CVE-2026-23001
macvlan: fix possible UAF in macvlan_forward_source()
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
INFO
Published Date :
Jan. 25, 2026, 3:15 p.m.
Last Modified :
March 25, 2026, 7:23 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | [email protected] |
Solution
- Add RCU protection on (struct macvlan_source_entry)->vlan.
- Clear entry->vlan pointer before RCU grace period starts.
- Apply the fix to the Linux kernel source code.
- Update the Linux kernel to the patched version.
Public PoC/Exploit Available at Github
CVE-2026-23001 has a 1 public
PoC/Exploit available at Github.
Go to the Public Exploits tab to see the list.
References to Advisories, Solutions, and Tools
Here, you will find a curated list of external links that provide in-depth
information, practical solutions, and valuable tools related to
CVE-2026-23001.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-23001 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
(CAPEC)
stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2026-23001
weaknesses.
We scan GitHub repositories to detect new proof-of-concept exploits. Following list is a collection of public exploits and proof-of-concepts, which have been published on GitHub (sorted by the most recently updated).
Red Hat Enterprise Linux - Security Information Gathering Commands and Scripts
Shell
Results are limited to the first 15 repositories due to potential performance issues.
The following list is the news that have been mention
CVE-2026-23001 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-23001 vulnerability over time.
Vulnerability history details can be useful for understanding the evolution of a vulnerability, and for identifying the most recent changes that may impact the vulnerability's severity, exploitability, or other characteristics.
-
Initial Analysis by [email protected]
Mar. 25, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H Added CWE CWE-416 Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.7 *cpe:2.3:o:linux:linux_kernel:6.19:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.19:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.19:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.19:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.19:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.199 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.162 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.122 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.67 *cpe:2.3:o:linux:linux_kernel:6.19:rc6:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.19:rc7:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:6.19:rc8:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:3.18:-:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 3.18.1 up to (excluding) 5.10.249 Added Reference Type kernel.org: https://git.kernel.org/stable/c/15f6faf36e162532bec5cc05eb3fc622108bf2ed Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/232afc74a6dde0fe1830988e5827921f5ec9bb3f Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/484919832e2db6ce1e8add92c469e5d459a516b5 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/6dbead9c7677186f22b7981dd085a0feec1f038e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/7470a7a63dc162f07c26dbf960e41ee1e248d80e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/8133e85b8a3ec9f10d861e0002ec6037256e987e Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/8518712a2ca952d6da2238c6f0a16b4ae5ea3f13 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Feb. 06, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/232afc74a6dde0fe1830988e5827921f5ec9bb3f Added Reference https://git.kernel.org/stable/c/484919832e2db6ce1e8add92c469e5d459a516b5 Added Reference https://git.kernel.org/stable/c/8133e85b8a3ec9f10d861e0002ec6037256e987e -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jan. 30, 2026
Action Type Old Value New Value Added Reference https://git.kernel.org/stable/c/15f6faf36e162532bec5cc05eb3fc622108bf2ed -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Jan. 25, 2026
Action Type Old Value New Value Added 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 Added Reference https://git.kernel.org/stable/c/6dbead9c7677186f22b7981dd085a0feec1f038e Added Reference https://git.kernel.org/stable/c/7470a7a63dc162f07c26dbf960e41ee1e248d80e Added Reference https://git.kernel.org/stable/c/8518712a2ca952d6da2238c6f0a16b4ae5ea3f13