Bug 2432384 (CVE-2026-22991)

Summary: CVE-2026-22991 kernel: libceph: make free_choose_arg_map() resilient to partial allocation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Version: unspecifiedKeywords: Security
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OS: Linux   
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Description OSIDB Bzimport 2026-01-23 16:02:13 UTC 
In the Linux kernel, the following vulnerability has been resolved:

libceph: make free_choose_arg_map() resilient to partial allocation

free_choose_arg_map() may dereference a NULL pointer if its caller fails
after a partial allocation.

For example, in decode_choose_args(), if allocation of arg_map->args
fails, execution jumps to the fail label and free_choose_arg_map() is
called. Since arg_map->size is updated to a non-zero value before memory
allocation, free_choose_arg_map() will iterate over arg_map->args and
dereference a NULL pointer.

To prevent this potential NULL pointer dereference and make
free_choose_arg_map() more resilient, add checks for pointers before
iterating.
Comment 1 Keith Grant 2026-01-23 19:59:31 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026012351-CVE-2026-22991-e4a2@gregkh/T