CVE-2026-52954
In the Linux kernel, the following vulnerability has been resolved: libceph: handle rbtree insertion error in decode_choose_args() A message of type CEPH_MSG_OSD_MAP contains an OSD map that itself contains a CRUSH map. The received CRUSH map may optionally contain choose_args that get decoded in decode_choose_args(). In this function, num_choose_arg_maps is read from the message, and a corresponding number of crush_choose_arg_maps gets decoded afterwards. Each crush_choose_arg_map has a choose_args_index, which serves as the key when inserting it into the choose_args rbtree of the decoded crush_map. If a (potentially corrupted) message contains two crush_choose_arg_maps with the same index, the assertion in insert_choose_arg_map() triggers a kernel BUG when trying to insert the second crush_choose_arg_map. This patch fixes the issue by switching to the non-asserting rbtree insertion function and rejecting the message if the insertion fails. [ idryomov: changelog ]
Affected versions
Fixed in
5.10.258,
5.15.209,
6.1.175,
6.6.141,
6.12.91,
6.18.33,
7.0.10,
7.1
and their respective stable series.
References
8 totalFrequently asked questions
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What is CVE-2026-52954?
CVE-2026-52954 is a unscored severity Linux kernel vulnerability . CVE-2026-52954 has not been confirmed as actively exploited and is not listed in the CISA KEV catalog.
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Is there a patch available for CVE-2026-52954?
Yes — CVE-2026-52954 has been patched. Fixed versions include 5.10.258, 5.15.209, 6.1.175 and others.
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Is CVE-2026-52954 actively exploited?
No — CVE-2026-52954 has not been confirmed as actively exploited. It is not listed in the CISA Known Exploited Vulnerabilities (KEV) catalog.