CVE-2021-3490 — Improper Input Validation in Kernel

CWE-20 — Improper Input ValidationCWE-787 — Out-of-bounds WriteCWE-125 — Out-of-bounds ReadCWE-119 — Improper Restriction of Operations within the Bounds of a Memory Buffer15 documents9 sources
Severity
7.8HIGHNVD
EPSS
3.7%
top 12.01%
CISA KEV
Not in KEV
Exploit
No known exploits
Affected products
2
Linux KernelCanonical Ubuntu Linux
Timeline
PublishedJun 4
Latest updateMay 24

Description

The eBPF ALU32 bounds tracking for bitwise ops (AND, OR and XOR) in the Linux kernel did not properly update 32-bit bounds, which could be turned into out of bounds reads and writes in the Linux kernel and therefore, arbitrary code execution. This issue was fixed via commit 049c4e13714e ("bpf: Fix alu32 const subreg bound tracking on bitwise operations") (v5.13-rc4) and backported to the stable kernels in v5.12.4, v5.11.21, and v5.10.37. The AND/OR issues were introduced by commit 3f50f132d840 (…

CVSS vector

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:HExploitability: 1.8 | Impact: 5.9

Affected Packages3 packages

▶CVEListV5linux/linux_kerneltrunk — v5.13-rc4+4
▶NVDlinux/linux_kernel5.10 — 5.10.37+3
▶Debianlinux/linux_kernel< 5.10.38-1+3

Also affects: Ubuntu Linux 20.04, 20.10, 21.04

Patches

Patch: git.kernel.org ↗Patch: www.openwall.com ↗Patch: git.kernel.org ↗

🔴Vulnerability Details

6
GHSA
GHSA-9wfm-q59x-qc3x: The eBPF ALU32 bounds tracking for bitwise ops (AND, OR and XOR) in the Linux kernel did not properly update 32-bit bounds, which could be turned into↗2022-05-24
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OSV
CVE-2021-3490: In scalar32_min_max_and and related functions of verifier↗2021-10-01
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OSV
CVE-2021-3490: The eBPF ALU32 bounds tracking for bitwise ops (AND, OR and XOR) in the Linux kernel did not properly update 32-bit bounds, which could be turned into↗2021-06-04
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CVEList
Linux kernel eBPF bitwise ops ALU32 bounds tracking↗2021-06-04
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OSV
linux-oem-5.10 vulnerabilities↗2021-05-11
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🔍Detection Rules

1
YARA
Linux_Exploit_CVE_2021_3490_d369d615↗
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📋Vendor Advisories

5
Red Hat
kernel: Linux kernel eBPF bitwise ops ALU32 bounds tracking↗2021-05-11
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Ubuntu
Linux kernel (OEM) vulnerabilities↗2021-05-11
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Ubuntu
Linux kernel vulnerabilities↗2021-05-11
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Ubuntu
Linux kernel vulnerabilities↗2021-05-11
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Debian
CVE-2021-3490: linux - The eBPF ALU32 bounds tracking for bitwise ops (AND, OR and XOR) in the Linux ke...↗2021
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🕵️Threat Intelligence

1
Crowdstrike
Exploiting CVE-2021-3490 for Container Escapes↗
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CVE-2021-3490 — Improper Input Validation in Kernel | cvebase