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")
Vulnerability category: Memory Corruption
Products affected by CVE-2021-47312
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-47312
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 9 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-47312
| Base Score | Base Severity | CVSS Vector | Exploitability Score | Impact Score | Score Source | First Seen |
|---|---|---|---|---|---|---|
|
5.5
|
MEDIUM | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
1.8
|
3.6
|
134c704f-9b21-4f2e-91b3-4a467353bcc0 | 2024-11-05 |
CWE ids for CVE-2021-47312
-
The product dereferences a pointer that it expects to be valid but is NULL.Assigned by: 134c704f-9b21-4f2e-91b3-4a467353bcc0 (Secondary)
References for CVE-2021-47312
-
https://git.kernel.org/stable/c/70a5a1950cca02c5cd161bb3846b4d983eed97d3
netfilter: nf_tables: Fix dereference of null pointer flow - kernel/git/stable/linux.git - Linux kernel stable treePatch
-
https://git.kernel.org/stable/c/4ca041f919f13783b0b03894783deee00dbca19a
netfilter: nf_tables: Fix dereference of null pointer flow - kernel/git/stable/linux.git - Linux kernel stable treePatch
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