CVE-2026-22983
📋 TL;DR
This CVE describes a NULL pointer dereference vulnerability in the Linux kernel's net subsystem, specifically in the af_unix socket implementation. The vulnerability occurs when the kernel writes to an input field that should only be read, potentially causing a kernel crash or system instability. This affects Linux systems using unix domain sockets with specific configurations.
💻 Affected Systems
- Linux kernel
📦 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 →⚠️ Risk & Real-World Impact
Worst Case
Kernel panic leading to system crash and denial of service, potentially allowing privilege escalation if combined with other vulnerabilities.
Likely Case
System instability or crash when using unix domain sockets with splicing operations, resulting in denial of service.
If Mitigated
Minimal impact if systems don't use unix domain sockets or have the vulnerable code paths disabled.
🎯 Exploit Status
Exploitation requires local access and specific socket operations. The vulnerability is a NULL pointer dereference which typically leads to crashes rather than arbitrary code execution.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Kernel versions with commit 7d11e047eda5f98514ae62507065ac961981c025 or later
Vendor Advisory: https://git.kernel.org/stable/c/7d11e047eda5f98514ae62507065ac961981c025
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version. 2. Check distribution-specific security advisories. 3. Reboot system after kernel update.
🔧 Temporary Workarounds
Disable unix domain socket splicing
linuxRestrict or monitor usage of unix domain sockets with splicing operations
# Monitor socket operations: ss -x
# Consider restricting socket operations via seccomp or apparmor
🧯 If You Can't Patch
- Restrict local user access to systems
- Monitor system logs for kernel panics or crashes related to socket operations
🔍 How to Verify
Check if Vulnerable:
Check kernel version and if it includes the vulnerable commits. Use: uname -r and examine kernel source.Check Version:
uname -rVerify Fix Applied:
Verify kernel version is updated beyond vulnerable commits. Check for commit 7d11e047eda5f98514ae62507065ac961981c025 in kernel source.📡 Detection & Monitoring
Log Indicators:
- Kernel panic messages
- System crashes
- NULL pointer dereference errors in kernel logs
Network Indicators:
- Local socket operations causing system instability
SIEM Query:
search 'kernel panic' OR 'NULL pointer dereference' OR 'BUG:' in system logs