CVE-2026-22984 in Linux
Summary
by MITRE • 01/23/2026
In the Linux kernel, the following vulnerability has been resolved:
libceph: prevent potential out-of-bounds reads in handle_auth_done()
Perform an explicit bounds check on payload_len to avoid a possible out-of-bounds access in the callout.
[ idryomov: changelog ]
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Analysis
by VulDB Data Team • 05/18/2026
The vulnerability identified as CVE-2026-22984 resides within the Linux kernel's ceph storage subsystem, specifically in the libceph library component. This issue manifests as a potential out-of-bounds read condition that could be exploited to compromise system integrity. The flaw occurs during authentication handling processes when the system processes authentication responses from ceph storage clusters. The vulnerability is particularly concerning as it affects the foundational storage communication mechanisms that many enterprise systems rely upon for data management and retrieval operations.
The technical root cause of this vulnerability stems from insufficient input validation within the handle_auth_done() function. The system fails to perform explicit bounds checking on the payload_len parameter before utilizing it in memory access operations. This oversight creates a scenario where an attacker could craft malicious authentication responses with specially crafted payload length values that exceed expected boundaries. When the system processes these malformed inputs without proper validation, it attempts to access memory regions beyond the allocated buffer boundaries, resulting in out-of-bounds read operations. This type of vulnerability falls under the CWE-129 category of Improper Validation of Array Index, specifically manifesting as an out-of-bounds read condition that can lead to information disclosure or system instability.
The operational impact of this vulnerability extends beyond simple data corruption or system crashes. Attackers could potentially leverage this out-of-bounds read to extract sensitive information from kernel memory spaces, including cryptographic keys, authentication tokens, or other confidential data that might be stored in adjacent memory regions. The implications are particularly severe in environments where ceph storage clusters are deployed, as these systems often handle critical enterprise data and may be targeted by sophisticated adversaries seeking to gain unauthorized access to storage resources. The vulnerability could also contribute to denial of service conditions if the out-of-bounds access causes system instability or crashes. According to ATT&CK framework category T1059, this vulnerability could enable adversaries to perform command execution or information gathering through memory corruption techniques.
Mitigation strategies for CVE-2026-22984 should focus on implementing proper bounds checking mechanisms within the affected code paths. The recommended approach involves adding explicit validation of payload_len values before any memory access operations occur, ensuring that all input parameters fall within acceptable ranges. System administrators should prioritize applying the kernel patches that address this specific vulnerability, as these updates typically include the necessary bounds checking implementations. Additionally, monitoring systems should be configured to detect unusual authentication patterns or malformed payload lengths that might indicate exploitation attempts. The fix should be validated through comprehensive testing to ensure that legitimate authentication flows remain unaffected while preventing the out-of-bounds access conditions. Organizations utilizing ceph storage systems should also consider implementing network segmentation and access controls to limit potential attack vectors, as the vulnerability requires network-based interaction to be exploited effectively.