Improper Input Validation Affecting kernel-rt-core package, versions *
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Test your applications- Snyk ID SNYK-CENTOS8-KERNELRTCORE-6336285
- published 29 Feb 2024
- disclosed 28 Feb 2024
Introduced: 28 Feb 2024
CVE-2021-47001 Open this link in a new tabHow to fix?
There is no fixed version for Centos:8 kernel-rt-core.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-core package and not the kernel-rt-core package as distributed by Centos.
See How to fix? for Centos:8 relevant fixed versions and status.
In the Linux kernel, the following vulnerability has been resolved:
xprtrdma: Fix cwnd update ordering
After a reconnect, the reply handler is opening the cwnd (and thus enabling more RPC Calls to be sent) /before/ rpcrdma_post_recvs() can post enough Receive WRs to receive their replies. This causes an RNR and the new connection is lost immediately.
The race is most clearly exposed when KASAN and disconnect injection are enabled. This slows down rpcrdma_rep_create() enough to allow the send side to post a bunch of RPC Calls before the Receive completion handler can invoke ib_post_recv().
References
- https://access.redhat.com/security/cve/CVE-2021-47001
- https://git.kernel.org/stable/c/19b5fa9489b5706bc878c3a522a7f771079e2fa0
- https://git.kernel.org/stable/c/35d8b10a25884050bb3b0149b62c3818ec59f77c
- https://git.kernel.org/stable/c/8834ecb5df22b7ff3c9b0deba7726579bb613f95
- https://git.kernel.org/stable/c/eddae8be7944096419c2ae29477a45f767d0fcd4