Out-of-bounds read in Linux kernel - CVE-2026-52956
Published: June 25, 2026
Vulnerability identifier: #VU135427
CSH Severity: Medium
CVSS v4.0: CVSS:4.0/AV:N/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N/E:U/U:Green
CVE-ID: CVE-2026-52956
CWE-ID: CWE-125
Exploitation vector: Remote access
Exploit availability:
No public exploit available
Vendor: Linux Foundation
Affected software:
Linux kernel
Linux kernel
Detailed vulnerability description
The vulnerability allows a remote attacker to cause a denial of service.
The vulnerability exists due to an out-of-bounds read in __ceph_x_decrypt() when processing a crafted Ceph authentication reply message. A remote attacker can send a specially crafted message frame to cause a denial of service.
The issue can be triggered when the ciphertext is too short to contain a ceph_x_encrypt_header, such as in a FRAME_TAG_AUTH_REPLY_MORE message.
How to mitigate CVE-2026-52956
Install security update from vendor's repository.