In the Linux kernel, the following vulnerability has been resolved:
bpf, x86: Fix trampoline stack size for 128-bit arguments
btf_distill_func_proto() accepts a function argument up to 16 bytes, so a
128-bit scalar such as __int128 reaches the x86 trampoline with
arg_size == 16. But the current implementation assumes an __int128
argument only needs one register, so the register save area is
under-allocated and save_args() overwrites adjacent stack slots.
Compute the register count from arg_size for all arguments to fix it.
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 4
https://git.kernel.org/stable/c/40f3bfbbb222b92278f3797614b70f68d46824ac
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/4aed2346fa9b88d458eeb8c01123f3c07585a675
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/814cba835ef648e0c5eb79505c96c0493b29eea6
416baaa9-dc9f-4396-8d5f-8c081fb06d67
https://git.kernel.org/stable/c/a6d7d7a253c550e74b0651897fe313c2f9b2301f
416baaa9-dc9f-4396-8d5f-8c081fb06d67