SB2020070616 - Ubuntu update for linux
Published: July 6, 2020 Updated: April 23, 2025
Breakdown by Severity
- Low
- Medium
- High
- Critical
Description
This security bulletin contains information about 4 secuirty vulnerabilities.
1) Use of uninitialized resource (CVE-ID: CVE-2020-10732)
The vulnerability allows a local user to read memory contents or crash the application.
The vulnerability exists due to use of uninitialized resource error within the fill_thread_core_info() function in fs/binfmt_elf.c. A local user can read memory contents or crash the application.
2) NULL pointer dereference (CVE-ID: CVE-2020-10711)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a NULL pointer dereference error in the Linux kernel's SELinux subsystem when importing the Commercial IP Security Option (CIPSO) protocol's category bitmap into the SELinux extensible bitmap via the' ebitmap_netlbl_import' routine. While processing the CIPSO restricted bitmap tag in the 'cipso_v4_parsetag_rbm' routine, it sets the security attribute to indicate that the category bitmap is present, even if it has not been allocated.
A remote attacker can send specially crafted packets the affected system, trigger a NULL pointer dereference error and crash the Linux kernel.
3) Input validation error (CVE-ID: CVE-2020-12770)
The vulnerability allows a local user to execute arbitrary code on the system.
The vulnerability exists due to the "sg_write" lacks an "sg_remove_request" call in a certain failure case. A local user can pass specially crafted input to the application and execute arbitrary code on the target system.
4) Out-of-bounds read (CVE-ID: CVE-2020-13143)
The vulnerability allows a remote attacker to perform a denial of service (DoS) attack.
The vulnerability exists due to a boundary condition in "gadget_dev_desc_UDC_store" in "drivers/usb/gadget/configfs.c" file. A remote attacker can trigger out-of-bounds read error and cause a denial of service on the target system.
Remediation
Install update from vendor's website.