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CVE-2026-53218

kernel: netfilter: nft_exthdr: fix register tracking for F_PRESENT flag

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Severity

Moderate

Red Hat Product Security

7

CVSS 3.1

Review impact separately from score.

Published · June 25, 2026

Updated · July 3, 2026

Description

A flaw was found in the Linux kernel's netfilter component. This vulnerability occurs in the nft_exthdr module when handling user-controlled data lengths with a specific flag, NFT_EXTHDR_F_PRESENT, enabled. An attacker could exploit this by providing a crafted input, leading to the exposure of uninitialized stack memory. This information disclosure could potentially reveal sensitive system data.

CVSS score applicability

The CVSS score(s) listed for this vulnerability do not reflect the associated product's status, and are included for informational purposes to better understand the severity of this vulnerability.

Mitigation

No mitigation is specified in collected source.

CVSS / CWE

CVSS 3.1 · 7
CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

CWE-824 · Access of Uninitialized Pointer