CVE-2021-47559

net/smc: Fix NULL pointer dereferencing in smc_vlan_by_tcpsk()

Description

In the Linux kernel, the following vulnerability has been resolved: net/smc: Fix NULL pointer dereferencing in smc_vlan_by_tcpsk() Coverity reports a possible NULL dereferencing problem: in smc_vlan_by_tcpsk(): 6. returned_null: netdev_lower_get_next returns NULL (checked 29 out of 30 times). 7. var_assigned: Assigning: ndev = NULL return value from netdev_lower_get_next. 1623 ndev = (struct net_device *)netdev_lower_get_next(ndev, &lower); CID 1468509 (#1 of 1): Dereference null return value (NULL_RETURNS) 8. dereference: Dereferencing a pointer that might be NULL ndev when calling is_vlan_dev. 1624 if (is_vlan_dev(ndev)) { Remove the manual implementation and use netdev_walk_all_lower_dev() to iterate over the lower devices. While on it remove an obsolete function parameter comment.

Category

5.5
CVSS
Severity: Medium
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/c94cbd262b6aa3b54d73a1ed1f9c0d19df57f4ff patch
https://git.kernel.org/stable/c/bb851d0fb02547d03cd40106b5f2391c4fed6ed1 patch
https://git.kernel.org/stable/c/587acad41f1bc48e16f42bb2aca63bf323380be8 patch

Frequently Asked Questions

What is the severity of CVE-2021-47559?
CVE-2021-47559 has been scored as a medium severity vulnerability.
How to fix CVE-2021-47559?
To fix CVE-2021-47559, 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-2021-47559 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-47559 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-2021-47559?
CVE-2021-47559 affects Linux Linux, Linux Linux.
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