CVE-2024-53047: mptcp: init: protect sched with rcu_read_lock
First published: Tue Nov 19 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: mptcp: init: protect sched with rcu_read_lock Enabling CONFIG_PROVE_RCU_LIST with its dependence CONFIG_RCU_EXPERT creates this splat when an MPTCP socket is created: ============================= WARNING: suspicious RCU usage 6.12.0-rc2+ #11 Not tainted ----------------------------- net/mptcp/sched.c:44 RCU-list traversed in non-reader section!! other info that might help us debug this: rcu_scheduler_active = 2, debug_locks = 1 no locks held by mptcp_connect/176. stack backtrace: CPU: 0 UID: 0 PID: 176 Comm: mptcp_connect Not tainted 6.12.0-rc2+ #11 Hardware name: Bochs Bochs, BIOS Bochs 01/01/2011 Call Trace: <TASK> dump_stack_lvl (lib/dump_stack.c:123) lockdep_rcu_suspicious (kernel/locking/lockdep.c:6822) mptcp_sched_find (net/mptcp/sched.c:44 (discriminator 7)) mptcp_init_sock (net/mptcp/protocol.c:2867 (discriminator 1)) ? sock_init_data_uid (arch/x86/include/asm/atomic.h:28) inet_create.part.0.constprop.0 (net/ipv4/af_inet.c:386) ? __sock_create (include/linux/rcupdate.h:347 (discriminator 1)) __sock_create (net/socket.c:1576) __sys_socket (net/socket.c:1671) ? __pfx___sys_socket (net/socket.c:1712) ? do_user_addr_fault (arch/x86/mm/fault.c:1419 (discriminator 1)) __x64_sys_socket (net/socket.c:1728) do_syscall_64 (arch/x86/entry/common.c:52 (discriminator 1)) entry_SYSCALL_64_after_hwframe (arch/x86/entry/entry_64.S:130) That's because when the socket is initialised, rcu_read_lock() is not used despite the explicit comment written above the declaration of mptcp_sched_find() in sched.c. Adding the missing lock/unlock avoids the warning.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | >=6.6<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 5.10.234-1 6.1.129-1 6.1.133-1 6.12.21-1 6.12.22-1 |
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Reference Links
- https://git.kernel.org/stable/c/cb8b81ad3e893a6d18dcdd3754cc2ea2a42c0136
- https://git.kernel.org/stable/c/494eb22f9a7bd03783e60595a57611c209175f1a
- https://git.kernel.org/stable/c/3deb12c788c385e17142ce6ec50f769852fcec65
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-53047
- https://nvd.nist.gov/vuln/detail/CVE-2024-53047
- https://launchpad.net/bugs/cve/CVE-2024-53047
- https://security-tracker.debian.org/tracker/CVE-2024-53047
- https://ubuntu.com/security/CVE-2024-53047
- https://git.kernel.org/linus/3deb12c788c385e17142ce6ec50f769852fcec65
Frequently Asked Questions
What is the severity of CVE-2024-53047?
CVE-2024-53047 has been classified as a moderate severity vulnerability due to the potential for warnings during MPTCP socket creation.
How do I fix CVE-2024-53047?
To resolve CVE-2024-53047, users should update to a patched version of the Linux kernel that addresses the vulnerability.
Which versions of the Linux kernel are affected by CVE-2024-53047?
CVE-2024-53047 affects the Linux kernel versions from 6.7 to 6.11.7 and specific release candidates of version 6.12.
What impact does CVE-2024-53047 have on system performance?
CVE-2024-53047 may lead to warnings related to scheduling when MPTCP sockets are created, potentially impacting application performance.
Is CVE-2024-53047 related to MPTCP functionality in Linux?
Yes, CVE-2024-53047 specifically affects the MultiPath TCP (MPTCP) functionality in the Linux kernel.
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