CVE-2026-31428

MEDIUM EPSS 2.5%
Published Apr 13, 20262mo ago · Modified Jun 17, 20261w ago
5.5 CVSS 3.1
Medium
Find Similar
Published Apr 13, 2026 2mo ago
Last Modified Jun 17, 2026 1w ago

Description

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.

CVSS Details

Base Score
5.5
Exploitability
1.8
Impact
3.6
Vector string
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Attack Vector Local
Attack Complexity Low
Privileges Required Low
User Interaction None
Scope Unchanged
Confidentiality None
Integrity None
Availability High

Threat Intelligence

EPSS Exploit Probability
2.5% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-908

Affected Products 12

VendorProductVersionRange
linuxlinux_kernel*≥2.6.24  –  <5.10.253
linuxlinux_kernel*≥5.11  –  <5.15.203
linuxlinux_kernel*≥5.16  –  <6.1.168
linuxlinux_kernel*≥6.2  –  <6.6.131
linuxlinux_kernel*≥6.7  –  <6.12.80
linuxlinux_kernel*≥6.13  –  <6.18.21
linuxlinux_kernel*≥6.19  –  <6.19.11
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any
linuxlinux_kernel7.0any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/21d8efda029948d3666b0db5afcc0d36c0984aae
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7eff72968161fb8ddb26113344de3b92fb7d7ef5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7f3e5d72455936f42709116fabeca3bb216cda62
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a2f6ff3444b663d6cfa63eadd61327a18592885a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a8365d1064ded323797c5e28e91070c52f44b76c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c9f6c51d36482805ac3ffadb9663fe775a13e926
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fc961dd7272b5e4a462999635e44a4770d7f2482
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/21d8efda029948d3666b0db5afcc0d36c0984aae
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7eff72968161fb8ddb26113344de3b92fb7d7ef5
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/7f3e5d72455936f42709116fabeca3bb216cda62
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a2f6ff3444b663d6cfa63eadd61327a18592885a
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/a8365d1064ded323797c5e28e91070c52f44b76c
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/c9f6c51d36482805ac3ffadb9663fe775a13e926
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/fc961dd7272b5e4a462999635e44a4770d7f2482
    Patch