CVE-2021-47564

net: marvell: prestera: fix double free issue on err path

Description

In the Linux kernel, the following vulnerability has been resolved: net: marvell: prestera: fix double free issue on err path fix error path handling in prestera_bridge_port_join() that cases prestera driver to crash (see below). Trace: Internal error: Oops: 96000044 [#1] SMP Modules linked in: prestera_pci prestera uio_pdrv_genirq CPU: 1 PID: 881 Comm: ip Not tainted 5.15.0 #1 pstate: 60000005 (nZCv daif -PAN -UAO -TCO -DIT -SSBS BTYPE=--) pc : prestera_bridge_destroy+0x2c/0xb0 [prestera] lr : prestera_bridge_port_join+0x2cc/0x350 [prestera] sp : ffff800011a1b0f0 ... x2 : ffff000109ca6c80 x1 : dead000000000100 x0 : dead000000000122 Call trace: prestera_bridge_destroy+0x2c/0xb0 [prestera] prestera_bridge_port_join+0x2cc/0x350 [prestera] prestera_netdev_port_event.constprop.0+0x3c4/0x450 [prestera] prestera_netdev_event_handler+0xf4/0x110 [prestera] raw_notifier_call_chain+0x54/0x80 call_netdevice_notifiers_info+0x54/0xa0 __netdev_upper_dev_link+0x19c/0x380

Category

7.8
CVSS
Severity: High
CVSS 3.1 •
EPSS 0.04%
Affected: Linux Linux
Affected: Linux Linux
Published at:
Updated at:

References

Link Tags
https://git.kernel.org/stable/c/5dca8eff4627315df98feec09fff9dfe3356325e patch
https://git.kernel.org/stable/c/03e5203d2161a00afe4d97d206d2293e40b2f253 patch
https://git.kernel.org/stable/c/e8d032507cb7912baf1d3e0af54516f823befefd patch

Frequently Asked Questions

What is the severity of CVE-2021-47564?
CVE-2021-47564 has been scored as a high severity vulnerability.
How to fix CVE-2021-47564?
To fix CVE-2021-47564, make sure you are using an up-to-date version of the affected component(s) by checking the vendor release notes. As for now, there are no other specific guidelines available.
Is CVE-2021-47564 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-47564 is being actively exploited. According to its EPSS score, there is a ~0% probability that this vulnerability will be exploited by malicious actors in the next 30 days.
What software or system is affected by CVE-2021-47564?
CVE-2021-47564 affects Linux Linux, Linux Linux.
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