1. Home
  2. Vulnerabilities
  3. CVE-2026-52915
7.1
HIGH CVSS 3.1
CVE-2026-52915
netfilter: ip6t_hbh: reject oversized option lists
Overview
Description

In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_hbh: reject oversized option lists struct ip6t_opts stores at most IP6T_OPTS_OPTSNR option descriptors, but hbh_mt6_check() does not reject larger optsnr values supplied from userspace. Validate optsnr in the rule setup path so only match data that fits the fixed-size opts array can be installed. This follows the existing xtables pattern of rejecting invalid user-provided counts in checkentry() and keeps the packet matching path unchanged. `struct ip6t_opts` has a fixed `opts[IP6T_OPTS_OPTSNR]` array, where `IP6T_OPTS_OPTSNR` is 16, then off-by-one array access is possible: [ 137.924693][ T8692] UBSAN: array-index-out-of-bounds in ../net/ipv6/netfilter/ip6t_hbh.c:110:29 [ 137.926167][ T8692] index 16 is out of range for type '__u16 [16]'

Details
INFO

Published Date :

June 24, 2026, 8:16 a.m.

Last Modified :

July 8, 2026, 3:12 p.m.

Remotely Exploit :

No

Source :

416baaa9-dc9f-4396-8d5f-8c081fb06d67
Impact
Affected Products

The following products are affected by CVE-2026-52915 vulnerability. Even if cvefeed.io is aware of the exact versions of the products that are affected, the information is not represented in the table below.

ID Vendor Product Action
1 Linux linux_kernel
: Total Affected Vendor : 1 | Products : 1
Scoring
CVSS Scores
The Common Vulnerability Scoring System is a standardized framework for assessing the severity of vulnerabilities in software and systems. We collect and displays CVSS scores from various sources for each CVE.
Score Version Severity Vector Exploitability Score Impact Score Source
CVSS 3.1 HIGH 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
Validate user-supplied option counts in the rule setup path to prevent out-of-bounds access.
  • Validate optsnr in the rule setup path.
  • Reject invalid user-provided counts in checkentry().
  • Ensure packet matching path remains unchanged.
References
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-2026-52915.

URL Resource
https://git.kernel.org/stable/c/2d523ba48d4ecc46acfb6aba548292cfcce1ac02 Patch
https://git.kernel.org/stable/c/41ec2e242f1702e8370ddfe14d22b7a766021c3e Patch
https://git.kernel.org/stable/c/4322dcde6b4173c2d8e8e6118ed290794263bcc8 Patch
https://git.kernel.org/stable/c/57b0ac5e1b46f1f0338dff392ef2092e2871b412 Patch
https://git.kernel.org/stable/c/588933f1a2ca5ff99274f8c9f25dc3a25d0191c3 Patch
https://git.kernel.org/stable/c/6feb43c0995ab3a9c826707eb46541a1696fe4f7 Patch
https://git.kernel.org/stable/c/784aadea7a108c9f90985683caa87fb0198c6a39 Patch
https://git.kernel.org/stable/c/db0250470f023f159094052c0bd5ab026a88ae93 Patch
CWE - Common Weakness Enumeration

While CVE identifies specific instances of vulnerabilities, CWE categorizes the common flaws or weaknesses that can lead to vulnerabilities. CVE-2026-52915 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-2026-52915 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).

Results are limited to the first 15 repositories due to potential performance issues.

The following list is the news that have been mention CVE-2026-52915 vulnerability anywhere in the article.

Results are limited to the first 20 news articles due to potential performance issues.

The following table lists the changes that have been made to the CVE-2026-52915 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]

    Jul. 08, 2026

    Action Type Old Value New Value
    Added CWE CWE-129
    Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:2.6.12:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:rc5:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:2.6.12:-:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.1:rc4:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.175 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.209 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.12.1 up to (excluding) 5.10.258 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.92 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.34 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 7.0.11 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.142
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/2d523ba48d4ecc46acfb6aba548292cfcce1ac02 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/41ec2e242f1702e8370ddfe14d22b7a766021c3e Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/4322dcde6b4173c2d8e8e6118ed290794263bcc8 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/57b0ac5e1b46f1f0338dff392ef2092e2871b412 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/588933f1a2ca5ff99274f8c9f25dc3a25d0191c3 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/6feb43c0995ab3a9c826707eb46541a1696fe4f7 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/784aadea7a108c9f90985683caa87fb0198c6a39 Types: Patch
    Added Reference Type kernel.org: https://git.kernel.org/stable/c/db0250470f023f159094052c0bd5ab026a88ae93 Types: Patch
  • CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jun. 28, 2026

    Action Type Old Value New Value
    Added CVSS V3.1 AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:N/A:H
  • New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67

