CVE-2026-23359

Kernel stack corruption via unchecked upper-device enumeration

Published Mar 25, 2026 · Updated Mar 25, 2026

Out-of-bounds write in affected Linux Kernel versions allows local users to corrupt kernel stack memory through an XDP devmap redirect. In kernel/bpf/devmap.c, get_upper_ifindexes() writes every upper-device index into a fixed stack array without enforcing its MAX_NEST_DEV capacity. The trigger requires more than eight upper devices, such as macvlans, plus an attached XDP program using BPF_F_BROADCAST and BPF_F_EXCLUDE_INGRESS; the public record establishes memory corruption but no reliable privilege-escalation outcome.

CVSS severity7.8
High
EPSS probability0.13%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds write in affected Linux Kernel versions allows local users to corrupt kernel stack memory through an XDP devmap redirect. In kernel/bpf/devmap.c, get_upper_ifindexes() writes every upper-device index into a fixed stack array without enforcing its MAX_NEST_DEV capacity. The trigger requires more than eight upper devices, such as macvlans, plus an attached XDP program using BPF_F_BROADCAST and BPF_F_EXCLUDE_INGRESS; the public record establishes memory corruption but no reliable privilege-escalation outcome.

The record

CVE
CVE-2026-23359
Published
Mar 25, 2026
Updated
Mar 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Mar 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Mar 25, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

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

  1. Affected versionversion=5.15
  2. Affected versionversion=aeea1b86f9363f3feabb496534d886f082a89f21 <5000e40acc8d0c36ab709662e32120986ac22e7e
  3. Affected versionversion=aeea1b86f9363f3feabb496534d886f082a89f21 <75d474702b2ba8b6bcb26eb3004dbc5e95ffd5d2
  4. Affected versionversion=aeea1b86f9363f3feabb496534d886f082a89f21 <8a95fb9df1105b1618872c2846a6c01e3ba20b45
  5. Affected versionversion=aeea1b86f9363f3feabb496534d886f082a89f21 <b7bf516c3ecd9a2aae2dc2635178ab87b734fef1
  6. Affected versionversion=aeea1b86f9363f3feabb496534d886f082a89f21 <ca831567908fd3f73cf97d8a6c09a5054697a182
  7. Affected versionversion=aeea1b86f9363f3feabb496534d886f082a89f21 <d2c31d8e03d05edc16656e5ffe187f0d1da763d7

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.15; version=aeea1b86f9363f3feabb496534d886f082a89f21 <5000e40acc8d0c36ab709662e32120986ac22e7e; version=aeea1b86f9363f3feabb496534d886f082a89f21 <75d474702b2ba8b6bcb26eb3004dbc5e95ffd5d2; version=aeea1b86f9363f3feabb496534d886f082a89f21 <8a95fb9df1105b1618872c2846a6c01e3ba20b45; version=aeea1b86f9363f3feabb496534d886f082a89f21 <b7bf516c3ecd9a2aae2dc2635178ab87b734fef1; version=aeea1b86f9363f3feabb496534d886f082a89f21 <ca831567908fd3f73cf97d8a6c09a5054697a182; version=aeea1b86f9363f3feabb496534d886f082a89f21 <d2c31d8e03d05edc16656e5ffe187f0d1da763d7

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

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.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

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-787Out-of-bounds Write

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

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo