CVE-2026-43070

Local privilege escalation via stale BPF register ID

Published May 5, 2026 · Updated May 5, 2026

Out-of-bounds memory access in the Linux Kernel eBPF verifier allows local users to corrupt or disclose kernel memory via crafted bytecode. In kernel/bpf/verifier.c, BPF_END mutates a scalar but leaves dst_reg->id linked, so later branches copy invalid bounds to its peer. Reachability requires permission to load eBPF programs through bpf(); successful exploitation grants kernel-memory access, enabling privilege escalation or a host crash.

CVSS severity7.8
High
EPSS probability0.12%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Out-of-bounds memory access in the Linux Kernel eBPF verifier allows local users to corrupt or disclose kernel memory via crafted bytecode. In kernel/bpf/verifier.c, BPF_END mutates a scalar but leaves dst_reg->id linked, so later branches copy invalid bounds to its peer. Reachability requires permission to load eBPF programs through bpf(); successful exploitation grants kernel-memory access, enabling privilege escalation or a host crash.

The record

CVE
CVE-2026-43070
Published
May 5, 2026
Updated
May 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 5, 2026CVE publishedPublication date reported by the CVE source.
  2. May 5, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

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Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=4c03342e5ac532fb34d13a7b51dd7261dfc48963 <a17443af874229408ce6b78e2c8a2b5adeb4b7d8
  2. Affected versionversion=6.18.17 <6.18.21
  3. Affected versionversion=6.19.7 <6.19.11
  4. Affected versionversion=9d21199842247ab05c675fb9b6c6ca393a5c0024 <a3125bc01884431d30d731461634c8295b6f0529
  5. Affected versionversion=d00ce96623a69a100ad79675d0e85fda3c50d89b <0d15c3611a2cc5d08993545d4032055ae10ae2c1

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4c03342e5ac532fb34d13a7b51dd7261dfc48963 <a17443af874229408ce6b78e2c8a2b5adeb4b7d8; version=6.18.17 <6.18.21; version=6.19.7 <6.19.11; version=9d21199842247ab05c675fb9b6c6ca393a5c0024 <a3125bc01884431d30d731461634c8295b6f0529; version=d00ce96623a69a100ad79675d0e85fda3c50d89b <0d15c3611a2cc5d08993545d4032055ae10ae2c1

Published CVSS scores

7.8UbuntuCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.8LinuxCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
8.5UbuntuCVSS:4.0/AV:L/AC:L/AT:N/PR:L/UI:N/VC:H/VI:H/VA:H/SC:N/SI:N/SA:N

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

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No observations available

Sep 9, 2026Sep 15, 2026
Latest reporting daySep 15, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-125Out-of-bounds Read
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

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Your stack

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