CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
NONE
Integrity Impact
NONE
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
AI Score
Confidence
Low
EPSS
Percentile
5.1%
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:
Ā io_cqring_event_overflow+0x1c0/0x230 io_uring/io_uring.c:734
Ā io_req_cqe_overflow+0x5c/0x70 io_uring/io_uring.c:773
Ā io_fill_cqe_req io_uring/io_uring.h:168 [inline]
Ā io_do_iopoll+0x474/0x62c io_uring/rw.c:1065
Ā io_iopoll_try_reap_events+0x6c/0x108 io_uring/io_uring.c:1513
Ā io_uring_try_cancel_requests+0x13c/0x258 io_uring/io_uring.c:3056
Ā io_ring_exit_work+0xec/0x390 io_uring/io_uring.c:2869
Ā process_one_work+0x2d8/0x504 kernel/workqueue.c:2289
Ā worker_thread+0x340/0x610 kernel/workqueue.c:2436
Ā kthread+0x12c/0x158 kernel/kthread.c:376
Ā 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 itās getting more complicated for IOPOLL|SQPOLL,
for which __io_cqring_overflow_flush() happens from the CQ waiting path.
Vendor | Product | Version | CPE |
---|---|---|---|
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
linux | linux_kernel | 6.2 | cpe:2.3:o:linux:linux_kernel:6.2:rc1:*:*:*:*:*:* |
linux | linux_kernel | 6.2 | cpe:2.3:o:linux:linux_kernel:6.2:rc2:*:*:*:*:*:* |
linux | linux_kernel | 6.2 | cpe:2.3:o:linux:linux_kernel:6.2:rc3:*:*:*:*:*:* |
[
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "unaffected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"io_uring/rw.c"
],
"versions": [
{
"version": "1da177e4c3f4",
"lessThan": "de77faee2801",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "ed4629d1e968",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "7fc3990dad04",
"status": "affected",
"versionType": "git"
},
{
"version": "1da177e4c3f4",
"lessThan": "544d163d659d",
"status": "affected",
"versionType": "git"
}
]
},
{
"product": "Linux",
"vendor": "Linux",
"defaultStatus": "affected",
"repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
"programFiles": [
"io_uring/rw.c"
],
"versions": [
{
"version": "5.10.165",
"lessThanOrEqual": "5.10.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "5.15.89",
"lessThanOrEqual": "5.15.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.1.7",
"lessThanOrEqual": "6.1.*",
"status": "unaffected",
"versionType": "custom"
},
{
"version": "6.2",
"lessThanOrEqual": "*",
"status": "unaffected",
"versionType": "original_commit_for_fix"
}
]
}
]