SB2018122044 - Ubuntu update for linux, linux-aws, linux-azure and more
Published: December 20, 2018 Updated: October 31, 2026
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 7 vulnerabilities.
1) Double-free memory error (CVE-ID: CVE-2018-10902)
CWE-ID: CWE-415 - Double Free
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local attacker to gain elevated privileges on the target system.
The vulnerability exists due to double-free memory error in snd_rawmidi_input_params() and snd_rawmidi_output_status() in 'rawmidi.c'. A local attacker can gain elevated privileges and execute arbitrary code.
Successful exploitation of this vulnerability may result in complete compromise of vulnerable system.
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) Use-after-free error (CVE-ID: CVE-2018-14734)
CWE-ID: CWE-416 - Use After Free
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 the ucma_leave_multicast() function, as defined in the drivers/infiniband/core/ucma.c source code file of the affected software, could allow access to a certain data structure after it has been allocated and freed in the ucma_process_join() function. A local attacker can send a specially request that submits malicious input, trigger use-after-free error and cause the service to crash.
4) Memory corruption (CVE-ID: CVE-2018-16276)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local attacker to gain elevated privileges on the target system.
The vulnerability exists due to an out-of-bounds access condition in the yurex_read function, as defined in the drivers/usb/misc/yurex.c source code file. A remote unauthenticated attacker can execute a specially crafted program that submits malicious, trigger memory corruption and gain elevated privileges or cause the service to crash.
5) Memory corruption (CVE-ID: CVE-2018-18445)
CWE-ID: CWE-119 - Memory corruption
CVSSv4: 8.5 [CVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N]
The vulnerability allows a local attacker to gain elevated privileges on the target system.
The vulnerability exists in the adjust_scalar_min_max_vals function, as defined in the kernel/bpf/verifier.c source code file due to boundary error in the BPF verifier. A local attacker can trigger the BPF verifier to mishandle 32-bit right shifts and cause an out-of-bounds memory access condition to access sensitive information, escalate privileges, or cause a DoS condition on the targeted system.
6) 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.
7) 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.