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CVE-2021-46974 Detail

Description

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.


Metrics

NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

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Hyperlink Resource
https://git.kernel.org/stable/c/0e2dfdc74a7f4036127356d42ea59388f153f42c
https://git.kernel.org/stable/c/2cfa537674cd1051a3b8111536d77d0558f33d5d
https://git.kernel.org/stable/c/4d542ddb88fb2f39bf7f14caa2902f3e8d06f6ba
https://git.kernel.org/stable/c/53e0db429b37a32b8fc706d0d90eb4583ad13848
https://git.kernel.org/stable/c/6eba92a4d4be8feb4dc33976abac544fa99d6ecc
https://git.kernel.org/stable/c/7cf64d8679ca1cb20cf57d6a88bfee79a0922a66
https://git.kernel.org/stable/c/b9b34ddbe2076ade359cd5ce7537d5ed019e9807

Weakness Enumeration

CWE-ID CWE Name Source

Change History

3 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2021-46974
NVD Published Date:
02/27/2024
NVD Last Modified:
02/28/2024
Source:
kernel.org