CVE-2022-50490

Summary

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

bpf: Propagate error from htab_lock_bucket() to userspace

In __htab_map_lookup_and_delete_batch() if htab_lock_bucket() returns -EBUSY, it will go to next bucket. Going to next bucket may not only skip the elements in current bucket silently, but also incur out-of-bound memory access or expose kernel memory to userspace if current bucket_cnt is greater than bucket_size or zero.

Fixing it by stopping batch operation and returning -EBUSY when htab_lock_bucket() fails, and the application can retry or skip the busy batch as needed.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux20b6cc34ea74b6a84599c1f8a70f3315b56a1883 < 0e13425104903970a5ede853082d3bbb4edec6f3affected
LinuxLinux20b6cc34ea74b6a84599c1f8a70f3315b56a1883 < 6bfee6eb3d6b96ae730a542909dd22b5f9f50d58affected
LinuxLinux20b6cc34ea74b6a84599c1f8a70f3315b56a1883 < 4f1f39a8f1ce1b24fee6852d7dcd704ce7c4334daffected
LinuxLinux20b6cc34ea74b6a84599c1f8a70f3315b56a1883 < 66a7a92e4d0d091e79148a4c6ec15d1da65f4280affected
LinuxLinux5.11affected
LinuxLinux0 < 5.11unaffected
LinuxLinux5.15.75 <= 5.15.*unaffected
LinuxLinux5.19.17 <= 5.19.*unaffected
LinuxLinux6.0.3 <= 6.0.*unaffected
LinuxLinux6.1 <= *unaffected

Weaknesses

References