#VU92900 Out-of-bounds read in Linux kernel - CVE-2021-4439
Published: June 20, 2024 / Updated: May 13, 2025
Vulnerability identifier: #VU92900
Vulnerability risk: Low
CVSSv4.0: 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/E:U/U:Clear
CVE-ID: CVE-2021-4439
CWE-ID: CWE-125
Exploitation vector: Local access
Exploit availability:
No public exploit available
Vulnerable software:
Linux kernel
Linux kernel
Software vendor:
Linux Foundation
Linux Foundation
Description
The vulnerability allows a local user to perform a denial of service (DoS) attack.
The vulnerability exists due to an out-of-bounds read error within the detach_capi_ctr() function in drivers/isdn/capi/kcapi.c. A local user can perform a denial of service (DoS) attack.
Remediation
Install update from vendor's website.
External links
- https://git.kernel.org/stable/c/e8b8de17e164c9f1b7777f1c6f99d05539000036
- https://git.kernel.org/stable/c/24219a977bfe3d658687e45615c70998acdbac5a
- https://git.kernel.org/stable/c/9b6b2db77bc3121fe435f1d4b56e34de443bec75
- https://git.kernel.org/stable/c/7d91adc0ccb060ce564103315189466eb822cc6a
- https://git.kernel.org/stable/c/285e9210b1fab96a11c0be3ed5cea9dd48b6ac54
- https://git.kernel.org/stable/c/7f221ccbee4ec662e2292d490a43ce6c314c4594
- https://git.kernel.org/stable/c/cc20226e218a2375d50dd9ac14fb4121b43375ff
- https://git.kernel.org/stable/c/1f3e2e97c003f80c4b087092b225c8787ff91e4d
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.14.253
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.19.214
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.4.290
- https://mirrors.edge.kernel.org/pub/linux/kernel/v4.x/ChangeLog-4.9.288
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.76
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.14.15
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.15
- https://mirrors.edge.kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.4.156