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).
Published 2021-06-04 02:15:07
Updated 2021-09-14 14:31:03
View at NVD,   CVE.org
Vulnerability category: Memory CorruptionInput validation

Exploit prediction scoring system (EPSS) score for CVE-2021-3490

Probability of exploitation activity in the next 30 days: 0.20%

Percentile, the proportion of vulnerabilities that are scored at or less: ~ 57 % EPSS Score History EPSS FAQ

Metasploit modules for CVE-2021-3490

  • Linux eBPF ALU32 32-bit Invalid Bounds Tracking LPE
    Disclosure Date: 2021-05-11
    First seen: 2022-12-23
    exploit/linux/local/cve_2021_3490_ebpf_alu32_bounds_check_lpe
    Linux kernels from 5.7-rc1 prior to 5.13-rc4, 5.12.4, 5.11.21, and 5.10.37 are vulnerable to a bug in the eBPF verifier's verification of ALU32 operations in the scalar32_min_max_and function when performing AND operations, whereby under certain conditions th

CVSS scores for CVE-2021-3490

Base Score Base Severity CVSS Vector Exploitability Score Impact Score Source
7.2
HIGH AV:L/AC:L/Au:N/C:C/I:C/A:C
3.9
10.0
nvd@nist.gov
7.8
HIGH CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
1.8
5.9
nvd@nist.gov
7.8
HIGH CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:C/C:H/I:H/A:H
1.1
6.0
security@ubuntu.com

CWE ids for CVE-2021-3490

  • The product receives input or data, but it does not validate or incorrectly validates that the input has the properties that are required to process the data safely and correctly.
    Assigned by: security@ubuntu.com (Secondary)
  • The product reads data past the end, or before the beginning, of the intended buffer.
    Assigned by: nvd@nist.gov (Primary)
  • The product writes data past the end, or before the beginning, of the intended buffer.
    Assigned by:
    • nvd@nist.gov (Primary)
    • security@ubuntu.com (Secondary)

References for CVE-2021-3490

Products affected by CVE-2021-3490

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