Vulnerability-Lookup

FKIE_CVE-2026-31664

Vulnerability from fkie_nvd - Published: 2026-04-24 15:16 - Updated: 2026-06-01 17:16

Severity

5.5 (Medium) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H

Summary

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().

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/71a98248c63c535eaa4d4c22f099b68d902006d0	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/a5127501c8d30b5728791b1e340284ca5c9cc4bd
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/ac6985903db047eaff54db929e4bf6b06782788e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/b1dfd6b27df35ef4f87825aa5f607378d23ff0f2	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c221ed63a2769a0af8bd849dfe25740048f34ef4	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e1af65c669ebb1666c54576614c01a7f9ffcfff6	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e6f4ffe8596947a595c9544e73a73adcb0568b88
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/eda30846ea54f8ed218468e5480c8305ca645e37	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	2.6.12
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

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CVE-2026-31664 (GCVE-0-2026-31664)

Vulnerability from cvelistv5 – Published: 2026-04-24 14:45 – Updated: 2026-06-01 16:13

Title

xfrm: clear trailing padding in build_polexpire()

Summary

Severity

No CVSS data available.

Assigner

Linux

References

8 references

URL	Tags
https://git.kernel.org/stable/c/a5127501c8d30b572…
https://git.kernel.org/stable/c/e6f4ffe8596947a59…
https://git.kernel.org/stable/c/ac6985903db047eaf…
https://git.kernel.org/stable/c/c221ed63a2769a0af…
https://git.kernel.org/stable/c/eda30846ea54f8ed2…
https://git.kernel.org/stable/c/b1dfd6b27df35ef4f…
https://git.kernel.org/stable/c/e1af65c669ebb1666…
https://git.kernel.org/stable/c/71a98248c63c535ea…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < a5127501c8d30b5728791b1e340284ca5c9cc4bd (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e6f4ffe8596947a595c9544e73a73adcb0568b88 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < ac6985903db047eaff54db929e4bf6b06782788e (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < c221ed63a2769a0af8bd849dfe25740048f34ef4 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < eda30846ea54f8ed218468e5480c8305ca645e37 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < b1dfd6b27df35ef4f87825aa5f607378d23ff0f2 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < e1af65c669ebb1666c54576614c01a7f9ffcfff6 (git) Affected: 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 , < 71a98248c63c535eaa4d4c22f099b68d902006d0 (git)
Linux	Linux	Affected: 2.6.12 Unaffected: 0 , < 2.6.12 (semver) Unaffected: 5.10.258 , ≤ 5.10.* (semver) Unaffected: 5.15.209 , ≤ 5.15.* (semver) Unaffected: 6.1.169 , ≤ 6.1.* (semver) Unaffected: 6.6.135 , ≤ 6.6.* (semver) Unaffected: 6.12.82 , ≤ 6.12.* (semver) Unaffected: 6.18.23 , ≤ 6.18.* (semver) Unaffected: 6.19.13 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
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        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
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        }
      ],
      "title": "xfrm: clear trailing padding in build_polexpire()",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-31664",
    "datePublished": "2026-04-24T14:45:13.922Z",
    "dateReserved": "2026-03-09T15:48:24.129Z",
    "dateUpdated": "2026-06-01T16:13:15.231Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-31664

CVE-2026-31664 (GCVE-0-2026-31664)

Tags

Sightings

Nomenclature