CVE-2026-31428None▾ SunlitIn 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_pu…
▾ Sunlit zone — Low / medium · no exploitation signal
impact 2.8 · likelihood 0 · exploitation 0
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Exploit-prediction probability, daily snapshots since Sep 8.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
Last analysed / modified upstream
0.1%
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.
Linux >= df6fb868d6118686805c2fa566e213a8f31c8e4f < 7f3e5d72455936f42709116fabeca3bb216cda62Linux >= df6fb868d6118686805c2fa566e213a8f31c8e4f < 21d8efda029948d3666b0db5afcc0d36c0984aaeLinux >= df6fb868d6118686805c2fa566e213a8f31c8e4f < fc961dd7272b5e4a462999635e44a4770d7f2482Linux >= df6fb868d6118686805c2fa566e213a8f31c8e4f < a8365d1064ded323797c5e28e91070c52f44b76cLinux >= df6fb868d6118686805c2fa566e213a8f31c8e4f < a2f6ff3444b663d6cfa63eadd61327a18592885aLinux >= df6fb868d6118686805c2fa566e213a8f31c8e4f < c9f6c51d36482805ac3ffadb9663fe775a13e926Linux >= df6fb868d6118686805c2fa566e213a8f31c8e4f < 7eff72968161fb8ddb26113344de3b92fb7d7ef5Linux >= df6fb868d6118686805c2fa566e213a8f31c8e4f < 52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7Linux 2.6.24Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Connected by shared product, vendor, weakness, or advisory.
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