Information disclosure in Linux Kernel
| Risk | Low |
| Patch available | YES |
| Number of vulnerabilities | 2 |
| CVE-ID | CVE-2018-3665 CVE-2018-10940 |
| CWE-ID | CWE-200 |
| Exploitation vector | Local |
| Public exploit | N/A |
| Vulnerable software Subscribe |
Intel Core M 32nm Hardware solutions / Firmware Intel Core M 45nm Hardware solutions / Firmware Intel Core i7 32nm Hardware solutions / Firmware Intel Core i7 45nm Hardware solutions / Firmware Intel Core i5 32nm Hardware solutions / Firmware Intel Core i5 45nm Hardware solutions / Firmware Intel Core i3 32nm Hardware solutions / Firmware Intel Core i3 45nm Hardware solutions / Firmware Linux kernel Operating systems & Components / Operating system |
| Vendor |
Intel Linux Foundation |
Security Bulletin
This security bulletin contains information about 2 vulnerabilities.
1) Side-channel attack
EUVDB-ID: #VU13337
Risk: Low
CVSSv3.1: 4.8 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2018-3665
CWE-ID:
CWE-200 - Information exposure
Exploit availability: No
DescriptionThe vulnerability allows a local attacker to obtain potentially sensitive information.
The vulnerability exists due to utilizing the Lazy FP state restore technique for floating point state when context switching between application processes. A local attacker can conduct cache side-channel attacks and determine register values of other processes.
Note: This vulnerability is known as LazyFP.
MitigationInstall update from vendor's website.
Vulnerable software versionsIntel Core M 32nm: All versions
Intel Core M 45nm: All versions
Intel Core i7 32nm: All versions
Intel Core i7 45nm: All versions
Intel Core i5 32nm: All versions
Intel Core i5 45nm: All versions
Intel Core i3 32nm: All versions
Intel Core i3 45nm: All versions
External linksQ & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
2) Information disclosure
EUVDB-ID: #VU13363
Risk: Low
CVSSv3.1: 2.9 [CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:L/I:N/A:N/E:U/RL:O/RC:C]
CVE-ID: CVE-2018-10940
CWE-ID:
CWE-200 - Information exposure
Exploit availability: No
DescriptionThe vulnerability allows a local attacker to obtain potentially sensitive information.
The vulnerability exists in the cdrom_ioctl_media_changed function due to incorrect bounds check in the CDROM driver CDROM_MEDIA_CHANGED IOCTL. A local attacker can execute a file or program that submits malicious input to the targeted system, trigger memory corruption and access sensitive kernel information, which could be used to conduct further attacks.
MitigationUpdate to version 4.16.6.
Linux kernel: 4.0 - 4.19.2
External linkshttp://github.com/torvalds/linux/commit/9de4ee40547fd315d4a0ed1dd15a2fa3559ad707
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.20
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.138
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.164
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.3
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.18.20
http://www.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.82
Q & A
Can this vulnerability be exploited remotely?
No. This vulnerability can be exploited locally. The attacker should have authentication credentials and successfully authenticate on the system.
Is there known malware, which exploits this vulnerability?
No. We are not aware of malware exploiting this vulnerability.
