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Vulnerability record · CVE-2026-23001 · published 25 January 2026

CVE-2026-23001: Linux kernel use after free vulnerability

Linux · Linux Kernel

In the Linux kernel, the following vulnerability has been resolved: macvlan: fix possible UAF in macvlan_forward_source() Add RCU protection on (struct macvlan_source_entry)->vlan. Whenever macvlan_hash_del_source() is called, we must clear entry->vlan pointer before RCU grace period starts. This allows macvlan_forward_source() to skip over entries queued for freeing. Note that macvlan_dev are already RCU protected, as they are embedded in a standard netdev (netdev_priv(ndev)). https: //lore.kernel.org/netdev/[email protected]/T/#u

7.8 CVSS 3.1 High EPSS 0.21% · top 90.0% CWE-416 · Use after free
7.8CVSS 3.1 base score
0.21%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
7References
17 Jun 2026Last modified by NVD

Description

In the Linux kernel, the following vulnerability has been resolved: macvlan: fix possible UAF in macvlan_forward_source() Add RCU protection on (struct macvlan_source_entry)->vlan. Whenever macvlan_hash_del_source() is called, we must clear entry->vlan pointer before RCU grace period starts. This allows macvlan_forward_source() to skip over entries queued for freeing. Note that macvlan_dev are already RCU protected, as they are embedded in a standard netdev (netdev_priv(ndev)). https: //lore.kernel.org/netdev/[email protected]/T/#u

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/15f6faf36e162532bec5cc05eb3fc622108bf2ed Patch
https://git.kernel.org/stable/c/232afc74a6dde0fe1830988e5827921f5ec9bb3f Patch
https://git.kernel.org/stable/c/484919832e2db6ce1e8add92c469e5d459a516b5 Patch
https://git.kernel.org/stable/c/6dbead9c7677186f22b7981dd085a0feec1f038e Patch
https://git.kernel.org/stable/c/7470a7a63dc162f07c26dbf960e41ee1e248d80e Patch
https://git.kernel.org/stable/c/8133e85b8a3ec9f10d861e0002ec6037256e987e Patch
https://git.kernel.org/stable/c/8518712a2ca952d6da2238c6f0a16b4ae5ea3f13 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-23001), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.