CVE-2021-3156

Signals

NVD · CVE-2026-64604 · In the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest mode When updating CR8NVD · CVE-2026-64603 · In the Linux kernel, the following vulnerability has been resolved: platform/x86: intel-hid: Protect ACPI notify handler against recursion Since commit e2ffcda1NVD · CVE-2026-64602 · In the Linux kernel, the following vulnerability has been resolved: iio: adc: spear: Initialize completion before requesting IRQ In the report from Jaeyoung ChuNVD · CVE-2026-64601 · In the Linux kernel, the following vulnerability has been resolved: ALSA: us144mkii: capture_urb_complete: redundant usb_anchor_urb corrupts anchor list on eachCISA KEV · CVE-2026-63077 · 9.8 · JetBrains TeamCity Deserialization of Untrusted Data Vulnerability · Added 2026-08-05 · Due 2026-08-08CISA KEV · CVE-2026-18556 · 7.4 · N-able N-central Authentication Bypass Using an Alternate Path or Channel Vulnerability · Added 2026-08-04 · Due 2026-08-07NVD · CVE-2026-64604 · In the Linux kernel, the following vulnerability has been resolved: KVM: VMX: Grab vmcs12 on CR8 interception update iff vCPU is in guest mode When updating CR8NVD · CVE-2026-64603 · In the Linux kernel, the following vulnerability has been resolved: platform/x86: intel-hid: Protect ACPI notify handler against recursion Since commit e2ffcda1NVD · CVE-2026-64602 · In the Linux kernel, the following vulnerability has been resolved: iio: adc: spear: Initialize completion before requesting IRQ In the report from Jaeyoung ChuNVD · CVE-2026-64601 · In the Linux kernel, the following vulnerability has been resolved: ALSA: us144mkii: capture_urb_complete: redundant usb_anchor_urb corrupts anchor list on eachCISA KEV · CVE-2026-63077 · 9.8 · JetBrains TeamCity Deserialization of Untrusted Data Vulnerability · Added 2026-08-05 · Due 2026-08-08CISA KEV · CVE-2026-18556 · 7.4 · N-able N-central Authentication Bypass Using an Alternate Path or Channel Vulnerability · Added 2026-08-04 · Due 2026-08-07

CVE Database · CVE-2021-3156

CVE-2021-3156

· HIGHAnalyzed

CVSS v3.1

7.8

EPSS

99.30%

Published

Jan 26, 2021

Modified

Nov 10, 2025

CISA Known Exploited Vulnerability

Added: 2022-04-06 · Due: 2022-04-27

Apply updates per vendor instructions.

Public PoC / Exploit (11)

All weaponized →

TrickestTrickest PoC index Exploit-DBSudo 1.9.5p1 - 'Baron Samedit ' Heap-Based Buffer Overflow Privilege Escalation (1)Exploit-DBSudo 1.9.5p1 - 'Baron Samedit ' Heap-Based Buffer Overflow Privilege Escalation (2)GitHub PoCblasty/CVE-2021-3156★1020 GitHub PoCworawit/CVE-2021-3156★804 GitHub PoCstong/CVE-2021-3156★429 GitHub PoCLiveOverflow/pwnedit★225 GitHub PoCRvn0xsy/CVE-2021-3156-plus★205 GitHub PoCCptGibbon/CVE-2021-3156★158 GitHub PoCreverse-ex/CVE-2021-3156★112 GitHub PoC0x4ndy/clif★100

Links to public security research (Exploit-DB, Nuclei, Trickest, GitHub) for defensive use only.

Description

Sudo before 1.9.5p2 contains an off-by-one error that can result in a heap-based buffer overflow, which allows privilege escalation to root via "sudoedit -s" and a command-line argument that ends with a single backslash character.

CVSS Vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Weaknesses (CWE)

CWE-193CWE-193

Affected Products (39)

sudo_project · sudo (up to 1.8.32)vulnerable

sudo_project · sudo (up to 1.9.5)vulnerable

sudo_project · sudovulnerable

fedoraproject · fedoravulnerable

debian · debian_linuxvulnerable

netapp · active_iq_unified_managervulnerable

netapp · cloud_backup