CVE-2022-50226

Summary

In the Linux kernel, the following vulnerability has been resolved:

crypto: ccp - Use kzalloc for sev ioctl interfaces to prevent kernel memory leak

For some sev ioctl interfaces, input may be passed that is 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 buffer, the sev ioctl interfaces with the issue may return uninitialized slab memory.

Currently, all of the ioctl interfaces in the ccp driver are safe, but to prevent future problems, change all ioctl interfaces that allocate memory with kmalloc to use kzalloc and memset the data buffer to zero in sev_ioctl_do_platform_status.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxe799035609e1526761aa2f896a974b233d04d36d < 4c5300f6f5e18b11c02a92f136e69b98fddba15eaffected
LinuxLinuxe799035609e1526761aa2f896a974b233d04d36d < f2a920daa780956b987c14b9f23de7c3c8915bf2affected
LinuxLinuxe799035609e1526761aa2f896a974b233d04d36d < caa395aa16e7c9193fd7fa6cde462dd8229d4953affected
LinuxLinuxe799035609e1526761aa2f896a974b233d04d36d < e11fb0a3a39bb42da35fa662c46ce7391f277436affected
LinuxLinuxe799035609e1526761aa2f896a974b233d04d36d < 13dc15a3f5fd7f884e4bfa8c011a0ae868df12aeaffected
LinuxLinux4.16affected
LinuxLinux0 < 4.16unaffected
LinuxLinux5.10.173 <= 5.10.*unaffected
LinuxLinux5.15.61 <= 5.15.*unaffected
LinuxLinux5.18.18 <= 5.18.*unaffected
LinuxLinux5.19.2 <= 5.19.*unaffected
LinuxLinux6.0 <= *unaffected

Weaknesses

References