PT-2026-51850 · Linux · Linux
Publicado
2026-06-24
·
Atualizado
2026-06-24
·
CVE-2026-52956
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In the Linux kernel, the following vulnerability has been resolved:
libceph: Fix potential out-of-bounds access in ceph x decrypt()
In ceph x decrypt(), a part of the buffer p is interpreted as a
ceph x encrypt header, and the magic field of this struct is accessed.
This happens without any guarantee that the buffer is large enough to
hold this struct. The function parameter ciphertext len represents the
length of the ciphertext to decrypt and is guaranteed to be at most the
remaining size of the allocated buffer p. However, this value is not
necessarily greater than sizeof(ceph x encrypt header). E.g., a message
frame of type FRAME TAG AUTH REPLY MORE, that is just as long to hold
the ciphertext at its end with a ciphertext len of 8 or less, can
trigger an out-of-bounds memory access when accessing hdr->magic.
This patch fixes the issue by adding a check to ensure that the
decrypted plaintext in the buffer is large enough to represent at least
the ceph x encrypt header.
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