Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak For some sev ioctl interfaces, the length parameter that is passed maybe less than or equal to SEV_FW_BLOB_MAX_SIZE, but larger than the data that PSP firmware returns. In this case, kmalloc will allocate memory that is the size of the input rather than the size of the data. Since PSP firmware doesn't fully overwrite the allocated buffer, these sev ioctl interface may return uninitialized kernel slab memory.
CVSS Score
HIGH
Affected Products
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux Kernel | >= 5.7, < 5.10.124 |
References
- https://git.kernel.org/stable/c/401bef1f95de92c3a8c6eece46e02fa88d7285eePatch
- https://git.kernel.org/stable/c/57a01725339f9d82b099102ba2751621b1caab93Patch
- https://git.kernel.org/stable/c/bbdcc644b59e01e98c68894a9fab42b9687f42b0Patch
- https://git.kernel.org/stable/c/d22d2474e3953996f03528b84b7f52cc26a39403Patch
- https://git.kernel.org/stable/c/d8fdb4b24097472ff6b3c0559448200d420b1418Patch
FAQ
What is CVE-2022-49556?
CVE-2022-49556 is a vulnerability with a CVSS score of 7.1 (HIGH). In the Linux kernel, the following vulnerability has been resolved: KVM: SVM: Use kzalloc for sev ioctl interfaces to prevent kernel data leak For some sev ioctl interfaces, the length parameter tha...
How severe is CVE-2022-49556?
CVE-2022-49556 has been rated HIGH with a CVSS base score of 7.1/10. Review the CVSS metrics above for detailed severity breakdown.
Is there a patch for CVE-2022-49556?
Check the references section above for vendor advisories and patch information. Affected products include: Linux Linux Kernel.