CVE-2026-43452
netfilter: x_tables: guard option walkers against 1-byte tail reads
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: guard option walkers against 1-byte tail reads When the last byte of options is a non-single-byte option kind, walkers that advance with i += op[i + 1] ? : 1 can read op[i + 1] past the end of the option area. Add an explicit i == optlen - 1 check before dereferencing op[i + 1] in xt_tcpudp and xt_dccp option walkers.
INFO
Published Date :
May 8, 2026, 3:16 p.m.
Last Modified :
May 21, 2026, 4:54 p.m.
Remotely Exploit :
Yes !
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
CVSS Scores
| Score | Version | Severity | Vector | Exploitability Score | Impact Score | Source |
|---|---|---|---|---|---|---|
| CVSS 3.1 | HIGH | 416baaa9-dc9f-4396-8d5f-8c081fb06d67 |
Solution
- Update the Linux kernel to the latest version.
- Apply the specific patch for netfilter x_tables.
- Recompile and install the kernel if necessary.
- Reboot the system to apply changes.
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-2026-43452.
CWE - Common Weakness Enumeration
While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2026-43452 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-2026-43452
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-2026-43452 vulnerability anywhere in the article.
The following table lists the changes that have been made to the
CVE-2026-43452 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.
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Initial Analysis by [email protected]
May. 21, 2026
Action Type Old Value New Value Added CWE NVD-CWE-noinfo Added CPE Configuration OR *cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:* *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.2 up to (excluding) 6.6.130 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.11 up to (excluding) 5.15.203 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 5.16 up to (excluding) 6.1.167 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.13 up to (excluding) 6.18.19 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.7 up to (excluding) 6.12.78 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 6.19 up to (excluding) 6.19.9 *cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* versions from (including) 2.6.16 up to (excluding) 5.10.253 Added Reference Type kernel.org: https://git.kernel.org/stable/c/5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/9b94f0e42ed248eb31929da84ed9f5310d7ff540 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/ae1e1267650638136b84c23f2b31250f0ccb6823 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/bc18551c6169eac5ed813778d3e3e484002dbbe5 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c2a445367a496a3c25dbc940c10c8bd1cfd4c14a Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/c39f84e4be1be63fc60ca7141ea7b76edcea5907 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/cfe770220ac2dbd3e104c6b45094037455da81d4 Types: Patch Added Reference Type kernel.org: https://git.kernel.org/stable/c/d04800323336eebf441d153f43234eac9b833d36 Types: Patch -
CVE Modified by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 11, 2026
Action Type Old Value New Value Added CVSS V3.1 AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H -
New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
May. 08, 2026
Action Type Old Value New Value Added Description In the Linux kernel, the following vulnerability has been resolved: netfilter: x_tables: guard option walkers against 1-byte tail reads When the last byte of options is a non-single-byte option kind, walkers that advance with i += op[i + 1] ? : 1 can read op[i + 1] past the end of the option area. Add an explicit i == optlen - 1 check before dereferencing op[i + 1] in xt_tcpudp and xt_dccp option walkers. Added Reference https://git.kernel.org/stable/c/5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c Added Reference https://git.kernel.org/stable/c/9b94f0e42ed248eb31929da84ed9f5310d7ff540 Added Reference https://git.kernel.org/stable/c/ae1e1267650638136b84c23f2b31250f0ccb6823 Added Reference https://git.kernel.org/stable/c/bc18551c6169eac5ed813778d3e3e484002dbbe5 Added Reference https://git.kernel.org/stable/c/c2a445367a496a3c25dbc940c10c8bd1cfd4c14a Added Reference https://git.kernel.org/stable/c/c39f84e4be1be63fc60ca7141ea7b76edcea5907 Added Reference https://git.kernel.org/stable/c/cfe770220ac2dbd3e104c6b45094037455da81d4 Added Reference https://git.kernel.org/stable/c/d04800323336eebf441d153f43234eac9b833d36