Description
In the Linux kernel, the following vulnerability has been resolved:
netfilter: nft_exthdr: fix register tracking for F_PRESENT flag
nft_exthdr_init() passes user-controlled priv->len to nft_parse_register_store(), which marks that many bytes in the register bitmap as initialized. However, when NFT_EXTHDR_F_PRESENT is set, the eval paths write only 1 byte (nft_reg_store8) or 4 bytes (*dest = 0 on TCP/DCCP error path). When len > 4, registers beyond the first are never written, retaining uninitialized stack data from nft_regs.
Bail out if userspace requests too much data when F_PRESENT is set.
Metrics
CVSS 3.1 5.5/10
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 | >= c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783, < 8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6; >= c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783, < 19748967d59c31d24d21d40b728570788310b237; >= c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783, < 46fc15a044e9938e7ea77786fb37edd2cd74f031; >= c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783, < cd513e43b4b2bd1de39e2367bc4261c699a8652f; >= c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783, < 67b27434c43b68a97becda98c9f0c8cf6cba2134; >= c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783, < 78069a6d8bc86c9e036eb82c2af4a19cc1871a53; >= c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783, < f08fb3d42fd3aad0b7a263da3ac3ebaf0845e265; >= c078ca3b0c5bf82c2b31906c446d6e2ad8ea0783, < 772cecf198da732faebb5dcfc46d66a505be8495 |
| Linux | Linux | 4.11 |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.6, < * |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.7, < * |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.6, < * |
| Siemens | SIMATIC S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.7, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.6, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.7, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.6, < * |
| Siemens | SIMATIC S7-1500 CPU 1518F-4 PN/DP MFP | >= V3.1.7, < * |
| Siemens | SIMATIC S7-1500 TM MFP - GNU/Linux subsystem | < * |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.6, < * |
| Siemens | SIPLUS S7-1500 CPU 1518-4 PN/DP MFP | >= V3.1.7, < * |
References
- https://git.kernel.org/stable/c/19748967d59c31d24d21d40b728570788310b237Patch
- https://git.kernel.org/stable/c/46fc15a044e9938e7ea77786fb37edd2cd74f031Patch
- https://git.kernel.org/stable/c/67b27434c43b68a97becda98c9f0c8cf6cba2134Patch
- https://git.kernel.org/stable/c/772cecf198da732faebb5dcfc46d66a505be8495Patch
- https://git.kernel.org/stable/c/78069a6d8bc86c9e036eb82c2af4a19cc1871a53Patch
- https://git.kernel.org/stable/c/8738b1b6d0e639ca1fc0f61516afd3557ac4ecc6Patch
- https://git.kernel.org/stable/c/cd513e43b4b2bd1de39e2367bc4261c699a8652fPatch
- https://git.kernel.org/stable/c/f08fb3d42fd3aad0b7a263da3ac3ebaf0845e265Patch
- https://cert-portal.siemens.com/productcert/html/ssa-019113.html
- https://cert-portal.siemens.com/productcert/html/ssa-457936.html
- https://cert-portal.siemens.com/productcert/html/ssa-784472.html
Timeline
- Published
- Jun 25, 2026
- Last modified
- Nov 10, 2026
- NVD status
- Modified