Vulnerability Details CVE-2021-47312
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")
Exploit prediction scoring system (EPSS) score
EPSS Score 0.001
EPSS Ranking 15.7%
CVSS Severity
CVSS v3 Score 5.5
References
Products affected by CVE-2021-47312
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cpe:2.3:o:linux:linux_kernel:5.13.2
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cpe:2.3:o:linux:linux_kernel:5.13.3
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cpe:2.3:o:linux:linux_kernel:5.13.4