CVE-2026-52954

Description

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 ]

CVSS breakdown

Affected products

• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – c7bf7864e2924fa5508ac270b0e9364bc13d5a6c
• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – f47430fc1f815e87406e2d3b4e476eff1bc7fd9b
• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – 0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da
• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – 534ebc08df97c47d4c7596f336fa31ecbf91519c
• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – 80c73bd1b2b04355d1d0c29be8ccbd25a380905d
• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – 4d2b37abda9536808655830d683dc491d31741a8
• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – 0a1265a9ab875f92b6a3ffb497404f46cf9d76a3
• Linux / Linux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 – d289478cfc0bcf81c7914200d6abdcb78bd04ded
• Linux / Linux0 – 5.10.258
• Linux / Linux0 – 5.15.209
• Linux / Linux0 – 6.1.175
• Linux / Linux0 – 6.6.141
• Linux / Linux0 – 6.12.91
• Linux / Linux0 – 6.18.33
• Linux / Linux0 – 7.0.10
• Linux / Linux5.10.258 – 5.10.*
• Linux / Linux5.15.209 – 5.15.*
• Linux / Linux6.1.175 – 6.1.*
• Linux / Linux6.6.141 – 6.6.*
• Linux / Linux6.12.91 – 6.12.*
• Linux / Linux6.18.33 – 6.18.*
• Linux / Linux7.0.10 – 7.0.*
• Linux / Linux7.1 – *

References

• MISChttps://git.kernel.org/stable/c/c7bf7864e2924fa5508ac270b0e9364bc13d5a6c
• MISChttps://git.kernel.org/stable/c/f47430fc1f815e87406e2d3b4e476eff1bc7fd9b
• MISChttps://git.kernel.org/stable/c/0b6a3bcb91bc5bfeda39f0df3b71bab62c13e9da
• MISChttps://git.kernel.org/stable/c/534ebc08df97c47d4c7596f336fa31ecbf91519c
• MISChttps://git.kernel.org/stable/c/80c73bd1b2b04355d1d0c29be8ccbd25a380905d
• MISChttps://git.kernel.org/stable/c/4d2b37abda9536808655830d683dc491d31741a8
• MISChttps://git.kernel.org/stable/c/0a1265a9ab875f92b6a3ffb497404f46cf9d76a3
• MISChttps://git.kernel.org/stable/c/d289478cfc0bcf81c7914200d6abdcb78bd04ded