CVE-2024-53042: ipv4: ip_tunnel: Fix suspicious RCU usage warning in ip_tunnel_init_flow()
First published: Tue Nov 19 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: ipv4: ip_tunnel: Fix suspicious RCU usage warning in ip_tunnel_init_flow() There are code paths from which the function is called without holding the RCU read lock, resulting in a suspicious RCU usage warning [1]. Fix by using l3mdev_master_upper_ifindex_by_index() which will acquire the RCU read lock before calling l3mdev_master_upper_ifindex_by_index_rcu(). [1] WARNING: suspicious RCU usage 6.12.0-rc3-custom-gac8f72681cf2 #141 Not tainted ----------------------------- net/core/dev.c:876 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/361: #0: ffffffff86fc7cb0 (rtnl_mutex){+.+.}-{3:3}, at: rtnetlink_rcv_msg+0x377/0xf60 stack backtrace: CPU: 3 UID: 0 PID: 361 Comm: ip Not tainted 6.12.0-rc3-custom-gac8f72681cf2 #141 Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 Call Trace: <TASK> dump_stack_lvl+0xba/0x110 lockdep_rcu_suspicious.cold+0x4f/0xd6 dev_get_by_index_rcu+0x1d3/0x210 l3mdev_master_upper_ifindex_by_index_rcu+0x2b/0xf0 ip_tunnel_bind_dev+0x72f/0xa00 ip_tunnel_newlink+0x368/0x7a0 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
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=5.10.227<5.10.229 | |
| Linux Kernel | >=5.15.168<5.15.171 | |
| Linux Kernel | >=5.18<6.1.116 | |
| Linux Kernel | >=6.2<6.6.60 | |
| Linux Kernel | >=6.7<6.11.7 | |
| Linux Kernel | =6.12-rc1 | |
| Linux Kernel | =6.12-rc2 | |
| Linux Kernel | =6.12-rc3 | |
| Linux Kernel | =6.12-rc4 | |
| Linux Kernel | =6.12-rc5 | |
| debian/linux | <=5.10.223-1<=5.10.226-1 | 6.1.123-1 6.1.128-1 6.12.12-1 6.12.15-1 |
| debian/linux-6.1 | 6.1.119-1~deb11u1 |
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Reference Links
- https://git.kernel.org/stable/c/e2742758c9c85c84e077ede5f916479f724e11c2
- https://git.kernel.org/stable/c/5edcb3fdb12c3d46a6e79eeeec27d925b80fc168
- https://git.kernel.org/stable/c/72c0f482e39c87317ebf67661e28c8d86c93e870
- https://git.kernel.org/stable/c/699b48fc31727792edf2cab3829586ae6ba649e2
- https://git.kernel.org/stable/c/6dfaa458fe923211c766238a224e0a3c0522935c
- https://git.kernel.org/stable/c/ad4a3ca6a8e886f6491910a3ae5d53595e40597d
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-53042
- https://nvd.nist.gov/vuln/detail/CVE-2024-53042
- https://launchpad.net/bugs/cve/CVE-2024-53042
- https://security-tracker.debian.org/tracker/CVE-2024-53042
- https://ubuntu.com/security/CVE-2024-53042
- https://git.kernel.org/linus/ad4a3ca6a8e886f6491910a3ae5d53595e40597d
Frequently Asked Questions
What is the severity of CVE-2024-53042?
CVE-2024-53042 is classified as a low-severity vulnerability due to the non-exploitability of the RCU usage warning.
How do I fix CVE-2024-53042?
To mitigate CVE-2024-53042, users should upgrade to the latest patched version of the Linux kernel.
What systems are affected by CVE-2024-53042?
CVE-2024-53042 affects specific versions of the Linux kernel ranging from 5.10.227 to 5.10.229, 5.15.168 to 5.15.171, 5.18 to 6.1.116, and also several versions up to 6.12-rc5.
What is the impact of CVE-2024-53042 on Linux systems?
The impact of CVE-2024-53042 is primarily related to performance warnings, with no direct threat to system security.
Is there a workaround for CVE-2024-53042?
There are no specific workarounds for CVE-2024-53042; the recommended action is to update the kernel.
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