CVE - CVE-2021-46974

CVE-ID
CVE-2021-46974	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
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.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/0e2dfdc74a7f4036127356d42ea59388f153f42c URL:https://git.kernel.org/stable/c/0e2dfdc74a7f4036127356d42ea59388f153f42c MISC:https://git.kernel.org/stable/c/2cfa537674cd1051a3b8111536d77d0558f33d5d URL:https://git.kernel.org/stable/c/2cfa537674cd1051a3b8111536d77d0558f33d5d MISC:https://git.kernel.org/stable/c/4d542ddb88fb2f39bf7f14caa2902f3e8d06f6ba URL:https://git.kernel.org/stable/c/4d542ddb88fb2f39bf7f14caa2902f3e8d06f6ba MISC:https://git.kernel.org/stable/c/53e0db429b37a32b8fc706d0d90eb4583ad13848 URL:https://git.kernel.org/stable/c/53e0db429b37a32b8fc706d0d90eb4583ad13848 MISC:https://git.kernel.org/stable/c/6eba92a4d4be8feb4dc33976abac544fa99d6ecc URL:https://git.kernel.org/stable/c/6eba92a4d4be8feb4dc33976abac544fa99d6ecc MISC:https://git.kernel.org/stable/c/7cf64d8679ca1cb20cf57d6a88bfee79a0922a66 URL:https://git.kernel.org/stable/c/7cf64d8679ca1cb20cf57d6a88bfee79a0922a66 MISC:https://git.kernel.org/stable/c/b9b34ddbe2076ade359cd5ce7537d5ed019e9807 URL:https://git.kernel.org/stable/c/b9b34ddbe2076ade359cd5ce7537d5ed019e9807
Assigning CNA
kernel.org
Date Record Created
20240227	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20240227)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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