08-12
Modified 2026-04-21
Fix URL N/A

Affected Packages

Software From version Fixed in
kernel — 6.6.76.1-1

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