Skip to main content
cve.nowby Sazabi
← All vulnerabilities
CVE-2026-31428

netfilter: nfnetlink_log: fix uninitialized padding leak in NFULA_PAYLOAD

Published
Last modified
published
Not listed in CISA KEV
Fix
Fixed in 5.10.253, 5.15.203, 6.1.168, 6.6.131, 6.12.80, and 2 more
None on Exploit-DB, Metasploit or GitHub

Summary

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.

Timeline

  1. CVE published
  2. Record last updated

Affected versions

  • Linux Linux

    From df6fb868d6118686805c2fa566e213a8f31c8e4f · fixed in 7f3e5d72455936f42709116fabeca3bb216cda62; From df6fb868d6118686805c2fa566e213a8f31c8e4f · fixed in 21d8efda029948d3666b0db5afcc0d36c0984aae; From df6fb868d6118686805c2fa566e213a8f31c8e4f · fixed in fc961dd7272b5e4a462999635e44a4770d7f2482; From df6fb868d6118686805c2fa566e213a8f31c8e4f · fixed in a8365d1064ded323797c5e28e91070c52f44b76c; From df6fb868d6118686805c2fa566e213a8f31c8e4f · fixed in a2f6ff3444b663d6cfa63eadd61327a18592885a; From df6fb868d6118686805c2fa566e213a8f31c8e4f · fixed in c9f6c51d36482805ac3ffadb9663fe775a13e926; From df6fb868d6118686805c2fa566e213a8f31c8e4f · fixed in 7eff72968161fb8ddb26113344de3b92fb7d7ef5; From df6fb868d6118686805c2fa566e213a8f31c8e4f · fixed in 52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7

  • Linux Linux

    2.6.24

  • KernelLinux

    From 2.6.24 · fixed in 5.10.253; From 5.11.0 · fixed in 5.15.203; From 5.16.0 · fixed in 6.1.168; From 6.2.0 · fixed in 6.6.131; From 6.7.0 · fixed in 6.12.80; From 6.13.0 · fixed in 6.18.21; From 6.19.0 · fixed in 6.19.11

References 8

git.kernel.org