Out-of-bounds Write Affecting kernel-rt-debug-kvm package, versions *
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Test your applications- Snyk ID SNYK-CENTOS7-KERNELRTDEBUGKVM-7196229
- published 3 Jun 2024
- disclosed 30 May 2024
Introduced: 30 May 2024
CVE-2024-36883 Open this link in a new tabHow to fix?
There is no fixed version for Centos:7 kernel-rt-debug-kvm.
NVD Description
Note: Versions mentioned in the description apply only to the upstream kernel-rt-debug-kvm package and not the kernel-rt-debug-kvm 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:
net: fix out-of-bounds access in ops_init
net_alloc_generic is called by net_alloc, which is called without any locking. It reads max_gen_ptrs, which is changed under pernet_ops_rwsem. It is read twice, first to allocate an array, then to set s.len, which is later used to limit the bounds of the array access.
It is possible that the array is allocated and another thread is registering a new pernet ops, increments max_gen_ptrs, which is then used to set s.len with a larger than allocated length for the variable array.
Fix it by reading max_gen_ptrs only once in net_alloc_generic. If max_gen_ptrs is later incremented, it will be caught in net_assign_generic.
References
- https://access.redhat.com/security/cve/CVE-2024-36883
- https://git.kernel.org/stable/c/0c3248bc708a7797be573214065cf908ff1f54c7
- https://git.kernel.org/stable/c/2d60ff5874aefd006717ca5e22ac1e25eac29c42
- https://git.kernel.org/stable/c/3cdc34d76c4f777579e28ad373979d36c030cfd3
- https://git.kernel.org/stable/c/7b0e64583eab8c1d896b47e5dd0bf2e7d86ec41f
- https://git.kernel.org/stable/c/9518b79bfd2fbf99fa9b7e8e36bcb1825e7ba030
- https://git.kernel.org/stable/c/a26ff37e624d12e28077e5b24d2b264f62764ad6
- https://git.kernel.org/stable/c/b6dbfd5bcc267a95a0bf1bf96af46243f96ec6cd
- https://git.kernel.org/stable/c/f4f94587e1bf87cb40ec33955a9d90148dd026ab
- https://lists.debian.org/debian-lts-announce/2024/06/msg00019.html
- https://lists.debian.org/debian-lts-announce/2024/06/msg00020.html