CVE-2018-3665: Infoleak
Published Jun 1, 2018
·Updated
An information leakage flaw is found in the way Linux kernel saves and restores Floating Point Unit(FPU) state during task switch. There are two ways, one is to save & restore FPU state during task context switch. And second is to defer FPU state save & restore until an FP instruction is invoked by the current task. First is called as "Eager FPU Restore" and second is known as "Lazy FPU Restore" scheme.
Linux kernel which follows the "Lazy FPU Restore" scheme is vulnerable to the FPU state information leakage issue. An unprivileged local attacker could use this flaw to read FPU state bits by conducting targeted cache side-channel attacks, similar to Meltdown attack disclosed earlier this year.
Upstream fix: ------------- -> https://git.kernel.org/linus//58122bf1d856a4ea9581d62a07c557d997d46a19
References: ----------- -> http://www.openwall.com/lists/oss-security/2018/06/13/7
Other sources
Kernel. Lazy FP state restore instead of eager save and restore of the state upon a context switch. Lazy restored states are potentially vulnerable to exploits where one process may infer register values of other processes through a speculative execution side channel that infers their value.
System software utilizing Lazy FP state restore technique on systems using Intel Core-based microprocessors may potentially allow a local process to infer data from another process through a speculative execution side channel.
— Launchpad
Credit
Julian Stecklina(Amazon Germany), Thomas Prescher(Cyberus Technology GmbH), Zdenek Sojka(SYSGO AG), Colin Percival
Affected Software
486 affected componentsFixes available
Apple macOS High Sierra<10.13.6
10.13.6
Apple Sierra
Apple El Capitan
Intel Core I3=330e
Intel Core I3=330m
Intel Core I3=330um
Intel Core I3=350m
Intel Core I3=370m
Intel Core I3=380m
Intel Core I3=380um
Intel Core I3=390m
Intel Core I3=530
Intel Core I3=540
Intel Core I3=550
Intel Core I3=560
Intel Core I3=2100
Intel Core I3=2100t
Intel Core I3=2102
Intel Core I3=2105
Intel Core I3=2115c
Intel Core I3=2120
Intel Core I3=2120t
Intel Core I3=2125
Intel Core I3=2130
Intel Core I3=2310e
Intel Core I3=2310m
Intel Core I3=2312m
Intel Core I3=2328m
Intel Core I3=2330e
Intel Core I3=2330m
Intel Core I3=2340ue
Intel Core I3=2348m
Intel Core I3=2350m
Intel Core I3=2357m
Intel Core I3=2365m
Intel Core I3=2367m
Intel Core I3=2370m
Intel Core I3=2375m
Intel Core I3=2377m
Intel Core I3=3110m
Intel Core I3=3115c
Intel Core I3=3120m
Intel Core I3=3120me
Intel Core I3=3130m
Intel Core I3=3210
Intel Core I3=3217u
Intel Core I3=3217ue
Intel Core I3=3220
Intel Core I3=3220t
Intel Core I3=3225
Intel Core I3=3227u
Intel Core I3=3229y
Intel Core I3=3240
Intel Core I3=3240t
Intel Core I3=3245
Intel Core I3=3250
Intel Core I3=3250t
Intel Core I3=4000m
Intel Core I3=4005u
Intel Core I3=4010u
Intel Core I3=4010y
Intel Core I3=4012y
Intel Core I3=4020y
Intel Core I3=4025u
Intel Core I3=4030u
Intel Core I3=4030y
Intel Core I3=4100e
Intel Core I3=4100m
Intel Core I3=4100u
Intel Core I3=4102e
Intel Core I3=4110e
Intel Core I3=4110m
Intel Core I3=4112e
Intel Core I3=4120u
Intel Core I3=4130
Intel Core I3=4130t
Intel Core I3=4150
Intel Core I3=4150t
Intel Core I3=4158u
Intel Core I3=4160
Intel Core I3=4160t
Intel Core I3=4170
Intel Core I3=4170t
Intel Core I3=4330
Intel Core I3=4330t
Intel Core I3=4330te
Intel Core I3=4340
Intel Core I3=4340te
Intel Core I3=4350
