CVSS3
Attack Vector
LOCAL
Attack Complexity
LOW
Privileges Required
LOW
User Interaction
NONE
Scope
UNCHANGED
Confidentiality Impact
HIGH
Integrity Impact
HIGH
Availability Impact
HIGH
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
EPSS
Percentile
5.1%
In the Linux kernel, the following vulnerability has been resolved:
greybus: Fix use-after-free bug in gb_interface_release due to race condition.
In gb_interface_create, &intf->mode_switch_completion is bound with
gb_interface_mode_switch_work. Then it will be started by
gb_interface_request_mode_switch. Here is the relevant code.
if (!queue_work(system_long_wq, &intf->mode_switch_work)) {
…
}
If we call gb_interface_release to make cleanup, there may be an
unfinished work. This function will call kfree to free the object
“intf”. However, if gb_interface_mode_switch_work is scheduled to
run after kfree, it may cause use-after-free error as
gb_interface_mode_switch_work will use the object “intf”.
The possible execution flow that may lead to the issue is as follows:
CPU0 CPU1
| gb_interface_create
| gb_interface_request_mode_switch
gb_interface_release |
kfree(intf) (free) |
| gb_interface_mode_switch_work
| mutex_lock(&intf->mutex) (use)
Fix it by canceling the work before kfree.
Vendor | Product | Version | CPE |
---|---|---|---|
linux | linux_kernel | * | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* |
git.kernel.org/stable/c/03ea2b129344152157418929f06726989efc0445
git.kernel.org/stable/c/0b8fba38bdfb848fac52e71270b2aa3538c996ea
git.kernel.org/stable/c/2b6bb0b4abfd79b8698ee161bb73c0936a2aaf83
git.kernel.org/stable/c/5c9c5d7f26acc2c669c1dcf57d1bb43ee99220ce
git.kernel.org/stable/c/74cd0a421896b2e07eafe7da4275302bfecef201
git.kernel.org/stable/c/9a733d69a4a59c2d08620e6589d823c24be773dc
git.kernel.org/stable/c/fb071f5c75d4b1c177824de74ee75f9dd34123b9