Bug 2402201 (CVE-2023-53681)

Summary: CVE-2023-53681 kernel: bcache: Fix __bch_btree_node_alloc to make the failure behavior consistent
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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OS: Linux   
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Description OSIDB Bzimport 2025-10-07 16:02:32 UTC 
In the Linux kernel, the following vulnerability has been resolved:

bcache: Fix __bch_btree_node_alloc to make the failure behavior consistent

In some specific situations, the return value of __bch_btree_node_alloc
may be NULL. This may lead to a potential NULL pointer dereference in
caller function like a calling chain :
btree_split->bch_btree_node_alloc->__bch_btree_node_alloc.

Fix it by initializing the return value in __bch_btree_node_alloc.
Comment 1 Jon Moroney 2025-10-07 20:45:58 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025100708-CVE-2023-53681-7a5a@gregkh/T