CVE-2026-22984
📋 TL;DR
This CVE describes an out-of-bounds read vulnerability in the Linux kernel's libceph component within the handle_auth_done() function. Attackers could potentially read kernel memory beyond allocated buffers, which could lead to information disclosure or system crashes. This affects systems using Ceph distributed storage with vulnerable Linux kernel versions.
💻 Affected Systems
- Linux kernel with libceph module
📦 What is this software?
Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →Linux Kernel by Linux
The Linux Kernel is the core component of the Linux operating system, serving as the critical interface between computer hardware and software processes. As the heart of millions of servers, cloud infrastructure, embedded systems, Android devices, and IoT deployments worldwide, the Linux Kernel mana...
Learn more about Linux Kernel →⚠️ Risk & Real-World Impact
Worst Case
Kernel memory disclosure leading to privilege escalation, system compromise, or denial of service through kernel panic.
Likely Case
Information disclosure of kernel memory contents or system instability/crashes.
If Mitigated
Limited impact if proper kernel hardening and access controls are implemented.
🎯 Exploit Status
Exploitation requires access to Ceph cluster and ability to trigger the vulnerable code path.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions containing commits: 194cfe2af4d2a1de599d39dad636b47c2f6c2c96, 2802ef3380fa8c4a08cda51ec1f085b1a712e9e2, 2d653bb63d598ae4b096dd678744bdcc34ee89e8, 79fe3511db416d2f2edcfd93569807cb02736e5e, 818156caffbf55cb4d368f9c3cac64e458fb49c9
Vendor Advisory: https://git.kernel.org/stable/c/194cfe2af4d2a1de599d39dad636b47c2f6c2c96
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version from your distribution vendor. 2. Reboot system to load new kernel. 3. Verify kernel version after reboot.
🔧 Temporary Workarounds
Disable Ceph module
linuxUnload libceph kernel module if Ceph storage is not required
sudo rmmod libceph
Restrict Ceph access
allImplement strict network access controls to Ceph cluster
🧯 If You Can't Patch
- Implement strict network segmentation for Ceph traffic
- Monitor for unusual Ceph authentication attempts and system crashes
🔍 How to Verify
Check if Vulnerable:
Check if libceph module is loaded: lsmod | grep libceph. Check kernel version against patched versions.Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes the fix commits and libceph module loads without errors.📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- Ceph authentication failures
- System crash dumps
Network Indicators:
- Unusual Ceph authentication traffic patterns
SIEM Query:
source="kernel" AND ("panic" OR "Oops" OR "libceph")🔗 References
- https://git.kernel.org/stable/c/194cfe2af4d2a1de599d39dad636b47c2f6c2c96
- https://git.kernel.org/stable/c/2802ef3380fa8c4a08cda51ec1f085b1a712e9e2
- https://git.kernel.org/stable/c/2d653bb63d598ae4b096dd678744bdcc34ee89e8
- https://git.kernel.org/stable/c/79fe3511db416d2f2edcfd93569807cb02736e5e
- https://git.kernel.org/stable/c/818156caffbf55cb4d368f9c3cac64e458fb49c9
- https://git.kernel.org/stable/c/ef208ea331ef688729f64089b895ed1b49e842e3
