CVE-2026-64413

Kernel memory corruption via uninitialized chainstack free

Published Jul 25, 2026 · Updated Jul 25, 2026

Uninitialized-pointer access in Linux Kernel ebtables allows local users to corrupt kernel memory during table replacement. A sparse cpu_possible_mask leaves skipped newinfo->chainstack slots uninitialized, and failure of a later vmalloc_node() makes cleanup pass such a slot to vfree(). The path requires CAP_NET_ADMIN in the socket network namespace, a boot-fixed sparse possible-CPU mask, and an uncommon allocation failure; consequences include kernel memory disclosure or modification and a crash or panic.

CVSS severity7.0
High
EPSS probability0.12%
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

Uninitialized-pointer access in Linux Kernel ebtables allows local users to corrupt kernel memory during table replacement. A sparse cpu_possible_mask leaves skipped newinfo->chainstack slots uninitialized, and failure of a later vmalloc_node() makes cleanup pass such a slot to vfree(). The path requires CAP_NET_ADMIN in the socket network namespace, a boot-fixed sparse possible-CPU mask, and an uncommon allocation failure; consequences include kernel memory disclosure or modification and a crash or panic.

The record

CVE
CVE-2026-64413
Published
Jul 25, 2026
Updated
Jul 25, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-824, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. Jul 25, 2026CVE publishedPublication date reported by the CVE source.
  2. Jul 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=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <29bf41a9b59aff9f6197df58641a00037d567ca8
  2. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2ade612967e2cdfb9290ebcb773f302c82f311fa
  3. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <42bef500d07b5769d916e9122a3e3fa3fd2245ef
  4. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5ee856e4208acafaaaf7b84824d39b78c21345d6
  5. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9e6c5169db423e51dcc66a73fd15409c0d38e088
  6. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9f74d28e903fa4fdf82f870d0aeadddc8196e41c
  7. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cbfe53599eebffd188938ab6774cc41794f6f9d5
  8. Affected versionversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fc7f105451044501a50cfd530cfa3b472c54acbc
  9. Affected versionversion=2.6.12

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <29bf41a9b59aff9f6197df58641a00037d567ca8; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <2ade612967e2cdfb9290ebcb773f302c82f311fa; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <42bef500d07b5769d916e9122a3e3fa3fd2245ef; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <5ee856e4208acafaaaf7b84824d39b78c21345d6; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9e6c5169db423e51dcc66a73fd15409c0d38e088; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <9f74d28e903fa4fdf82f870d0aeadddc8196e41c; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <cbfe53599eebffd188938ab6774cc41794f6f9d5; version=1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 <fc7f105451044501a50cfd530cfa3b472c54acbc; version=2.6.12

Published CVSS scores

7.0kernel.orgCVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H
5.5Red HatCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/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.

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-824Access of Uninitialized Pointer
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

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