CVE-2026-52921 Details
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: ipset: stop hash:* range iteration at end The following hash set variants: hash:ip,mark hash:ip,port hash:ip,port,ip hash:ip,port,net iterate IPv4 ranges with a 32-bit iterator. The iterator must stop once the last address in the requested range has been processed. Advancing it once more can move the traversal state past the end of the request, so a later retry may continue from an unintended position. Handle the iterator increment explicitly at the end of the loop and stop once the upper bound has been processed. This keeps the existing retry behaviour intact for valid ranges while preventing traversal from continuing past the original boundary.
A vulnerability in the Linux kernel's netfilter ipset component allows for improper iteration over hash set variants that include IPv4 range data. This issue is present in several hash set types, including hash:ip, mark, port, and combinations thereof. The vulnerability arises because the iteration process can advance beyond the intended range, potentially leading to incorrect data processing. Specifically, the 32-bit iterator used for range traversal must stop after the last address in the specified range has been handled. If the iterator is advanced too far, it can disrupt the traversal state, causing subsequent operations to resume from an unintended position. This flaw can be exploited by manipulating the iteration process to skip over critical data boundaries, creating the potential for erroneous behavior or data handling.
Users can update to the latest version of the Linux kernel where this vulnerability has been fixed. Instructions for updating the kernel can be found in the official Linux documentation or through the package management system of the Linux distribution in use.
Metrics
CVSS 4.0 Severity and Vector Strings:
No CVSS 4.0 data is available for this CVE.
CVSS 3.x Severity and Vector Strings:
No data available for CVSS Version 2.0 on this CVE.
No SSVC data is available for this CVE.
References to Advisories, Solutions, and Tools
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| URL | Source(s) | Tag(s) |
|---|---|---|
| https://git.kernel.org/stable/c/02f75f041a93ea045834da89cd3234f4c1d749b4 | kernel.org | Patch |
| https://git.kernel.org/stable/c/0b530efb2cc9dbdddfd49d392e3a857f0d4ce8dc | kernel.org | Patch |
| https://git.kernel.org/stable/c/0d3a282ab5f165fc207ff49ea5b6ad8f54616bd6 | kernel.org | Patch |
| https://git.kernel.org/stable/c/0d7b33ace701fe397e6e4de145f32e098178d901 | kernel.org | Patch |
| https://git.kernel.org/stable/c/383418c20e69f5761b6ec5238f599423f4fb77fb | kernel.org | Patch |
| https://git.kernel.org/stable/c/952e988163c2ab9939c3db9f0f8e77af6a1bb436 | kernel.org | Patch |
| https://git.kernel.org/stable/c/be75218fadea22e59c8673db212f29c681bf45bb | kernel.org | Patch |
| https://git.kernel.org/stable/c/c281e018af98df91827d65bec00f4956c00a1b02 | kernel.org | Patch |
Weakness Enumeration
| CWE-ID | CWE Name | Source |
|---|---|---|
| CWE-835 | Loop with Unreachable Exit Condition ('Infinite Loop') | [email protected] |
Affected Products
| Product | Versions |
|---|---|
| linux linux kernel | >= 4.14.1, < 5.10.258 >= 5.11, < 5.15.209 >= 5.16, < 6.1.175 >= 6.2, < 6.6.142 >= 6.7, < 6.12.92 >= 6.13, < 6.18.34 >= 6.19, < 7.0.11 4.14 - 4.14 rc5 4.14 rc6 4.14 rc7 4.14 rc8 7.1 rc1 7.1 rc2 7.1 rc3 7.1 rc4 |
CPE
Remediation
| |
Change History
2 change records found show changes
| Date | Action | Recorded By |
|---|---|---|
| Jul 8, 2026 | Initial Analysis | [email protected] |
| Jun 24, 2026 | New CVE Received | kernel.org |