CVE-2024-25743
📋 TL;DR
This vulnerability allows an untrusted hypervisor to inject virtual interrupts 0 and 14 at any time, triggering SIGFPE signal handlers in userspace applications on AMD SEV-SNP and AMD SEV-ES platforms. This affects Linux kernel versions through 6.9. The attack requires hypervisor-level access to the virtualization environment.
💻 Affected Systems
- Linux kernel
⚠️ Manual Verification Required
This CVE does not have specific version information in our database, so automatic vulnerability detection cannot determine if your system is affected.
Why? The CVE database entry doesn't specify which versions are vulnerable (no version ranges provided by the vendor/NVD).
🔒 Custom verification scripts are available for registered users. Sign up free to download automated test scripts.
- Review the CVE details at NVD
- Check vendor security advisories for your specific version
- Test if the vulnerability is exploitable in your environment
- Consider updating to the latest version as a precaution
⚠️ Risk & Real-World Impact
Worst Case
An attacker with hypervisor control could crash userspace applications by forcing SIGFPE signals, potentially causing denial of service or data corruption in critical applications.
Likely Case
Hypervisor-level attackers could disrupt specific applications by forcing floating-point exceptions, leading to application crashes or unexpected behavior.
If Mitigated
With proper hypervisor security controls and isolation, the risk is limited to controlled virtualization environments where hypervisor compromise is prevented.
🎯 Exploit Status
Exploitation requires hypervisor-level access to the virtualization environment, making it a targeted attack rather than a widespread threat.
🛠️ Fix & Mitigation
✅ Official Fix
Patch Version: Linux kernel 6.9+ with specific patches applied
Vendor Advisory: https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3008.html
Restart Required: Yes
Instructions:
1. Update Linux kernel to version 6.9 or later with patches from your distribution vendor. 2. For Red Hat systems: Apply kernel updates via 'yum update kernel'. 3. For SUSE systems: Apply kernel updates via 'zypper update kernel'. 4. Reboot the system after patching.
🔧 Temporary Workarounds
Disable AMD SEV-SNP/SEV-ES
linuxDisable AMD SEV-SNP or SEV-ES features if not required, removing the vulnerable component entirely.
Modify kernel boot parameters to disable SEV features: add 'sev=off' to GRUB_CMDLINE_LINUX in /etc/default/grub
Run 'update-grub' (or equivalent) and reboot
🧯 If You Can't Patch
- Implement strict hypervisor security controls and monitoring to prevent hypervisor compromise
- Isolate critical applications from virtualized environments using AMD SEV-SNP/SEV-ES
🔍 How to Verify
Check if Vulnerable:
Check kernel version with 'uname -r' and verify if SEV-SNP/SEV-ES is enabled via 'cat /proc/cpuinfo | grep sev' or 'dmesg | grep -i sev'Check Version:
uname -rVerify Fix Applied:
Verify kernel version is 6.9+ with patches and check that SEV features are either disabled or patched via vendor-specific security advisories📡 Detection & Monitoring
Log Indicators:
- Unexpected SIGFPE signals in application logs
- Kernel messages related to SEV/SEV-SNP/SEV-ES
- Application crashes with floating-point exceptions
Network Indicators:
- None - this is a local hypervisor-level attack
SIEM Query:
Search for 'SIGFPE' in application logs combined with virtualization platform events🔗 References
- https://bugzilla.redhat.com/show_bug.cgi?id=2270836
- https://bugzilla.suse.com/show_bug.cgi?id=1223307
- https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3008.html
- https://bugzilla.redhat.com/show_bug.cgi?id=2270836
- https://bugzilla.suse.com/show_bug.cgi?id=1223307
- https://www.amd.com/en/resources/product-security/bulletin/amd-sb-3008.html
