SB2018122043 - Ubuntu update for linux, linux-aws, linux-kvm and more
Published: December 20, 2018 Updated: October 31, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 vulnerabilities.
1) Double free error (CVE-ID: CVE-2017-18174)
CWE-ID: CWE-415 - Double Free
CVSSv4: 6.9 [CVSS:4.0/AV:L/AC:L/AT:N/PR:N/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local attacker to cause DoS condition on the target system.
The weakness exists in the amd_gpio_remove function due to double free when calling the pinctrl_unregister function. A local attacker can trigger memory corruption and cause the service to crash.
2) Integer overflow (CVE-ID: CVE-2018-12896)
CWE-ID: CWE-190 - Integer overflow
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local user to perform a denial of service (DoS) attack.
An issue was discovered in the Linux kernel through 4.17.3. An Integer Overflow in kernel/time/posix-timers.c in the POSIX timer code is caused by the way the overrun accounting works. Depending on interval and expiry time values, the overrun can be larger than INT_MAX, but the accounting is int based. This basically makes the accounting values, which are visible to user space via timer_getoverrun(2) and siginfo::si_overrun, random. For example, a local user can cause a denial of service (signed integer overflow) via crafted mmap, futex, timer_create, and timer_settime system calls.
3) Improper input validation (CVE-ID: CVE-2018-18690)
CWE-ID: CWE-20 - Improper input validation
CVSSv4: 6.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:N/VI:N/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local attacker to cause DoS condition on the target system.
The vulnerability exists due to improper handling of ATTR_REPLACE operations by the xfs_attr_shortform_addname function, as defined in the fs/xfs/libxfs/xfs_attr.c source code file. A local attacker can access the system and execute an application that submits malicious input, trigger corruption of the Extended File System (XFS) and cause the service to crash.
4) Information disclosure (CVE-ID: CVE-2018-18710)
CWE-ID: CWE-200 - Exposure of sensitive information to an unauthorized actor
CVSSv4: 4.8 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:L/VI:N/VA:N/SC:N/SI:N/SA:N]
The vulnerability allows a remote attacker to obtain potentially sensitive information.
The vulnerability exists in the cdrom_ioctl_select_disc function, as defined in the drivers/cdrom/cdrom.c source code file due to boundary error when processing of user-supplied input. A local attacker can access the system, execute an application that submits malicious input to read arbitrary kernel memory on the system, which could be used to conduct additional attacks.
Remediation
Install update from vendor's website.