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Vulnerability record · CVE-2026-64054 · published 19 July 2026

CVE-2026-64054: Linux kernel double free vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: net: shaper: reject duplicate leaves in GROUP request net_shaper_nl_group_doit() does not deduplicate NET_SHAPER_A_LEAVES entries. When userspace supplies the same leaf handle twice, the same old-parent pointer lands twice in old_nodes[]. The cleanup loop double frees the parent. Of course the same parent may still be in old_nodes[] twice if we are moving multiple of its leaves. Note that this patch also implicitly fixes the fact that the i >= leaves_count path forgets to set ret.

7.8 CVSS 3.1 High EPSS 0.13% · top 98.0% CWE-415 · Double free
7.8CVSS 3.1 base score
0.13%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
3References
2 Sep 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: net: shaper: reject duplicate leaves in GROUP request net_shaper_nl_group_doit() does not deduplicate NET_SHAPER_A_LEAVES entries. When userspace supplies the same leaf handle twice, the same old-parent pointer lands twice in old_nodes[]. The cleanup loop double frees the parent. Of course the same parent may still be in old_nodes[] twice if we are moving multiple of its leaves. Note that this patch also implicitly fixes the fact that the i >= leaves_count path forgets to set ret.

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products

1 vulnerable configurations from NVD's CPE data, grouped by vendor and product.

References

LinkTags
https://git.kernel.org/stable/c/31767bf852b59f05125b58a17007e4cd1ea9eb2e Patch
https://git.kernel.org/stable/c/5098b223f0f0c5c18a3884a8b0ea5bd4a0c7bd75 Patch
https://git.kernel.org/stable/c/a9a2fa1da619f276580b0d4c5d12efac89e8642b Patch

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Source: NIST National Vulnerability Database (record CVE-2026-64054), CISA KEV, FIRST EPSS (scores of 2026-09-27). This page is refreshed as NVD updates the record.