CVE-2021-47312

netfilter: nf_tables: Fix dereference of null pointer flow

Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: nf_tables: Fix dereference of null pointer flow In the case where chain->flags & NFT_CHAIN_HW_OFFLOAD is false then nft_flow_rule_create is not called and flow is NULL. The subsequent error handling execution via label err_destroy_flow_rule will lead to a null pointer dereference on flow when calling nft_flow_rule_destroy. Since the error path to err_destroy_flow_rule has to cater for null and non-null flows, only call nft_flow_rule_destroy if flow is non-null to fix this issue. Addresses-Coverity: ("Explicity null dereference")

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/70a5a1950cca02c5cd161bb3846b4d983eed97d3 patch
https://git.kernel.org/stable/c/4ca041f919f13783b0b03894783deee00dbca19a patch

Frequently Asked Questions

What is the severity of CVE-2021-47312?
CVE-2021-47312 has been scored as a medium severity vulnerability.
How to fix CVE-2021-47312?
To fix CVE-2021-47312, 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-2021-47312 being actively exploited in the wild?
As for now, there are no information to confirm that CVE-2021-47312 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-2021-47312?
CVE-2021-47312 affects Linux Linux, Linux Linux.
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