Vulnerability Details : CVE-2021-46974
In the Linux kernel, the following vulnerability has been resolved:
bpf: Fix masking negation logic upon negative dst register
The negation logic for the case where the off_reg is sitting in the
dst register is not correct given then we cannot just invert the add
to a sub or vice versa. As a fix, perform the final bitwise and-op
unconditionally into AX from the off_reg, then move the pointer from
the src to dst and finally use AX as the source for the original
pointer arithmetic operation such that the inversion yields a correct
result. The single non-AX mov in between is possible given constant
blinding is retaining it as it's not an immediate based operation.
Products affected by CVE-2021-46974
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Exploit prediction scoring system (EPSS) score for CVE-2021-46974
0.04%
Probability of exploitation activity in the next 30 days
EPSS Score History
~ 5 %
Percentile, the proportion of vulnerabilities that are scored at or less
CVSS scores for CVE-2021-46974
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
|
NIST | 2025-01-09 |
References for CVE-2021-46974
-
https://git.kernel.org/stable/c/b9b34ddbe2076ade359cd5ce7537d5ed019e9807
bpf: Fix masking negation logic upon negative dst register - kernel/git/stable/linux.git - Linux kernel stable treePatch
-
https://git.kernel.org/stable/c/2cfa537674cd1051a3b8111536d77d0558f33d5d
bpf: Fix masking negation logic upon negative dst register - kernel/git/stable/linux.git - Linux kernel stable treePatch
-
https://git.kernel.org/stable/c/4d542ddb88fb2f39bf7f14caa2902f3e8d06f6ba
bpf: Fix masking negation logic upon negative dst register - kernel/git/stable/linux.git - Linux kernel stable treePatch
-
https://git.kernel.org/stable/c/53e0db429b37a32b8fc706d0d90eb4583ad13848
bpf: Fix masking negation logic upon negative dst register - kernel/git/stable/linux.git - Linux kernel stable treePatch
-
https://git.kernel.org/stable/c/0e2dfdc74a7f4036127356d42ea59388f153f42c
bpf: Fix masking negation logic upon negative dst register - kernel/git/stable/linux.git - Linux kernel stable treePatch
-
https://git.kernel.org/stable/c/7cf64d8679ca1cb20cf57d6a88bfee79a0922a66
bpf: Fix masking negation logic upon negative dst register - kernel/git/stable/linux.git - Linux kernel stable treePatch
-
https://git.kernel.org/stable/c/6eba92a4d4be8feb4dc33976abac544fa99d6ecc
bpf: Fix masking negation logic upon negative dst register - kernel/git/stable/linux.git - Linux kernel stable treePatch
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