Reference page — cumulative record through Monday, October 19, 2026 UTC. Reference pages update as the archive grows; only dated daily editions are immutable pages of record.

CVE-2021-45402

CVE-2021-45402MEDIUM

n/a n/a — The check_alu_op() function in kernel/bpf/verifier.c in the Linux kernel through v5.16-rc5 did not properly update bounds while handling …

  AV  AC  PR  UI  S  C  I  A   CVSS    EPSS   %ile   KEV
   L   L   L   N  U  H  N  N    5.5   .0042   34.5     —

AFFECTED
  Product  Versions  Fixed
  n/a      n/a –     —

TIMELINE
  Dec 20  Reserved by mitre
  Feb 11  Published (CNA: mitre)
  Oct 8   ENRICHED — CVE-2021-45402. Received CVSS 5.5 and CPE data from NVD.
  Oct 8   EXPLOIT PUBLISHED — CVE-2021-45402. Public exploit reference added.

CWE-668 · CNA: mitre · CVSS v3.1 · 3 references · NVD status: Modified

Description

The check_alu_op() function in kernel/bpf/verifier.c in the Linux kernel through v5.16-rc5 did not properly update bounds while handling the mov32 instruction, which allows local users to obtain potentially sensitive address information, aka a "pointer leak."

Lifecycle

Complete event history — 4 events, chronological
Date	Event	Detail
December 20, 2021	Reserved	Reserved by mitre
February 11, 2022	Published	Published (CNA: mitre)
October 8, 2026	ENRICHED	ENRICHED — CVE-2021-45402. Received CVSS 5.5 and CPE data from NVD.
October 8, 2026	EXPLOIT PUBLISHED	EXPLOIT PUBLISHED — CVE-2021-45402. Public exploit reference added.

Affected

Affected products and packages — 1 row
Vendor	Product / Package	Ecosystem	Version introduced	Fixed
n/a	n/a	—	n/a	—

Weaknesses

CWE-668

References (3)

https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=3cf2b61eb06765e27fec6799292d9fb46d0b7e60 [Exploit, Patch, Vendor Advisory]
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=b1a7288dedc6caf9023f2676b4f5ed34cf0d4029 [Exploit, Patch, Vendor Advisory]
https://git.kernel.org/pub/scm/linux/kernel/git/netdev/net.git/commit/?id=e572ff80f05c33cd0cb4860f864f5c9c044280b6 [Patch, Vendor Advisory]

Authoritative record: CVE-2021-45402 at cve.org

Weaknesses: CWE-668

About this page

This is a reference page, not a dated page of record. It assembles the complete lifecycle of CVE-2021-45402 from the CVE Program record, NVD enrichment, the CISA KEV catalog, EPSS, and OSV advisories. The box score's numbers (CVSS, EPSS, KEV status) are current as of Monday, October 19, 2026 UTC and are re-derived as the archive grows; only dated daily editions are immutable pages of record. The authoritative source for this identifier is cve.org.