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🛡️ CVE-2026-31428 — kernel

🟡 CVSS 5.5 — Medium ✅ No Known Exploit NVD
5.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD

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

netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD

__build_packet_message() manually constructs the NFULA_PAYLOAD netlink

attribute using skb_put() and skb_copy_bits(), bypassing the standard

nla_reserve()/nla_put() helpers. While nla_total_size(data_len) bytes

are allocated (including NLA alignment padding), only data_len bytes

of actual packet data are copied. The trailing nla_padlen(data_len)

bytes (1-3 when data_len is not 4-byte aligned) are never initialized,

leaking stale heap contents to userspace via the NFLOG netlink socket.

Replace the manual attribute construction with nla_reserve(), which

handles the tailroom check, header setup, and padding zeroing via

__nla_reserve(). The subsequent skb_copy_bits() fills in the payload

data on top of the properly initialized attribute.

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 none, integrity none, availability high.

Affected software

CVE-2026-31428 is recorded against 2 packages.

  • kernel (from 6.19.0 up to 6.19.11)
  • linux-kernel

Timeline and source

Published on 13 April 2026 and last revised on 12 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

cert-portal.siemens.com (Web)
cert-portal.siemens.com (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-31428 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity Medium
CVSS Score 5.5
CVSS Vector CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-04-13
Updated 2026-08-20
Modified 2026-08-12

Affected Packages

Software From version Fixed in
kernel 6.19.0 6.19.11
linux-kernel — —

References

Similar Threats

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