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.
Metrics
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:HWeakness enumeration
Affected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= df6fb868d6118686805c2fa566e213a8f31c8e4f, < 7f3e5d72455936f42709116fabeca3bb216cda62; >= df6fb868d6118686805c2fa566e213a8f31c8e4f, < 21d8efda029948d3666b0db5afcc0d36c0984aae; >= df6fb868d6118686805c2fa566e213a8f31c8e4f, < fc961dd7272b5e4a462999635e44a4770d7f2482; >= df6fb868d6118686805c2fa566e213a8f31c8e4f, < a8365d1064ded323797c5e28e91070c52f44b76c; >= df6fb868d6118686805c2fa566e213a8f31c8e4f, < a2f6ff3444b663d6cfa63eadd61327a18592885a; >= df6fb868d6118686805c2fa566e213a8f31c8e4f, < c9f6c51d36482805ac3ffadb9663fe775a13e926; >= df6fb868d6118686805c2fa566e213a8f31c8e4f, < 7eff72968161fb8ddb26113344de3b92fb7d7ef5; >= df6fb868d6118686805c2fa566e213a8f31c8e4f, < 52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7 |
| Linux | Linux | 2.6.24 |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.6, < * |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.7, < * |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.6, < * |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.7, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.6, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.7, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.6, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.7, < * |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.6, < * |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.5, < * |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.7, < * |
References
- https://git.kernel.org/stable/c/21d8efda029948d3666b0db5afcc0d36c0984aaePatch
- https://git.kernel.org/stable/c/52025ebaa29f4eb4ed8bf92ce83a68f24ab7fdf7Patch
- https://git.kernel.org/stable/c/7eff72968161fb8ddb26113344de3b92fb7d7ef5Patch
- https://git.kernel.org/stable/c/7f3e5d72455936f42709116fabeca3bb216cda62Patch
- https://git.kernel.org/stable/c/a2f6ff3444b663d6cfa63eadd61327a18592885aPatch
- https://git.kernel.org/stable/c/a8365d1064ded323797c5e28e91070c52f44b76cPatch
- https://git.kernel.org/stable/c/c9f6c51d36482805ac3ffadb9663fe775a13e926Patch
- https://git.kernel.org/stable/c/fc961dd7272b5e4a462999635e44a4770d7f2482Patch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-082556.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
Timeline
- Published
- Apr 13, 2026
- Last modified
- Nov 10, 2026
- NVD status
- Modified