    Jun. 24, 2026

    Action Type Old Value New Value
    Added Affected [{'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '2d523ba48d4ecc46acfb6aba548292cfcce1ac02', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '588933f1a2ca5ff99274f8c9f25dc3a25d0191c3', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '784aadea7a108c9f90985683caa87fb0198c6a39', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '41ec2e242f1702e8370ddfe14d22b7a766021c3e', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': 'db0250470f023f159094052c0bd5ab026a88ae93', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '57b0ac5e1b46f1f0338dff392ef2092e2871b412', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '6feb43c0995ab3a9c826707eb46541a1696fe4f7', 'versionType': 'git'}, {'status': 'affected', 'version': '1da177e4c3f41524e886b7f1b8a0c1fc7321cac2', 'lessThan': '4322dcde6b4173c2d8e8e6118ed290794263bcc8', 'versionType': 'git'}], 'programFiles': ['net/ipv6/netfilter/ip6t_hbh.c'], 'defaultStatus': 'unaffected'}, {'repo': 'https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git', 'vendor': 'Linux', 'product': 'Linux', 'versions': [{'status': 'affected', 'version': '2.6.12'}, {'status': 'unaffected', 'version': '0', 'lessThan': '2.6.12', 'versionType': 'semver'}, {'status': 'unaffected', 'version': '5.10.258', 'versionType': 'semver', 'lessThanOrEqual': '5.10.*'}, {'status': 'unaffected', 'version': '5.15.209', 'versionType': 'semver', 'lessThanOrEqual': '5.15.*'}, {'status': 'unaffected', 'version': '6.1.175', 'versionType': 'semver', 'lessThanOrEqual': '6.1.*'}, {'status': 'unaffected', 'version': '6.6.142', 'versionType': 'semver', 'lessThanOrEqual': '6.6.*'}, {'status': 'unaffected', 'version': '6.12.92', 'versionType': 'semver', 'lessThanOrEqual': '6.12.*'}, {'status': 'unaffected', 'version': '6.18.34', 'versionType': 'semver', 'lessThanOrEqual': '6.18.*'}, {'status': 'unaffected', 'version': '7.0.11', 'versionType': 'semver', 'lessThanOrEqual': '7.0.*'}, {'status': 'unaffected', 'version': '7.1', 'versionType': 'original_commit_for_fix', 'lessThanOrEqual': '*'}], 'programFiles': ['net/ipv6/netfilter/ip6t_hbh.c'], 'defaultStatus': 'affected'}]
    Added Description In the Linux kernel, the following vulnerability has been resolved: netfilter: ip6t_hbh: reject oversized option lists struct ip6t_opts stores at most IP6T_OPTS_OPTSNR option descriptors, but hbh_mt6_check() does not reject larger optsnr values supplied from userspace. Validate optsnr in the rule setup path so only match data that fits the fixed-size opts array can be installed. This follows the existing xtables pattern of rejecting invalid user-provided counts in checkentry() and keeps the packet matching path unchanged. `struct ip6t_opts` has a fixed `opts[IP6T_OPTS_OPTSNR]` array, where `IP6T_OPTS_OPTSNR` is 16, then off-by-one array access is possible: [ 137.924693][ T8692] UBSAN: array-index-out-of-bounds in ../net/ipv6/netfilter/ip6t_hbh.c:110:29 [ 137.926167][ T8692] index 16 is out of range for type '__u16 [16]'
    Added Reference https://git.kernel.org/stable/c/2d523ba48d4ecc46acfb6aba548292cfcce1ac02
    Added Reference https://git.kernel.org/stable/c/41ec2e242f1702e8370ddfe14d22b7a766021c3e
    Added Reference https://git.kernel.org/stable/c/4322dcde6b4173c2d8e8e6118ed290794263bcc8
    Added Reference https://git.kernel.org/stable/c/57b0ac5e1b46f1f0338dff392ef2092e2871b412
    Added Reference https://git.kernel.org/stable/c/588933f1a2ca5ff99274f8c9f25dc3a25d0191c3
    Added Reference https://git.kernel.org/stable/c/6feb43c0995ab3a9c826707eb46541a1696fe4f7
    Added Reference https://git.kernel.org/stable/c/784aadea7a108c9f90985683caa87fb0198c6a39
    Added Reference https://git.kernel.org/stable/c/db0250470f023f159094052c0bd5ab026a88ae93
EPSS is a daily estimate of the probability of exploitation activity being observed over the next 30 days. Following chart shows the EPSS score history of the vulnerability.
CVSS
Vulnerability Scoring Details
Base CVSS Score: 7.1
Attack Vector
Attack Complexity
Privileges Required
User Interaction
Scope
Confidentiality Impact
Integrity Impact
Availability Impact