Intel Core I3=4350t
Intel Core I3=4360
Intel Core I3=4360t
Intel Core I3=4370
Intel Core I3=4370t
Intel Core I3=5005u
Intel Core I3=5010u
Intel Core I3=5015u
Intel Core I3=5020u
Intel Core I3=5157u
Intel Core I3=6006u
Intel Core I3=6098p
Intel Core I3=6100
Intel Core I3=6100e
Intel Core I3=6100h
Intel Core I3=6100t
Intel Core I3=6100te
Intel Core I3=6100u
Intel Core I3=6102e
Intel Core I3=6157u
Intel Core I3=6167u
Intel Core I3=6300
Intel Core I3=6300t
Intel Core I3=6320
Intel Core I3=8100
Intel Core I3=8350k
Intel Core I5=430m
Intel Core I5=430um
Intel Core I5=450m
Intel Core I5=460m
Intel Core I5=470um
Intel Core I5=480m
Intel Core I5=520e
Intel Core I5=520m
Intel Core I5=520um
Intel Core I5=540m
Intel Core I5=540um
Intel Core I5=560m
Intel Core I5=560um
Intel Core I5=580m
Intel Core I5=650
Intel Core I5=655k
Intel Core I5=660
Intel Core I5=661
Intel Core I5=670
Intel Core I5=680
Intel Core I5=750
Intel Core I5=750s
Intel Core I5=760
Intel Core I5=2300
Intel Core I5=2310
Intel Core I5=2320
Intel Core I5=2380p
Intel Core I5=2390t
Intel Core I5=2400
Intel Core I5=2400s
Intel Core I5=2405s
Intel Core I5=2410m
Intel Core I5=2430m
Intel Core I5=2435m
Intel Core I5=2450m
Intel Core I5=2450p
Intel Core I5=2467m
Intel Core I5=2500
Intel Core I5=2500k
Intel Core I5=2500s
Intel Core I5=2500t
Intel Core I5=2510e
Intel Core I5=2515e
Intel Core I5=2520m
Intel Core I5=2537m
Intel Core I5=2540m
Intel Core I5=2550k
Intel Core I5=2557m
Intel Core I5=3210m
Intel Core I5=3230m
Intel Core I5=3317u
Intel Core I5=3320m
Intel Core I5=3330
Intel Core I5=3330s
Intel Core I5=3337u
Intel Core I5=3339y
Intel Core I5=3340
Intel Core I5=3340m
Intel Core I5=3340s
Intel Core I5=3350p
Intel Core I5=3360m
Intel Core I5=3380m
Intel Core I5=3427u
Intel Core I5=3437u
Intel Core I5=3439y
Intel Core I5=3450
Intel Core I5=3450s
Intel Core I5=3470
Intel Core I5=3470s
Intel Core I5=3470t
Intel Core I5=3475s
Intel Core I5=3550
Intel Core I5=3550s
Intel Core I5=3570
Intel Core I5=3570k
Intel Core I5=3570s
Intel Core I5=3570t
Intel Core I5=3610me
Intel Core I5=4200h
Intel Core I5=4200m
Intel Core I5=4200u
Intel Core I5=4200y
Intel Core I5=4202y
Intel Core I5=4210h
Intel Core I5=4210m
Intel Core I5=4210u
Intel Core I5=4210y
Intel Core I5=4220y
Intel Core I5=4250u
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Intel Core I5=4260u
Intel Core I5=4278u
Intel Core I5=4288u
Intel Core I5=4300m
Intel Core I5=4300u
Intel Core I5=4300y
Intel Core I5=4302y
Intel Core I5=4308u
Intel Core I5=4310m
Intel Core I5=4310u
Intel Core I5=4330m
Intel Core I5=4340m
Intel Core I5=4350u
Intel Core I5=4360u
Intel Core I5=4400e
Intel Core I5=4402e
Intel Core I5=4402ec
Intel Core I5=4410e
Intel Core I5=4422e
Intel Core I5=4430
Intel Core I5=4430s
Intel Core I5=4440
Intel Core I5=4440s
Intel Core I5=4460
Intel Core I5=4460s
Intel Core I5=4460t
Intel Core I5=4570
Intel Core I5=4570r
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Intel Core I5=4570t
Intel Core I5=4570te
Intel Core I5=4590
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Intel Core I5=4590t
Intel Core I5=4670
Intel Core I5=4670k
Intel Core I5=4670r
Intel Core I5=4670s
Intel Core I5=4670t
Intel Core I5=4690
Intel Core I5=4690k
Intel Core I5=4690s
Intel Core I5=4690t
Intel Core I5=5200u
Intel Core I5=5250u
Intel Core I5=5257u
Intel Core I5=5287u
Intel Core I5=5300u
Intel Core I5=5350h
Intel Core I5=5350u
Intel Core I5=5575r
Intel Core I5=5675c
Intel Core I5=5675r
