CVE-2023-52903

published 2024-08-21

CVE-2023-52903: In the Linux kernel, the following vulnerability has been resolved: io_uring: lock overflowing for IOPOLL syzbot reports an issue with overflow filling for…

Priority P4 19 medium 5.5 CVSS 3.1

AV L AC L PR L UI N S U C N I N A H

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

io_uring: lock overflowing for IOPOLL

syzbot reports an issue with overflow filling for IOPOLL:

WARNING: CPU: 0 PID: 28 at io_uring/io_uring.c:734 io_cqring_event_overflow+0x1c0/0x230 io_uring/io_uring.c:734
CPU: 0 PID: 28 Comm: kworker/u4:1 Not tainted 6.2.0-rc3-syzkaller-16369-g358a161a6a9e #0
Workqueue: events_unbound io_ring_exit_work
Call trace:
io_cqring_event_overflow+0x1c0/0x230 io_uring/io_uring.c:734
io_req_cqe_overflow+0x5c/0x70 io_uring/io_uring.c:773
io_fill_cqe_req io_uring/io_uring.h:168 [inline]
io_do_iopoll+0x474/0x62c io_uring/rw.c:1065
io_iopoll_try_reap_events+0x6c/0x108 io_uring/io_uring.c:1513
io_uring_try_cancel_requests+0x13c/0x258 io_uring/io_uring.c:3056
io_ring_exit_work+0xec/0x390 io_uring/io_uring.c:2869
process_one_work+0x2d8/0x504 kernel/workqueue.c:2289
worker_thread+0x340/0x610 kernel/workqueue.c:2436
kthread+0x12c/0x158 kernel/kthread.c:376
ret_from_fork+0x10/0x20 arch/arm64/kernel/entry.S:863

There is no real problem for normal IOPOLL as flush is also called with
uring_lock taken, but it's getting more complicated for IOPOLL|SQPOLL,
for which __io_cqring_overflow_flush() happens from the CQ waiting path.

Affected

16 ranges

Vendor	Product	Version range	Fixed in
debian	linux	< linux 6.1.7-1 (bookworm)	linux 6.1.7-1 (bookworm)
linux	linux	—	—
linux	linux	>= 2b188cc1bb857a9d4701ae59aa7768b5124e262e < de77faee280163ff03b7ab64af6c9d779a43d4c4	de77faee280163ff03b7ab64af6c9d779a43d4c4
linux	linux	>= 2b188cc1bb857a9d4701ae59aa7768b5124e262e < ed4629d1e968359fbb91d0a3780b1e86a2c08845	ed4629d1e968359fbb91d0a3780b1e86a2c08845
linux	linux	>= 2b188cc1bb857a9d4701ae59aa7768b5124e262e < 7fc3990dad04a677606337ebc61964094d6cb41b	7fc3990dad04a677606337ebc61964094d6cb41b
linux	linux	>= 2b188cc1bb857a9d4701ae59aa7768b5124e262e < 544d163d659d45a206d8929370d5a2984e546cb7	544d163d659d45a206d8929370d5a2984e546cb7
linux	linux_kernel	<= 5.10.165	—
linux	linux_kernel	—	—
linux	linux_kernel	—	—
linux	linux_kernel	—	—
linux	linux_kernel	>= 0 < 5.10.178-1	5.10.178-1
linux	linux_kernel	>= 0 < 6.1.7-1	6.1.7-1
linux	linux_kernel	>= 0 < 6.1.7-1	6.1.7-1
linux	linux_kernel	>= 0 < 6.1.7-1	6.1.7-1
linux	linux_kernel	>= 5.11 < 5.15.89	5.15.89
linux	linux_kernel	>= 5.16 < 6.1.7	6.1.7

CVSS provenance

nvd v3.1 5.5 MEDIUM CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

osv 5.5 MEDIUM

vendor_debian 5.5 MEDIUM

vendor_redhat 5.5 MEDIUM

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