Bug 2328788 (CVE-2024-53099)

Summary: CVE-2024-53099 kernel: bpf: Check validity of link->type in bpf_link_show_fdinfo()
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: medium    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
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Hardware: All   
OS: Linux   
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Bug Depends On: 2328806    
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Description OSIDB Bzimport 2024-11-25 22:01:03 UTC 
In the Linux kernel, the following vulnerability has been resolved:

bpf: Check validity of link->type in bpf_link_show_fdinfo()

If a newly-added link type doesn't invoke BPF_LINK_TYPE(), accessing
bpf_link_type_strs[link->type] may result in an out-of-bounds access.

To spot such missed invocations early in the future, checking the
validity of link->type in bpf_link_show_fdinfo() and emitting a warning
when such invocations are missed.
Comment 1 Robb Gatica 2024-11-25 22:20:14 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024112506-CVE-2024-53099-e454@gregkh/T