CVE-2021-47312

Summary

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")

Affected Software

VendorProductVersion RangeStatus
LinuxLinux09b1f676e2e0bbff67c568672c565c6f31470157 < 70a5a1950cca02c5cd161bb3846b4d983eed97d3affected
LinuxLinux3c5e44622011b9ea21bd425875dcccfc9a158f5f < 4ca041f919f13783b0b03894783deee00dbca19aaffected
LinuxLinux5.13.2 < 5.13.5affected

Weaknesses

ADP Enrichment

CISA ADP Vulnrichment

  • SSVC:
  • Exploitation: none
    • Automatable: no
    • Technical Impact: partial

CVE Program Container

Additional References

References