CVE-2026-43453

Stack disclosure via last-field rulemap overread

Published May 8, 2026 · Updated May 8, 2026

Out-of-bounds read in the Linux Kernel netfilter subsystem allows local users to read stack data or interrupt the system. During the final field iteration, pipapo_drop() evaluates the next rulemap element and passes it to pipapo_unmap(), reading four bytes beyond the stack array. Reachability requires local low-privileged access and execution of the affected nftables pipapo set-removal path; no integrity impact is reported.

CVSS severity7.1
High
EPSS probability0.13%
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 read in the Linux Kernel netfilter subsystem allows local users to read stack data or interrupt the system. During the final field iteration, pipapo_drop() evaluates the next rulemap element and passes it to pipapo_unmap(), reading four bytes beyond the stack array. Reachability requires local low-privileged access and execution of the affected nftables pipapo set-removal path; no integrity impact is reported.

The record

CVE
CVE-2026-43453
Published
May 8, 2026
Updated
May 8, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-125
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 8, 2026CVE publishedPublication date reported by the CVE source.
  2. May 8, 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=3c4287f62044a90e73a561aa05fc46e62da173da <0a55d62cdb628923d8a21724374a70c76ac7d19d
  2. Affected versionversion=3c4287f62044a90e73a561aa05fc46e62da173da <1957e793196e7f8557374fd4eda53abcbb42e1c0
  3. Affected versionversion=3c4287f62044a90e73a561aa05fc46e62da173da <324b749aa5b2d516ccfab933df9d3f56e7807f5f
  4. Affected versionversion=3c4287f62044a90e73a561aa05fc46e62da173da <57fb87ca095d5127cd7a27583b8ec43dcf7c9e9e
  5. Affected versionversion=3c4287f62044a90e73a561aa05fc46e62da173da <60c1d18781e37bfb96290b86510eb01c5fa24d75
  6. Affected versionversion=3c4287f62044a90e73a561aa05fc46e62da173da <d6d8cd2db236a9dd13dbc2d05843b3445cc964b5
  7. Affected versionversion=3c4287f62044a90e73a561aa05fc46e62da173da <dfbdac719198778b581bc0dd055df2542edb8c62
  8. Affected versionversion=3c4287f62044a90e73a561aa05fc46e62da173da <e047f6fbb975f685d6c9fcef95b3b7787a79b46d
  9. Affected versionversion=5.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=3c4287f62044a90e73a561aa05fc46e62da173da <0a55d62cdb628923d8a21724374a70c76ac7d19d; version=3c4287f62044a90e73a561aa05fc46e62da173da <1957e793196e7f8557374fd4eda53abcbb42e1c0; version=3c4287f62044a90e73a561aa05fc46e62da173da <324b749aa5b2d516ccfab933df9d3f56e7807f5f; version=3c4287f62044a90e73a561aa05fc46e62da173da <57fb87ca095d5127cd7a27583b8ec43dcf7c9e9e; version=3c4287f62044a90e73a561aa05fc46e62da173da <60c1d18781e37bfb96290b86510eb01c5fa24d75; version=3c4287f62044a90e73a561aa05fc46e62da173da <d6d8cd2db236a9dd13dbc2d05843b3445cc964b5; version=3c4287f62044a90e73a561aa05fc46e62da173da <dfbdac719198778b581bc0dd055df2542edb8c62; version=3c4287f62044a90e73a561aa05fc46e62da173da <e047f6fbb975f685d6c9fcef95b3b7787a79b46d; version=5.6

Published CVSS scores

7.1NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/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.

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No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 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

Public exploit references

No public exploit references are available in this record.

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Technologies

Your stack

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Your stack

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