CVE-2026-31664
5.5 MEDIUMIn the Linux kernel, the following vulnerability has been resolved: xfrm: clear trailing padding in build_polexpire() build_expire() cl...
Published: 2026-04-24 · Last updated: 2026-06-01
Severity and scoring
- CVSS
- 5.5 MEDIUM
- Vector
- CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
Affected products
| Vendor | Product |
|---|---|
| linux | linux_kernel |
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().
Source: NVD
References
- [NVD]https://nvd.nist.gov/vuln/detail/CVE-2026-31664
- [Patch]https://git.kernel.org/stable/c/71a98248c63c535eaa4d4c22f099b68d902006d0
- [Other]https://git.kernel.org/stable/c/a5127501c8d30b5728791b1e340284ca5c9cc4bd
- [Patch]https://git.kernel.org/stable/c/ac6985903db047eaff54db929e4bf6b06782788e
- [Patch]https://git.kernel.org/stable/c/b1dfd6b27df35ef4f87825aa5f607378d23ff0f2
- [Patch]https://git.kernel.org/stable/c/c221ed63a2769a0af8bd849dfe25740048f34ef4
- [Patch]https://git.kernel.org/stable/c/e1af65c669ebb1666c54576614c01a7f9ffcfff6
- [Other]https://git.kernel.org/stable/c/e6f4ffe8596947a595c9544e73a73adcb0568b88
- [Patch]https://git.kernel.org/stable/c/eda30846ea54f8ed218468e5480c8305ca645e37
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