linux-libre 4.16 still vulnerable to CVE-2017-5715 aka Spectre Variant 2

Hi to all i just installed to test fresh linux-libre kernel on a old core2duo cpu and found linux-libre is still vulnerable to CVE-2017-5715 aka Spectre Variant 2.

Spectre and Meltdown mitigation detection tool v0.36+

Checking for vulnerabilities on current system
Kernel is Linux 4.16.0-gnu #1 SMP Mon Apr 2 00:58:20 UTC 2018 x86_64
CPU is Intel(R) Core(TM)2 Duo CPU E8400 @ 3.00GHz

Hardware check
* Hardware support (CPU microcode) for mitigation techniques
* Indirect Branch Restricted Speculation (IBRS)
* SPEC_CTRL MSR is available: NO
* CPU indicates IBRS capability: NO
* Indirect Branch Prediction Barrier (IBPB)
* PRED_CMD MSR is available: NO
* CPU indicates IBPB capability: NO
* Single Thread Indirect Branch Predictors (STIBP)
* SPEC_CTRL MSR is available: NO
* CPU indicates STIBP capability: NO
* Enhanced IBRS (IBRS_ALL)
* CPU indicates ARCH_CAPABILITIES MSR availability: NO
* ARCH_CAPABILITIES MSR advertises IBRS_ALL capability: NO
* CPU explicitly indicates not being vulnerable to Meltdown (RDCL_NO): NO
* CPU microcode is known to cause stability problems: NO (model 23 stepping 10 ucode 0xa07)
* CPU vulnerability to the three speculative execution attack variants
* Vulnerable to Variant 1: YES
* Vulnerable to Variant 2: YES
* Vulnerable to Variant 3: YES

CVE-2017-5753 [bounds check bypass] aka 'Spectre Variant 1'
* Mitigated according to the /sys interface: YES (kernel confirms that the mitigation is active)
* Kernel has array_index_mask_nospec (x86): YES (1 occurence(s) found of 64 bits array_index_mask_nospec())
* Kernel has the Red Hat/Ubuntu patch: NO
* Kernel has mask_nospec64 (arm): NO
> STATUS: NOT VULNERABLE (Mitigation: __user pointer sanitization)

CVE-2017-5715 [branch target injection] aka 'Spectre Variant 2'
* Mitigated according to the /sys interface: NO (kernel confirms your system is vulnerable)
* Mitigation 1
* Kernel is compiled with IBRS/IBPB support: YES
* Currently enabled features
* IBRS enabled for Kernel space: UNKNOWN
* IBRS enabled for User space: UNKNOWN
* IBPB enabled: UNKNOWN
* Mitigation 2
* Kernel has branch predictor hardening (arm): NO
* Kernel compiled with retpoline option: YES
* Kernel compiled with a retpoline-aware compiler: NO (kernel reports minimal retpoline compilation)
> STATUS: VULNERABLE (Vulnerable: Minimal generic ASM retpoline)

CVE-2017-5754 [rogue data cache load] aka 'Meltdown' aka 'Variant 3'
* Mitigated according to the /sys interface: YES (kernel confirms that the mitigation is active)
* Kernel supports Page Table Isolation (PTI): YES (found 'CONFIG_PAGE_TABLE_ISOLATION=y')
* PTI enabled and active: YES
* Running as a Xen PV DomU: NO
> STATUS: NOT VULNERABLE (Mitigation: PTI)