CVE-2024-27403

Kernel control via nftables route double release

Published May 17, 2024 · Updated Aug 5, 2026

Use-after-free in the nftables flow offload path of the Linux kernel allows local users to gain kernel control via crafted traffic. When flow_offload_add() rejects a duplicate tuple, nft_flow_offload leaves a transferred dst pointer in its route object and the error path releases it twice. A user namespace supplies the required CAP_NET_ADMIN; triggering the deterministic collision can disclose or overwrite kernel memory or cause an oops or panic.

CVSS severity7.8
High
EPSS probability0.24%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
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Summary

What happened

Use-after-free in the nftables flow offload path of the Linux kernel allows local users to gain kernel control via crafted traffic. When flow_offload_add() rejects a duplicate tuple, nft_flow_offload leaves a transferred dst pointer in its route object and the error path releases it twice. A user namespace supplies the required CAP_NET_ADMIN; triggering the deterministic collision can disclose or overwrite kernel memory or cause an oops or panic.

The record

CVE
CVE-2024-27403
Published
May 17, 2024
Updated
Aug 5, 2026
Vendor
The Linux Kernel Organization
Product
Linux
Classifications
T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 17, 2024CVE publishedPublication date reported by the CVE source.
  2. Aug 5, 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=4.16
  2. Affected versionversion=a3c90f7a2323b331ae816d5b0633e68148e25d04 <012df10717da02367aaf92c65f9c89db206c15f4
  3. Affected versionversion=a3c90f7a2323b331ae816d5b0633e68148e25d04 <4c167af9f6b5ae4a5dbc243d5983c295ccc2e43c
  4. Affected versionversion=a3c90f7a2323b331ae816d5b0633e68148e25d04 <558b00a30e05753a62ecc7e05e939ca8f0241148
  5. Affected versionversion=a3c90f7a2323b331ae816d5b0633e68148e25d04 <670548c8db44d76e40e1dfc06812bca36a61e9ae
  6. Affected versionversion=a3c90f7a2323b331ae816d5b0633e68148e25d04 <9e0f0430389be7696396c62f037be4bf72cf93e3

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linuxversion=4.16; version=a3c90f7a2323b331ae816d5b0633e68148e25d04 <012df10717da02367aaf92c65f9c89db206c15f4; version=a3c90f7a2323b331ae816d5b0633e68148e25d04 <4c167af9f6b5ae4a5dbc243d5983c295ccc2e43c; version=a3c90f7a2323b331ae816d5b0633e68148e25d04 <558b00a30e05753a62ecc7e05e939ca8f0241148; version=a3c90f7a2323b331ae816d5b0633e68148e25d04 <670548c8db44d76e40e1dfc06812bca36a61e9ae; version=a3c90f7a2323b331ae816d5b0633e68148e25d04 <9e0f0430389be7696396c62f037be4bf72cf93e3

Published CVSS scores

7.8Linux kernel CNACVSS: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

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

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Your stack

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