Intel Core I5=6200u
Intel Core I5=6260u
Intel Core I5=6267u
Intel Core I5=6287u
Intel Core I5=6300hq
Intel Core I5=6300u
Intel Core I5=6350hq
Intel Core I5=6360u
Intel Core I5=6400
Intel Core I5=6400t
Intel Core I5=6402p
Intel Core I5=6440eq
Intel Core I5=6440hq
Intel Core I5=6442eq
Intel Core I5=6500
Intel Core I5=6500t
Intel Core I5=6500te
Intel Core I5=6585r
Intel Core I5=6600
Intel Core I5=6600k
Intel Core I5=6600t
Intel Core I5=6685r
Intel Core I5=8250u
Intel Core I5=8350u
Intel Core I5=8400
Intel Core I5=8600k
Intel Core I7=7y75
Intel Core I7=610e
Intel Core I7=620le
Intel Core I7=620lm
Intel Core I7=620m
Intel Core I7=620ue
Intel Core I7=620um
Intel Core I7=640lm
Intel Core I7=640m
Intel Core I7=640um
Intel Core I7=660lm
Intel Core I7=660ue
Intel Core I7=660um
Intel Core I7=680um
Intel Core I7=720qm
Intel Core I7=740qm
Intel Core I7=820qm
Intel Core I7=840qm
Intel Core I7=860
Intel Core I7=860s
Intel Core I7=870
Intel Core I7=870s
Intel Core I7=875k
Intel Core I7=880
Intel Core I7=920
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Intel Core I7=940
Intel Core I7=940xm
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Intel Core I7=965
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Intel Core I7=975
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Intel Core I7=980x
Intel Core I7=990x
Intel Core I7=2600
Intel Core I7=2600k
Intel Core I7=2600s
Intel Core I7=2610ue
Intel Core I7=2617m
Intel Core I7=2620m
Intel Core I7=2629m
Intel Core I7=2630qm
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Intel Core I7=2637m
Intel Core I7=2640m
Intel Core I7=2649m
Intel Core I7=2655le
Intel Core I7=2657m
Intel Core I7=2670qm
Intel Core I7=2675qm
Intel Core I7=2677m
Intel Core I7=2700k
Intel Core I7=2710qe
Intel Core I7=2715qe
Intel Core I7=2720qm
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Intel Core I7=2820qm
Intel Core I7=2860qm
Intel Core I7=2920xm
Intel Core I7=2960xm
Intel Core I7=3517u
Intel Core I7=3517ue
Intel Core I7=3520m
Intel Core I7=3537u
Intel Core I7=3540m
Intel Core I7=3555le
Intel Core I7=3610qe
Intel Core I7=3610qm
Intel Core I7=3612qe
Intel Core I7=3612qm
Intel Core I7=3615qe
Intel Core I7=3615qm
Intel Core I7=3630qm
Intel Core I7=3632qm
Intel Core I7=3635qm
Intel Core I7=3667u
Intel Core I7=3687u
Intel Core I7=3689y
Intel Core I7=3720qm
Intel Core I7=3740qm
Intel Core I7=3770
Intel Core I7=3770k
Intel Core I7=3770s
Intel Core I7=3770t
Intel Core I7=3820qm
Intel Core I7=3840qm
Intel Core I7=4500u
Intel Core I7=4510u
Intel Core I7=4550u
Intel Core I7=4558u
Intel Core I7=4578u
Intel Core I7=4600m
Intel Core I7=4600u
Intel Core I7=4610m
Intel Core I7=4610y
Intel Core I7=4650u
Intel Core I7=4700ec
Intel Core I7=4700eq
Intel Core I7=4700hq
Intel Core I7=4700mq
Intel Core I7=4702ec
Intel Core I7=4702hq
Intel Core I7=4702mq
Intel Core I7=4710hq
Intel Core I7=4710mq
Intel Core I7=4712hq
Intel Core I7=4712mq
Intel Core I7=4720hq
Intel Core I7=4722hq
Intel Core I7=4750hq
Intel Core I7=4760hq
Intel Core I7=4765t
Intel Core I7=4770
Intel Core I7=4770hq
Intel Core I7=4770k
Intel Core I7=4770r
Intel Core I7=4770s
Intel Core I7=4770t
Intel Core I7=4770te
Intel Core I7=4771
Intel Core I7=4785t
Intel Core I7=4790
Intel Core I7=4790k
Intel Core I7=4790s
Intel Core I7=4790t
Intel Core I7=4800mq
Intel Core I7=4810mq
Intel Core I7=4850hq
Intel Core I7=4860hq
Intel Core I7=4870hq
Intel Core I7=4900mq
Intel Core I7=4910mq
Intel Core I7=4950hq
