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CVE-2026-31428— netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD

EPSS 0.03% · P9
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I. Basic Information for CVE-2026-31428

Vulnerability Information
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Vulnerability Title
netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel存在安全漏洞，该漏洞源于NFULA_PAYLOAD属性存在未初始化的填充泄露，可能导致内核堆内容泄露给用户空间。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux df6fb868d6118686805c2fa566e213a8f31c8e4f ~ 7f3e5d72455936f42709116fabeca3bb216cda62 -
LinuxLinux 2.6.24 -

II. Public POCs for CVE-2026-31428

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III. Intelligence Information for CVE-2026-31428

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Same Patch Batch · Linux · 2026-04-13 · 15 CVEs total

CVE-2026-314149.8 CRITICALnetfilter: nf_conntrack_expect: use expect->helper
CVE-2026-314197.8 HIGHnet: bonding: fix use-after-free in bond_xmit_broadcast()
CVE-2026-314177.5 HIGHnet/x25: Fix overflow when accumulating packets
CVE-2026-314267.0 HIGHACPI: EC: clean up handlers on probe failure in acpi_ec_setup()
CVE-2026-31427netfilter: nf_conntrack_sip: fix use of uninitialized rtp_addr in process_sdp
CVE-2026-31425rds: ib: reject FRMR registration before IB connection is established
CVE-2026-31424netfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP
CVE-2026-31423net/sched: sch_hfsc: fix divide-by-zero in rtsc_min()
CVE-2026-31422net/sched: cls_flow: fix NULL pointer dereference on shared blocks
CVE-2026-31420bridge: mrp: reject zero test interval to avoid OOM panic
CVE-2026-31421net/sched: cls_fw: fix NULL pointer dereference on shared blocks
CVE-2026-31418netfilter: ipset: drop logically empty buckets in mtype_del
CVE-2026-31416netfilter: nfnetlink_log: account for netlink header size
CVE-2026-31415ipv6: avoid overflows in ip6_datagram_send_ctl()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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