CVE-2026-53267

Kernel stack overwrite via template conntrack copy

Published Jun 25, 2026 · Updated Jun 25, 2026

An out-of-bounds write in Linux Kernel nft_ct evaluation allows local users to corrupt kernel stack memory through a crafted nftables rule. nft_ct_get_eval treats a per-CPU template conntrack as a real entry and performs a 16-byte memcpy past struct nft_regs at NFT_REG32_15. A local user must be able to install the triggering rule; the overwrite can corrupt kernel data or crash the host.

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

An out-of-bounds write in Linux Kernel nft_ct evaluation allows local users to corrupt kernel stack memory through a crafted nftables rule. nft_ct_get_eval treats a per-CPU template conntrack as a real entry and performs a 16-byte memcpy past struct nft_regs at NFT_REG32_15. A local user must be able to install the triggering rule; the overwrite can corrupt kernel data or crash the host.

The record

CVE
CVE-2026-53267
Published
Jun 25, 2026
Updated
Jun 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-674
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jun 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jun 25, 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=4.1
  2. Affected versionversion=45d9bcda21f4c13be75e3571b0f0ef39e77934b5 <2e154b5f53f1b0b490c7b8b02499f90feb86b1d5
  3. Affected versionversion=45d9bcda21f4c13be75e3571b0f0ef39e77934b5 <3027ecbdb5fdf9200251c21d4818e4c447ef78e1
  4. Affected versionversion=45d9bcda21f4c13be75e3571b0f0ef39e77934b5 <8470f676eadeab99132708acb1a85915664d6115
  5. Affected versionversion=45d9bcda21f4c13be75e3571b0f0ef39e77934b5 <af80f78ce984649e1698b841cd33f4fa505ad828
  6. Affected versionversion=45d9bcda21f4c13be75e3571b0f0ef39e77934b5 <f071b0bf078146368d18e4eec386bf2ddc0ab7e0

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=4.1; version=45d9bcda21f4c13be75e3571b0f0ef39e77934b5 <2e154b5f53f1b0b490c7b8b02499f90feb86b1d5; version=45d9bcda21f4c13be75e3571b0f0ef39e77934b5 <3027ecbdb5fdf9200251c21d4818e4c447ef78e1; version=45d9bcda21f4c13be75e3571b0f0ef39e77934b5 <8470f676eadeab99132708acb1a85915664d6115; version=45d9bcda21f4c13be75e3571b0f0ef39e77934b5 <af80f78ce984649e1698b841cd33f4fa505ad828; version=45d9bcda21f4c13be75e3571b0f0ef39e77934b5 <f071b0bf078146368d18e4eec386bf2ddc0ab7e0

Published CVSS scores

7.8kernel.orgCVSS: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-674Uncontrolled Recursion

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

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