Intel Core I7=4960hq
Intel Core I7=4980hq
Intel Core I7=5500u
Intel Core I7=5550u
Intel Core I7=5557u
Intel Core I7=5600u
Intel Core I7=5650u
Intel Core I7=5700eq
Intel Core I7=5700hq
Intel Core I7=5750hq
Intel Core I7=5775c
Intel Core I7=5775r
Intel Core I7=5850eq
Intel Core I7=5850hq
Intel Core I7=5950hq
Intel Core I7=7500u
Intel Core I7=7560u
Intel Core I7=7567u
Intel Core I7=7600u
Intel Core I7=7660u
Intel Core I7=7700
Intel Core I7=7700hq
Intel Core I7=7700k
Intel Core I7=7700t
Intel Core I7=7820eq
Intel Core I7=7820hk
Intel Core I7=7820hq
Intel Core I7=7920hq
Intel Core I7=8550u
Intel Core I7=8650u
Intel Core I7=8700
Intel Core I7=8700k
Intel Core M=5y10
Intel Core M=5y10a
Intel Core M=5y10c
Intel Core M=5y31
Intel Core M=5y51
Intel Core M=5y70
Intel Core M=5y71
Intel Core M3=6y30
Intel Core M3=7y30
Intel Core M3=7y32
Intel Core M5=6y54
Intel Core M5=6y57
Intel Core M7=6y75
Citrix XenServer=7.0
Citrix XenServer=7.1
Citrix XenServer=7.3
Citrix XenServer=7.4
Citrix XenServer=7.5
Canonical Ubuntu Linux=12.04
Canonical Ubuntu Linux=14.04
Canonical Ubuntu Linux=16.04
Debian Debian Linux=8.0
Debian Debian Linux=9.0
FreeBSD FreeBSD=11.0
FreeBSD FreeBSD=11.1
FreeBSD FreeBSD=11.2
redhat Enterprise Linux=6.0
redhat Enterprise Linux=7.0
redhat Enterprise Linux Desktop=6.0
redhat Enterprise Linux Desktop=7.0
redhat Enterprise Linux Workstation=6.0
redhat Enterprise Linux Workstation=7.0
debian/linux
5.10.223-15.10.257-16.1.170-36.1.174-16.12.86-16.12.90-27.0.10-17.0.12-2
debian/xen
4.14.6-14.14.5+94-ge49571868d-14.17.5+72-g01140da4e8-14.20.2+37-g61ff35323e-0+deb13u14.20.2+7-g1badcf5035-0+deb13u14.20.2+37-g61ff35323e-1
Remediation
Event History
Jun 1, 2018
Data Sourced
via Red Hat·06:52 AM
DescriptionSeverityAffected Software
Jun 21, 2018
CVE Published
via MITRE·08:00 PM
Data Sourced
via MITRE·08:00 PM
DescriptionWeakness
Jan 11, 2024
Data Sourced
via Launchpad·11:02 PM
Description
Sep 27, 2025
Data Sourced
via Ubuntu·04:14 AM
RemedyDescriptionSeverityAffected Software
Jun 13, 2026
Data Sourced
via Debian·10:45 AM
DescriptionAffected Software
Peer vulnerabilities
Found alongside the following vulnerabilities.
- CVE-2018-4470
- CVE-2018-4289
- CVE-2018-4268
- CVE-2018-4285
- CVE-2018-5383
- CVE-2018-4293
- CVE-2018-4269
- CVE-2018-4276
- CVE-2018-4178
- CVE-2018-4456
- CVE-2018-4283
- CVE-2018-3665
- CVE-2018-4259
- CVE-2018-4286
- CVE-2018-4287
- CVE-2018-4288
- CVE-2018-4291
- CVE-2018-4280
- CVE-2018-4248
- CVE-2018-4277
- CVE-2018-6797
- CVE-2018-6913
- CVE-2017-0898
- CVE-2017-10784
- CVE-2017-14033
- CVE-2017-14064
- CVE-2017-17405
- CVE-2017-17742
- CVE-2018-6914
- CVE-2018-8777
- CVE-2018-8778
- CVE-2018-8779
- CVE-2018-8780
- CVE-2018-4274
Frequently Asked Questions
1
What is CVE-2018-3665?
CVE-2018-3665 is a vulnerability in system software utilizing Lazy FP state restore technique on systems using Intel Core-based microprocessors.
2
What is the impact of CVE-2018-3665?
CVE-2018-3665 may allow a local process to infer data from another process through a speculative execution side channel.
3
Which systems are affected by CVE-2018-3665?
Systems using Intel Core-based microprocessors may be affected by CVE-2018-3665.
4
How severe is CVE-2018-3665?
CVE-2018-3665 has a severity rating of medium (4 out of 10).
5
Are there any remedies available for CVE-2018-3665?
Yes, there are remedial actions available for CVE-2018-3665. Please refer to the provided references for more information.