CVE-2024-35831
📋 TL;DR
A memory management vulnerability in the Linux kernel's io_uring subsystem where pinned memory pages are not properly released when the __io_uaddr_map function fails. This can lead to memory leaks and potential resource exhaustion. Affects Linux systems using io_uring with fragmented memory conditions.
💻 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 →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
Memory exhaustion leading to system instability, denial of service, or potential privilege escalation through memory corruption.
Likely Case
Memory leaks causing gradual performance degradation and potential system instability under heavy io_uring usage.
If Mitigated
Minor performance impact with no security compromise when proper memory management controls are in place.
🎯 Exploit Status
Requires local access and ability to trigger specific memory fragmentation conditions during io_uring operations.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Patched in kernel commits referenced in CVE (0b6f39c175ba5f0ef72bdb3b9d2a06ad78621d62 and others)
Vendor Advisory: https://git.kernel.org/stable/c/0b6f39c175ba5f0ef72bdb3b9d2a06ad78621d62
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 io_uring
linuxRemove or disable io_uring module if not required
modprobe -r io_uring
echo 'blacklist io_uring' >> /etc/modprobe.d/blacklist.conf
Memory pressure reduction
linuxReduce memory fragmentation through system tuning
sysctl -w vm.vfs_cache_pressure=100
sysctl -w vm.swappiness=10
🧯 If You Can't Patch
- Monitor system memory usage and io_uring processes closely
- Implement memory usage limits for user processes using cgroups
🔍 How to Verify
Check if Vulnerable:
Check kernel version and verify if io_uring is loaded: lsmod | grep io_uringCheck Version:
uname -rVerify Fix Applied:
Verify kernel version includes the fix commits: uname -r and check with distribution patch notes📡 Detection & Monitoring
Log Indicators:
- Kernel oops messages related to memory allocation
- System logs showing memory exhaustion warnings
- io_uring error messages in dmesg
Network Indicators:
- None - local vulnerability only
SIEM Query:
source="kernel" AND ("io_uring" OR "memory allocation failed" OR "page pinning")🔗 References
- https://git.kernel.org/stable/c/0b6f39c175ba5f0ef72bdb3b9d2a06ad78621d62
- https://git.kernel.org/stable/c/4d376d7ad62b6a8e8dfff56b559d9d275e5b9b3a
- https://git.kernel.org/stable/c/67d1189d1095d471ed7fa426c7e384a7140a5dd7
- https://git.kernel.org/stable/c/712e2c8415f55a4a4ddaa98a430b87f624109f69
- https://git.kernel.org/stable/c/0b6f39c175ba5f0ef72bdb3b9d2a06ad78621d62
- https://git.kernel.org/stable/c/4d376d7ad62b6a8e8dfff56b559d9d275e5b9b3a
- https://git.kernel.org/stable/c/67d1189d1095d471ed7fa426c7e384a7140a5dd7
- https://git.kernel.org/stable/c/712e2c8415f55a4a4ddaa98a430b87f624109f69
