CVE-2026-52956
published 2026-06-24CVE-2026-52956: 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…
PriorityP342high7.5CVSS 3.1
AVNACLPRNUINSUCNINAH
EPSS
0.36%
28.0th percentile
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.
Affected
6 ranges
| Vendor | Product | Version range | Fixed in |
|---|---|---|---|
| linux | linux | — | — |
| linux | linux | — | — |
| linux | linux | >= 4.9.6 < 4.10 | 4.10 |
| linux | linux | >= e15fd0a11db00fc7f470a9fc804657ec3f6d04a5 < c7e9b53aebe401970f1b5f5a01b4e021b18e8bb2 | c7e9b53aebe401970f1b5f5a01b4e021b18e8bb2 |
| linux | linux | >= e15fd0a11db00fc7f470a9fc804657ec3f6d04a5 < 821365487aa58d06bda65c676ba215d506ba9768 | 821365487aa58d06bda65c676ba215d506ba9768 |
| linux | linux_kernel | — | — |
CVSS provenance
nvdv3.17.5HIGHCVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
vendor_redhat7.0MEDIUM
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VulDB
Linux Kernel up to 7.0.9 libceph __ceph_x_decrypt function out-of-bounds (WID-SEC-2026-2077)
vuldb·2026-06-29·CVSS 7.5
CVE-2026-52956 [HIGH] Linux Kernel up to 7.0.9 libceph __ceph_x_decrypt function out-of-bounds (WID-SEC-2026-2077)
A vulnerability has been found in Linux Kernel up to 7.0.9 and classified as critical. The affected element is the function __ceph_x_decrypt of the component libceph. The manipulation of the argument function leads to out-of-bounds read.
This vulnerability is listed as CVE-2026-52956. The attack must be carried out from within the local network. There is no available exploit.
The affected component should be upgraded.
GHSA
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
ghsa_unreviewed·2026-06-24
CVE-2026-52956 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
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 acces
Red Hat
kernel: libceph: Fix potential out-of-bounds access in __ceph_x_decrypt()
vendor_redhat·2026-06-24·CVSS 7.0
CVE-2026-52956 [MEDIUM] CWE-125 kernel: libceph: Fix potential out-of-bounds access in __ceph_x_decrypt()
kernel: libceph: Fix potential out-of-bounds access in __ceph_x_decrypt()
A flaw was found in the Linux kernel's `libceph` module. A remote attacker could trigger an out-of-bounds memory access in the `__ceph_x_decrypt()` function by sending a specially crafted message frame of type `FRAME_TAG_AUTH_REPLY_MORE` with a small ciphertext length. This vulnerability arises because the function interprets a buffer as a `ceph_x_encrypt_header` without ensuring the buffer is large enough. Successful exploitation could lead to a denial of service or other unpredictable system behavior.
Package: kernel (Red Hat Enterprise Linux 10) - Affected
Package: kernel (Red Hat Enterprise Linux 6) - Not affected
Package: kernel (Red Hat Enterprise Linux 7) - Affected
Package: kernel-rt (Red Hat Enterprise
No detection rules found.
No public exploits indexed.
2026-06-24
Published