PT-2026-51849 · Linux · Linux
Publicado
2026-06-24
·
Atualizado
2026-06-24
·
CVE-2026-52955
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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().
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