CVEvulnerability

CVE-2021-3490

7.8 HIGH Published 2021-06-04 Modified 2026-06-17 Official page ↗
Status
Modified
Published
2021-06-04
Last modified
2026-06-17
Assigner
[email protected]
CVSS 3.1 ([email protected])
7.8 HIGH — CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
CVSS 3.1 ([email protected])
7.8 HIGH — CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CVSS 2.0 ([email protected])
7.2 HIGH — AV:L/AC:L/Au:N/C:C/I:C/A:C
Weaknesses
CWE-125, CWE-20, CWE-787

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 ("bpf: Verifier, do explicit ALU32 bounds tracking") (5.7-rc1) and the XOR variant was introduced by 2921c90d4718 ("bpf:Fix a verifier failure with xor") ( 5.10-rc1).

Affected configurations

• linux linux kernel (>= 5.10 < 5.10.37) • linux linux kernel (>= 5.11 < 5.11.21) • linux linux kernel (>= 5.12 < 5.12.4) • linux linux kernel 5.13 • canonical ubuntu linux 20.04 • canonical ubuntu linux 20.10 • canonical ubuntu linux 21.04

Related

Weakness · CWE (3)

  • CWE-125 Out-of-bounds Read weakness
  • CWE-20 Improper Input Validation weakness
  • CWE-787 Out-of-bounds Write weakness

References