Description
In the Linux kernel, the following vulnerability has been resolved:
xfrm: clear trailing padding in build_polexpire()
build_expire() clears the trailing padding bytes of struct xfrm_user_expire after setting the hard field via memset_after(), but the analogous function build_polexpire() does not do this for struct xfrm_user_polexpire.
The padding bytes after the __u8 hard field are left uninitialized from the heap allocation, and are then sent to userspace via netlink multicast to XFRMNLGRP_EXPIRE listeners, leaking kernel heap memory contents.
Add the missing memset_after() call, matching build_expire().
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:HAffected software
| Vendor | Product | Versions |
|---|---|---|
| Linux | Linux | >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < a5127501c8d30b5728791b1e340284ca5c9cc4bd; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e6f4ffe8596947a595c9544e73a73adcb0568b88; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < ac6985903db047eaff54db929e4bf6b06782788e; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < c221ed63a2769a0af8bd849dfe25740048f34ef4; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < eda30846ea54f8ed218468e5480c8305ca645e37; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < b1dfd6b27df35ef4f87825aa5f607378d23ff0f2; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < e1af65c669ebb1666c54576614c01a7f9ffcfff6; >= 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2, < 71a98248c63c535eaa4d4c22f099b68d902006d0 |
| Linux | Linux | 2.6.12 |
| 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/71a98248c63c535eaa4d4c22f099b68d902006d0Patch
- https://git.kernel.org/stable/c/a5127501c8d30b5728791b1e340284ca5c9cc4bd
- https://git.kernel.org/stable/c/ac6985903db047eaff54db929e4bf6b06782788ePatch
- https://git.kernel.org/stable/c/b1dfd6b27df35ef4f87825aa5f607378d23ff0f2Patch
- https://git.kernel.org/stable/c/c221ed63a2769a0af8bd849dfe25740048f34ef4Patch
- https://git.kernel.org/stable/c/e1af65c669ebb1666c54576614c01a7f9ffcfff6Patch
- https://git.kernel.org/stable/c/e6f4ffe8596947a595c9544e73a73adcb0568b88
- https://git.kernel.org/stable/c/eda30846ea54f8ed218468e5480c8305ca645e37Patch
- 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 24, 2026
- Last modified
- Nov 11, 2026
- NVD status
- Modified