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CVE-2026-52956 is an out-of-bounds read in the Linux kernel libceph authentication decryption routine, __ceph_x_decrypt(). The function interprets decrypted buffer data as a ceph_x_encrypt_header and reads its magic field without first verifying that the decrypted plaintext is large enough to contain that structure. Although ciphertext_len is bounded by the remaining allocated buffer size, it can be smaller than the header size. A short Ceph authentication reply, including a FRAME_TAG_AUTH_REPLY_MORE frame with ciphertext data of 8 bytes or fewer, can therefore cause the header-field access to exceed the available buffer. The fix validates that the decrypted plaintext is at least large enough for ceph_x_encrypt_header before accessing the header.
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Potential out-of-bounds access in the Linux kernel libceph decryption routine.
Linux kernel libceph potential out-of-bounds access vulnerability in __ceph_x_decrypt().
A potential out-of-bounds-access vulnerability in the Linux kernel libceph __ceph_x_decrypt() function.
Linux kernel libceph potential out-of-bounds access vulnerability in __ceph_x_decrypt().
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Every observed campaign linking this CVE to a named adversary.
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Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.