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

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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。

AI Predicted 7.5 Difficulty: Moderate EPSS 0.18% · P7

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux df6fb868d6118686805c2fa566e213a8f31c8e4f< 7f3e5d72455936f42709116fabeca3bb216cda62 affected
df6fb868d6118686805c2fa566e213a8f31c8e4f< 21d8efda029948d3666b0db5afcc0d36c0984aae affected
df6fb868d6118686805c2fa566e213a8f31c8e4f< fc961dd7272b5e4a462999635e44a4770d7f2482 affected
df6fb868d6118686805c2fa566e213a8f31c8e4f< a8365d1064ded323797c5e28e91070c52f44b76c affected
df6fb868d6118686805c2fa566e213a8f31c8e4f< a2f6ff3444b663d6cfa63eadd61327a18592885a affected
df6fb868d6118686805c2fa566e213a8f31c8e4f< c9f6c51d36482805ac3ffadb9663fe775a13e926 affected
df6fb868d6118686805c2fa566e213a8f31c8e4f< 7eff72968161fb8ddb26113344de3b92fb7d7ef5 affected
df6fb868d6118686805c2fa566e213a8f31c8e4f< 52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7 affected
… +10 more rows
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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: CVE Program / CVE List V5
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: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux df6fb868d6118686805c2fa566e213a8f31c8e4f ~ 7f3e5d72455936f42709116fabeca3bb216cda62 -
Linux Linux 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-2026-31414 9.8 CRITICAL netfilter: nf_conntrack_expect: use expect->helper
CVE-2026-31419 7.8 HIGH net: bonding: fix use-after-free in bond_xmit_broadcast()
CVE-2026-31417 7.5 HIGH net/x25: Fix overflow when accumulating packets
CVE-2026-31426 7.0 HIGH ACPI: EC: clean up handlers on probe failure in acpi_ec_setup()
CVE-2026-31427 netfilter: nf_conntrack_sip: fix use of uninitialized rtp_addr in process_sdp
CVE-2026-31425 rds: ib: reject FRMR registration before IB connection is established
CVE-2026-31424 netfilter: x_tables: restrict xt_check_match/xt_check_target extensions for NFPROTO_ARP
CVE-2026-31423 net/sched: sch_hfsc: fix divide-by-zero in rtsc_min()
CVE-2026-31422 net/sched: cls_flow: fix NULL pointer dereference on shared blocks
CVE-2026-31420 bridge: mrp: reject zero test interval to avoid OOM panic
CVE-2026-31421 net/sched: cls_fw: fix NULL pointer dereference on shared blocks
CVE-2026-31418 netfilter: ipset: drop logically empty buckets in mtype_del
CVE-2026-31416 netfilter: nfnetlink_log: account for netlink header size
CVE-2026-31415 ipv6: avoid overflows in ip6_datagram_send_ctl()

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-31428

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