Improper Input Validation Affecting kernel-rt-devel package, versions *
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Test your applications- Snyk ID SNYK-CENTOS7-KERNELRTDEVEL-6328613
- published 29 Feb 2024
- disclosed 27 Feb 2024
Introduced: 27 Feb 2024
CVE-2021-46974 Open this link in a new tabHow to fix?
There is no fixed version for Centos:7 kernel-rt-devel.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-devel package and not the kernel-rt-devel package as distributed by Centos.
See How to fix? for Centos:7 relevant fixed versions and status.
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
- https://access.redhat.com/security/cve/CVE-2021-46974
- 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