CVE-2023-54176: In the Linux kernel, the following vulnerability has been resolved: mptcp: stricter state check in mptcp_worker As reported by Christoph, the mptcp protocol…

PriorityP421medium5.8

EPSS

0.17%

7.1th percentile

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

mptcp: stricter state check in mptcp_worker

As reported by Christoph, the mptcp protocol can run the
worker when the relevant msk socket is in an unexpected state:

connect()
// incoming reset + fastclose
// the mptcp worker is scheduled
mptcp_disconnect()
// msk is now CLOSED
listen()
mptcp_worker()

Leading to the following splat:

divide error: 0000 [#1] PREEMPT SMP
CPU: 1 PID: 21 Comm: kworker/1:0 Not tainted 6.3.0-rc1-gde5e8fd0123c #11
Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS 1.11.0-2.el7 04/01/2014
Workqueue: events mptcp_worker
RIP: 0010:__tcp_select_window+0x22c/0x4b0 net/ipv4/tcp_output.c:3018
RSP: 0018:ffffc900000b3c98 EFLAGS: 00010293
RAX: 000000000000ffd7 RBX: 000000000000ffd7 RCX: 0000000000000000
RDX: 0000000000000000 RSI: ffffffff8214ce97 RDI: 0000000000000004
RBP: 000000000000ffd7 R08: 0000000000000004 R09: 0000000000010000
R10: 000000000000ffd7 R11: ffff888005afa148 R12: 000000000000ffd7
R13: 0000000000000000 R14: 0000000000000000 R15: 0000000000000000
FS: 0000000000000000(0000) GS:ffff88803ed00000(0000) knlGS:0000000000000000
CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
CR2: 0000000000405270 CR3: 000000003011e006 CR4: 0000000000370ee0
DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000
DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400
Call Trace:

tcp_select_window net/ipv4/tcp_output.c:262 [inline]
__tcp_transmit_skb+0x356/0x1280 net/ipv4/tcp_output.c:1345
tcp_transmit_skb net/ipv4/tcp_output.c:1417 [inline]
tcp_send_active_reset+0x13e/0x320 net/ipv4/tcp_output.c:3459
mptcp_check_fastclose net/mptcp/protocol.c:2530 [inline]
mptcp_worker+0x6c7/0x800 net/mptcp/protocol.c:2705
process_one_work+0x3bd/0x950 kernel/workqueue.c:2390
worker_thread+0x5b/0x610 kernel/workqueue.c:2537
kthread+0x138/0x170 kernel/kthread.c:376
ret_from_fork+0x2c/0x50 arch/x86/entry/entry_64.S:308


This change addresses the issue explicitly checking for ba

Affected

12 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.25-1 (bookworm)	linux 6.1.25-1 (bookworm)
linux	linux	—	—
linux	linux	>= e16163b6e2b720fb74e5af758546f6dad27e6c9e < f0b4a4086cf27240fc621a560da9735159049dcc	f0b4a4086cf27240fc621a560da9735159049dcc
linux	linux	>= e16163b6e2b720fb74e5af758546f6dad27e6c9e < aff9099e9c51f15c8def05c75b2b73e8487b5d54	aff9099e9c51f15c8def05c75b2b73e8487b5d54
linux	linux	>= e16163b6e2b720fb74e5af758546f6dad27e6c9e < 19ea79e87af32c2b3c6fc49bd84efeb35ca57678	19ea79e87af32c2b3c6fc49bd84efeb35ca57678
linux	linux	>= e16163b6e2b720fb74e5af758546f6dad27e6c9e < d6a0443733434408f2cbd4c53fea6910599bab9e	d6a0443733434408f2cbd4c53fea6910599bab9e
linux	linux_kernel	>= 0 < 6.1.25-1	6.1.25-1
linux	linux_kernel	>= 0 < 6.1.25-1	6.1.25-1
linux	linux_kernel	>= 0 < 6.1.25-1	6.1.25-1
linux	linux_kernel	>= 5.11.0 < 5.15.108	5.15.108
linux	linux_kernel	>= 5.16.0 < 6.1.25	6.1.25
linux	linux_kernel	>= 6.2.0 < 6.2.12	6.2.12

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