PT-2024-11157 · Linux+2 · Linux Kernel+2

Leon Romanovsky · Published 2021-05-10 · Updated 2024-12-09 · CVE-2021-47080

Positive Technologies (AI Summary)

CVSS v3.1

5.5

Medium

Base vector

AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Name of the Vulnerable Software and Affected Versions Linux kernel versions prior to 5.13.0-rc1+

Description A divide-by-zero error can be triggered in the Linux kernel by a user-supplied value, specifically the user entry size, which is used as a denominator to calculate the number of entries. When a zero value is supplied, it triggers a divide-by-zero error. The error occurs in the ib uverbs handler UVERBS METHOD QUERY GID TABLE function.

Recommendations To resolve this issue, update the Linux kernel to a version that includes the fix for this vulnerability. As a temporary workaround, consider restricting access to the ib uverbs handler UVERBS METHOD QUERY GID TABLE function until a patch is available. Avoid using the user entry size parameter with a value of zero in the affected API endpoint until the issue is resolved.

Fix

Divide By Zero

Weakness Enumeration

CWE-369

Related Identifiers

BDU:2025-07268

CESA-2021_4356

CVE-2021-47080

RHSA-2021:4356

RHSA-2021_4356

Affected Products

Centos

Linux Kernel

Red Hat

References · 19

• https://cve.org/CVERecord?id=CVE-2021-47080 · Security Note
• https://security-tracker.debian.org/tracker/CVE-2021-47080 · Vendor Advisory
• https://git.kernel.org/stable/c/54d87913f147a983589923c7f651f97de9af5be1 · Patch
• https://nvd.nist.gov/vuln/detail/CVE-2021-47080 · Security Note
• https://osv.dev/vulnerability/UBUNTU-CVE-2021-47080 · Vendor Advisory
• https://ubuntu.com/security/CVE-2021-47080 · Vendor Advisory
• https://git.kernel.org/stable/c/e6871b4270c05f8b212e7d98aee82b357972c80a · Patch
• https://bdu.fstec.ru/vul/2025-07268 · Security Note
• https://osv.dev/vulnerability/DEBIAN-CVE-2021-47080 · Vendor Advisory
• https://git.kernel.org/stable/c/66ab7fcdac34b890017f04f391507ef5b2b89a13 · Patch
• https://osv.dev/vulnerability/CVE-2021-47080 · Vendor Advisory
• https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.12.7 · Note
• https://kernel.org/pub/linux/kernel/v5.x/ChangeLog-5.10.40 · Note
• https://lore.kernel.org/linux-cve-announce/2024030142-CVE-2021-47080-eb20@gregkh/T/#u · Note
• https://git.linuxtesting.ru/pub/scm/linux/kernel/git/lvc/linux-stable.git/commit/?h=v5.10.176-lvc1&id=66ab7fcdac34b890017f04f391507ef5b2b89a13 · Note