#VU93783 Incorrect calculation in Linux kernel - CVE-2020-29534

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Main Vulnerability Database Vulnerabilities #VU93783

#VU93783 Incorrect calculation in Linux kernel - CVE-2020-29534

Published: December 3, 2020 / Updated: June 2, 2021


Vulnerability identifier: #VU93783
Vulnerability risk: Low
CVSSv4.0: 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/E:U/U:Clear
CVE-ID: CVE-2020-29534
CWE-ID: CWE-682
Exploitation vector: Local access
Exploit availability: No public exploit available
Vulnerable software:
Linux kernel
Software vendor:
Linux Foundation

Description

The vulnerability allows a local user to execute arbitrary code.

The vulnerability exists due to incorrect calculation within the __put_task_struct() and copy_process() functions in kernel/fork.c, within the __io_cqring_fill_event(), io_dismantle_req(), io_req_free_batch_finish(), io_req_free_batch(), io_close_prep(), io_req_drop_files(), io_req_set_file(), io_init_req(), io_submit_sqes(), io_sq_thread(), io_uring_alloc_task_context(), io_sq_offload_start(), io_wq_files_match(), io_uring_cancel_files(), io_cancel_task_cb(), SYSCALL_DEFINE6() and io_uring_get_fd() functions in fs/io_uring.c, within the exit_files() function in fs/file.c, within the bprm_execve() function in fs/exec.c. A local user can execute arbitrary code.


Remediation

Install update from vendor's website.

External links