Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: bpf, lsm: Add check for BPF LSM return value A bpf prog returning a positive number attached to file_alloc_security hook makes kernel panic. This happens because file system can not filter out the positive number returned by the LSM prog using IS_ERR, and misinterprets this positive number as a file pointer. Given that hook file_alloc_security never returned positive number before the introduction of BPF LSM, and other BPF LSM hooks may encounter similar issues, this patch adds LSM return value check in verifier, to ensure no unexpected value is returned.
CVSS Score
MEDIUM
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.7, < 6.10.13 |
References
- https://git.kernel.org/stable/c/1050727d83e70449991c29dd1cf29fe936a63da3Patch
- https://git.kernel.org/stable/c/27ca3e20fe80be85a92b10064dfeb56cb2564b1cPatch
- https://git.kernel.org/stable/c/5d99e198be279045e6ecefe220f5c52f8ce9bfd5Patch
FAQ
What is CVE-2024-47703?
CVE-2024-47703 is a vulnerability with a CVSS score of 5.5 (MEDIUM). In the Linux kernel, the following vulnerability has been resolved: bpf, lsm: Add check for BPF LSM return value A bpf prog returning a positive number attached to file_alloc_security hook makes ker...
How severe is CVE-2024-47703?
CVE-2024-47703 has been rated MEDIUM with a CVSS base score of 5.5/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2024-47703?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.