CVE-2026-43450

Kernel-memory disclosure via netfilter restart bypass

Published May 8, 2026 · Updated May 8, 2026

Out-of-bounds read in Linux Kernel netfilter allows local users to disclose kernel memory or crash the kernel through a helper-deletion race. nfnl_cthelper_dump_table() restarts after its bucket loop when a saved helper is deleted between dump rounds, bypassing the hash-table bounds check and reading eight bytes past nf_ct_helper_hash. Exploitation requires low-privileged local access and control of the deletion race; the bounded consequences are kernel-memory disclosure and a kernel crash.

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 Linux Kernel netfilter allows local users to disclose kernel memory or crash the kernel through a helper-deletion race. nfnl_cthelper_dump_table() restarts after its bucket loop when a saved helper is deleted between dump rounds, bypassing the hash-table bounds check and reading eight bytes past nf_ct_helper_hash. Exploitation requires low-privileged local access and control of the deletion race; the bounded consequences are kernel-memory disclosure and a kernel crash.

The record

CVE
CVE-2026-43450
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=12f7a505331e6b2754684b509f2ac8f0011ce644 <05018cd9370f77bb18fbf6e15ff33c7a06f10b3c
  2. Affected versionversion=12f7a505331e6b2754684b509f2ac8f0011ce644 <0605e1985a95d4334a67869aee45a47e82301abf
  3. Affected versionversion=12f7a505331e6b2754684b509f2ac8f0011ce644 <3cc328ffc32ddb389cba7b78b6aa95d995c2876e
  4. Affected versionversion=12f7a505331e6b2754684b509f2ac8f0011ce644 <4a1f6ee69267a5f524102c028981410eeacfa3da
  5. Affected versionversion=12f7a505331e6b2754684b509f2ac8f0011ce644 <61b3a1f8621df1a5928118313f133996f6a786db
  6. Affected versionversion=12f7a505331e6b2754684b509f2ac8f0011ce644 <6dcee8496d53165b2d8a5909b3050b62ae71fe89
  7. Affected versionversion=12f7a505331e6b2754684b509f2ac8f0011ce644 <894c5780ddadd5fde0e16f66587918e6be1504c4
  8. Affected versionversion=12f7a505331e6b2754684b509f2ac8f0011ce644 <92441f6d9405a0c18d03f278b395e782f79a4a30
  9. Affected versionversion=3.6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=12f7a505331e6b2754684b509f2ac8f0011ce644 <05018cd9370f77bb18fbf6e15ff33c7a06f10b3c; version=12f7a505331e6b2754684b509f2ac8f0011ce644 <0605e1985a95d4334a67869aee45a47e82301abf; version=12f7a505331e6b2754684b509f2ac8f0011ce644 <3cc328ffc32ddb389cba7b78b6aa95d995c2876e; version=12f7a505331e6b2754684b509f2ac8f0011ce644 <4a1f6ee69267a5f524102c028981410eeacfa3da; version=12f7a505331e6b2754684b509f2ac8f0011ce644 <61b3a1f8621df1a5928118313f133996f6a786db; version=12f7a505331e6b2754684b509f2ac8f0011ce644 <6dcee8496d53165b2d8a5909b3050b62ae71fe89; version=12f7a505331e6b2754684b509f2ac8f0011ce644 <894c5780ddadd5fde0e16f66587918e6be1504c4; version=12f7a505331e6b2754684b509f2ac8f0011ce644 <92441f6d9405a0c18d03f278b395e782f79a4a30; version=3.6

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.

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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