In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_exthdr: fix register tracking for F_PRESENT flag nft_exthdr_init() passes user-controlled priv->len to nft_parse_register_store(), which marks that many bytes in the register bitmap as initialized. However, when NFT_EXTHDR_F_PRESENT is set, the eval paths write only 1 byte (nft_reg_store8) or 4 bytes (*dest = 0 on TCP/DCCP error path). When len > 4, registers beyond the first are never written, retaining uninitialized stack data from nft_regs. Bail out if userspace requests too much data when F_PRESENT is set.

Metrics

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No CVSS v3.1

No CVSS v3.0

No CVSS v2

This CVE is not in the KEV list.

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Affected Vendors & Products

Vendors Products
Linux
  • Linux Kernel

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References
Link Providers
https://git.kernel.org/stable/c/19748967d59c31d24d21d40b728570788310b237 cve-icon
https://git.kernel.org/stable/c/46fc15a044e9938e7ea77786fb37edd2cd74f031 cve-icon
https://git.kernel.org/stable/c/67b27434c43b68a97becda98c9f0c8cf6cba2134 cve-icon
https://git.kernel.org/stable/c/772cecf198da732faebb5dcfc46d66a505be8495 cve-icon
https://git.kernel.org/stable/c/78069a6d8bc86c9e036eb82c2af4a19cc1871a53 cve-icon
https://git.kernel.org/stable/c/8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6 cve-icon
https://git.kernel.org/stable/c/cd513e43b4b2bd1de39e2367bc4261c699a8652f cve-icon
https://git.kernel.org/stable/c/f08fb3d42fd3aad0b7a263da3ac3ebaf0845e265 cve-icon
History

Thu, 25 Jun 2026 12:15:00 +0000

Type Values Removed Values Added
Weaknesses CWE-457

Thu, 25 Jun 2026 09:15:00 +0000

Type Values Removed Values Added
Description In the Linux kernel, the following vulnerability has been resolved: netfilter: nft_exthdr: fix register tracking for F_PRESENT flag nft_exthdr_init() passes user-controlled priv->len to nft_parse_register_store(), which marks that many bytes in the register bitmap as initialized. However, when NFT_EXTHDR_F_PRESENT is set, the eval paths write only 1 byte (nft_reg_store8) or 4 bytes (*dest = 0 on TCP/DCCP error path). When len > 4, registers beyond the first are never written, retaining uninitialized stack data from nft_regs. Bail out if userspace requests too much data when F_PRESENT is set.
Title netfilter: nft_exthdr: fix register tracking for F_PRESENT flag
First Time appeared Linux
Linux linux Kernel
CPEs cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*
Vendors & Products Linux
Linux linux Kernel
References
cve-icon MITRE

Status: PUBLISHED

Assigner: Linux

Published:

Updated: 2026-06-25T08:39:21.069Z

Reserved: 2026-06-09T07:44:35.392Z

Link: CVE-2026-53218

cve-icon Vulnrichment

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cve-icon NVD

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cve-icon Redhat

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cve-icon OpenCVE Enrichment

Updated: 2026-06-25T12:00:14Z