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🛡️ CVE-2026-53000 — enterprise-linux

🟠 CVSS 7.8 — High ✅ No Known Exploit CWE-763 NVD
7.8
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

netfilter: nat: use kfree_rcu to release ops

In the Linux kernel, the following vulnerability has been resolved:

netfilter: nat: use kfree_rcu to release ops

Florian Westphal says:

"Historically this is not an issue, even for normal base hooks: the data

path doesn't use the original nf_hook_ops that are used to register the

callbacks.

However, in v5.14 I added the ability to dump the active netfilter

hooks from userspace.

This code will peek back into the nf_hook_ops that are available

at the tail of the pointer-array blob used by the datapath.

The nat hooks are special, because they are called indirectly from

the central nat dispatcher hook. They are currently invisible to

the nfnl hook dump subsystem though.

But once that changes the nat ops structures have to be deferred too."

Update nf_nat_register_fn() to deal with partial exposition of the hooks

from error path which can be also an issue for nfnetlink_hook.

How this vulnerability can be exploited

This issue can be reached with local access to the system, attack complexity is low, an attacker needs low-level privileges on the target. No user interaction is required. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

CVSS metrics in full

The score comes from this vector: CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

  • Attack vector: Local — a local account, shell or session on the host is needed.
  • Attack complexity: Low — the attack works reliably, with no preparation.
  • Privileges required: Low — an ordinary user account is enough.
  • User interaction: None — nobody has to be tricked into anything.
  • Scope: Unchanged — the damage stays inside the vulnerable component.
  • Confidentiality impact: High — total loss, or loss the attacker controls.
  • Integrity impact: High — total loss, or loss the attacker controls.
  • Availability impact: High — total loss, or loss the attacker controls.

Weakness class

CVE-2026-53000 is classified as CWE-763: Release of Invalid Pointer or Reference. The product attempts to return a memory resource to the system, but it calls the wrong release function or calls the appropriate release function incorrectly.

Affected software

CVE-2026-53000 is recorded against 3 packages.

  • enterprise-linux
  • kernel (from 6.19.0 up to 7.0.10)
  • linux-kernel (from 6.19 up to 7.0.10)

Timeline and source

Published on 24 June 2026 and last revised on 17 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org
git.kernel.org
git.kernel.org
access.redhat.com
access.redhat.com
bugzilla.redhat.com
security.access.redhat.com

Other advisories for this package

enterprise-linux has other advisories on record. If you are patching this one, these are worth checking on the same host:

Same weakness in other software

These advisories are the same class of weakness (CWE-763: Release of Invalid Pointer or Reference) in other software:

Details

Severity HIGH
CVSS Score 7.8
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE CWE-763
Public Exploit ✅ No
Source NVD
Published 2026-06-24
Updated 2026-08-20
Modified 2026-08-17

Affected Packages

Software From version Fixed in
enterprise-linux — —
kernel 6.19.0 7.0.10
linux-kernel 6.19 7.0.10

Similar Threats

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