Bug 2324892 (CVE-2024-50262)

Summary: CVE-2024-50262 kernel: bpf: Fix out-of-bounds write in trie_get_next_key()
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: 2325115    
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Description OSIDB Bzimport 2024-11-09 11:03:38 UTC 
In the Linux kernel, the following vulnerability has been resolved:

bpf: Fix out-of-bounds write in trie_get_next_key()

trie_get_next_key() allocates a node stack with size trie->max_prefixlen,
while it writes (trie->max_prefixlen + 1) nodes to the stack when it has
full paths from the root to leaves. For example, consider a trie with
max_prefixlen is 8, and the nodes with key 0x00/0, 0x00/1, 0x00/2, ...
0x00/8 inserted. Subsequent calls to trie_get_next_key with _key with
.prefixlen = 8 make 9 nodes be written on the node stack with size 8.
Comment 1 Avinash Hanwate 2024-11-11 06:34:36 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2024110955-CVE-2024-50262-9cd7@gregkh/T
Comment 2 errata-xmlrpc 2024-12-11 01:19:49 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9.4 Extended Update Support

Via RHSA-2024:10942 https://access.redhat.com/errata/RHSA-2024:10942
Comment 3 errata-xmlrpc 2024-12-19 00:43:31 UTC 
This issue has been addressed in the following products:

  Red Hat Enterprise Linux 9

Via RHSA-2024:11486 https://access.redhat.com/errata/RHSA-2024:11486