In the Linux kernel, the following vulnerability has been resolved:

libceph: Fix potential out-of-bounds access in crush_decode()

A message of type CEPH_MSG_OSD_MAP containing a crush map with at least
one bucket has two fields holding the bucket algorithm. If the values
in these two fields differ, an out-of-bounds access can occur. This is
the case because the first algorithm field (alg) is used to allocate
the correct amount of memory for a bucket of this type, while the second
algorithm field inside the bucket (b->alg) is used in the subsequent
processing.

This patch fixes the issue by adding a check that compares alg and
b->alg and aborts the processing in case they differ. Furthermore,
b->alg is set to 0 in this case, because the destruction of the crush
map also uses this field to determine the bucket type, which can again
result in an out-of-bounds access when trying to free the memory pointed
to by the fields of the bucket. To correctly free the memory allocated
for the bucket in such a case, the corresponding call to kfree is moved
from the algorithm-specific crush_destroy_bucket functions to the
generic crush_destroy_bucket().

https://git.kernel.org/stable/c/0f3604cbe4df14c5e58288ac9f57511e726a222d

https://git.kernel.org/stable/c/3f42508191e129ee6b5ea96578d5cab14f2a013a

https://git.kernel.org/stable/c/4c79fc2d598694bda845b46229c9d48b65042970

https://git.kernel.org/stable/c/6e70ef53e818c53eab28d7b0026b7fd03dddaba5

https://git.kernel.org/stable/c/cceb10023e76bc89f3fe9238ebd0ccab0fc7c7c5

https://git.kernel.org/stable/c/ea0d42137f0c06da71e37ffc647aab4c5309599a

https://git.kernel.org/stable/c/ebe76d58a48a48031b98543d86c4cd30a825b622

https://git.kernel.org/stable/c/fb176a99e4c1a5a8448a83d83d3606203ba81faa

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