Description

In the Linux kernel, the following vulnerability has been resolved: mptcp: fix deadlock in __mptcp_push_pending() __mptcp_push_pending() may call mptcp_flush_join_list() with subflow socket lock held. If such call hits mptcp_sockopt_sync_all() then subsequently __mptcp_sockopt_sync() could try to lock the subflow socket for itself, causing a deadlock. sysrq: Show Blocked State task:ss-server state:D stack: 0 pid: 938 ppid: 1 flags:0x00000000 Call Trace: <TASK> __schedule+0x2d6/0x10c0 ? __mod_memcg_state+0x4d/0x70 ? csum_partial+0xd/0x20 ? _raw_spin_lock_irqsave+0x26/0x50 schedule+0x4e/0xc0 __lock_sock+0x69/0x90 ? do_wait_intr_irq+0xa0/0xa0 __lock_sock_fast+0x35/0x50 mptcp_sockopt_sync_all+0x38/0xc0 __mptcp_push_pending+0x105/0x200 mptcp_sendmsg+0x466/0x490 sock_sendmsg+0x57/0x60 __sys_sendto+0xf0/0x160 ? do_wait_intr_irq+0xa0/0xa0 ? fpregs_restore_userregs+0x12/0xd0 __x64_sys_sendto+0x20/0x30 do_syscall_64+0x38/0x90 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7f9ba546c2d0 RSP: 002b:00007ffdc3b762d8 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 00007f9ba56c8060 RCX: 00007f9ba546c2d0 RDX: 000000000000077a RSI: 0000000000e5e180 RDI: 0000000000000234 RBP: 0000000000cc57f0 R08: 0000000000000000 R09: 0000000000000000 R10: 0000000000000000 R11: 0000000000000246 R12: 00007f9ba56c8060 R13: 0000000000b6ba60 R14: 0000000000cc7840 R15: 41d8685b1d7901b8 </TASK> Fix the issue by using __mptcp_flush_join_list() instead of plain mptcp_flush_join_list() inside __mptcp_push_pending(), as suggested by Florian. The sockopt sync will be deferred to the workqueue.

Metrics

 

CVSS Version 4.0 CVSS Version 3.x CVSS Version 2.0

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CVSS 4.0 Severity and Vector Strings:

NIST: NVD

N/A

NVD assessment not yet provided.

CVSS 3.x Severity and Vector Strings:

NIST: NVD

Base Score:  5.5 MEDIUM

Vector:  CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

CVSS 2.0 Severity and Vector Strings:

NIST: NVD

Base Score: N/A

NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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Hyperlink	Resource
https://git.kernel.org/stable/c/23311b92755ffa9087332d1bb8c71c0f6a10cc08	Patch
https://git.kernel.org/stable/c/23311b92755ffa9087332d1bb8c71c0f6a10cc08	Patch
https://git.kernel.org/stable/c/3d79e3756ca90f7a6087b77b62c1d9c0801e0820	Patch
https://git.kernel.org/stable/c/3d79e3756ca90f7a6087b77b62c1d9c0801e0820	Patch

Weakness Enumeration

CWE-ID	CWE Name	Source
CWE-667	Improper Locking	NIST

Known Affected Software Configurations Switch to CPE 2.2

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Change History

3 change records found show changes

CVE Modified by CVE 11/21/2024 1:36:37 AM

Action	Type	Old Value	New Value
Added	Reference		https://git.kernel.org/stable/c/23311b92755ffa9087332d1bb8c71c0f6a10cc08
Added	Reference		https://git.kernel.org/stable/c/3d79e3756ca90f7a6087b77b62c1d9c0801e0820

Initial Analysis by NIST 8/27/2024 12:14:56 PM

Action	Type	Old Value	New Value
Added	CVSS V3.1		NIST AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Added	CWE		NIST CWE-667
Added	CPE Configuration		OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.13 up to (excluding) 5.15.11
Changed	Reference Type	https://git.kernel.org/stable/c/23311b92755ffa9087332d1bb8c71c0f6a10cc08 No Types Assigned	https://git.kernel.org/stable/c/23311b92755ffa9087332d1bb8c71c0f6a10cc08 Patch
Changed	Reference Type	https://git.kernel.org/stable/c/3d79e3756ca90f7a6087b77b62c1d9c0801e0820 No Types Assigned	https://git.kernel.org/stable/c/3d79e3756ca90f7a6087b77b62c1d9c0801e0820 Patch

New CVE Received from kernel.org 6/19/2024 11:15:53 AM

Action	Type	Old Value	New Value
Added	Description		Record truncated, showing 500 of 1640 characters. View Entire Change Record In the Linux kernel, the following vulnerability has been resolved: mptcp: fix deadlock in __mptcp_push_pending() __mptcp_push_pending() may call mptcp_flush_join_list() with subflow socket lock held. If such call hits mptcp_sockopt_sync_all() then subsequently __mptcp_sockopt_sync() could try to lock the subflow socket for itself, causing a deadlock. sysrq: Show Blocked State task:ss-server state:D stack: 0 pid: 938 ppid: 1 flags:0x00000000 Call Trace: <TASK> __schedule+0x2d6
Added	Reference		kernel.org https://git.kernel.org/stable/c/23311b92755ffa9087332d1bb8c71c0f6a10cc08 [No types assigned]
Added	Reference		kernel.org https://git.kernel.org/stable/c/3d79e3756ca90f7a6087b77b62c1d9c0801e0820 [No types assigned]