In the Linux kernel, the following vulnerability has been resolved:
cxl/features: Reject Get Feature count larger than the output buffer
cxlctl_get_feature() sizes its output buffer from the user's
fwctl_rpc.out_len, but the device is told to write
cxl_mbox_get_feat_in.count bytes into rpc_out->payload, which is a
separate user-controlled value. Nothing bounds count against out_len, so
a small out_len with a large count overflows the kvzalloc()'d buffer. A heap OOB write reachable from FWCTL_RPC.
Reject requests where count exceeds the available payload room, before allocating.
Attack Parameters
Attack Vector
Local
Requires local access
Attack Complexity
Low
Easy to exploit
Privileges Required
Low
Basic privileges needed
User Interaction
None
No user interaction needed
Impact Assessment
Confidentiality
High
Complete data leak
Integrity
High
Complete data modification
Availability
High
Complete denial of service
CVSS Vector v3.1
References 3
https://git.kernel.org/stable/c/329ea475581c647a680a6937e353c1a6e2534b40
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/3f02031a0a53de0d3ef066c92d0486b2b11be40c
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/4bf6bac375076ced2fa4b3fef8739bd985f93456
416baaa9-dc9f-4396-8d5f-8c081fb06d67