CVE-2024-58087
📋 TL;DR
A race condition vulnerability in the Linux kernel's ksmbd (SMB server) component allows attackers to potentially cause denial of service or gain unauthorized access to SMB sessions. This affects Linux systems running ksmbd with SMB file sharing enabled. The vulnerability occurs when session lookup and expiration operations happen concurrently without proper locking.
💻 Affected Systems
- Linux kernel with ksmbd 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 →⚠️ Risk & Real-World Impact
Worst Case
Attackers could crash the ksmbd service, cause kernel panics, or potentially gain unauthorized access to SMB sessions and file shares.
Likely Case
Denial of service through ksmbd service crashes or instability in SMB file sharing operations.
If Mitigated
Minimal impact if proper network segmentation and access controls limit SMB exposure.
🎯 Exploit Status
Requires race condition timing and SMB access. No public exploit available at CVE publication.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel with commit 2107ab40629aeabbec369cf34b8cf0f288c3eb1b or later
Vendor Advisory: https://git.kernel.org/stable/c/2107ab40629aeabbec369cf34b8cf0f288c3eb1b
Restart Required: Yes
Instructions:
1. Update Linux kernel to patched version. 2. Reboot system. 3. Verify ksmbd module loads with patched kernel.
🔧 Temporary Workarounds
Disable ksmbd module
LinuxTemporarily disable the vulnerable ksmbd SMB server module
sudo modprobe -r ksmbd
echo 'blacklist ksmbd' | sudo tee /etc/modprobe.d/ksmbd-blacklist.conf
Restrict SMB network access
LinuxUse firewall rules to limit SMB access to trusted networks only
sudo iptables -A INPUT -p tcp --dport 445 -s TRUSTED_NETWORK -j ACCEPT
sudo iptables -A INPUT -p tcp --dport 445 -j DROP
🧯 If You Can't Patch
- Disable ksmbd service and use alternative SMB implementations like Samba
- Implement strict network segmentation to isolate SMB services from untrusted networks
🔍 How to Verify
Check if Vulnerable:
Check if ksmbd module is loaded: lsmod | grep ksmbd. If loaded and kernel version is unpatched, system is vulnerable.Check Version:
uname -rVerify Fix Applied:
Verify kernel version includes fix commit: grep -q '2107ab40629aeabbec369cf34b8cf0f288c3eb1b' /proc/version || echo 'Check kernel source'📡 Detection & Monitoring
Log Indicators:
- Kernel panic logs
- ksmbd service crashes in system logs
- Unexpected SMB session terminations
Network Indicators:
- Multiple rapid SMB connection attempts
- Abnormal SMB protocol patterns
SIEM Query:
source="kernel" AND ("panic" OR "Oops") OR source="ksmbd" AND ("crash" OR "segfault")🔗 References
- https://git.kernel.org/stable/c/2107ab40629aeabbec369cf34b8cf0f288c3eb1b
- https://git.kernel.org/stable/c/37a0e2b362b3150317fb6e2139de67b1e29ae5ff
- https://git.kernel.org/stable/c/450a844c045ff0895d41b05a1cbe8febd1acfcfd
- https://git.kernel.org/stable/c/a39e31e22a535d47b14656a7d6a893c7f6cf758c
- https://git.kernel.org/stable/c/b95629435b84b9ecc0c765995204a4d8a913ed52
- https://www.zerodayinitiative.com/advisories/ZDI-25-100/
