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Vulnerability record · CVE-2026-43452 · published 8 May 2026

CVE-2026-43452: Linux kernel vulnerability

Linux · Linux Kernel

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.

8.2 CVSS 3.1 High EPSS 0.63% · top 51.7%
8.2CVSS 3.1 base score
0.63%EPSS exploitation probability, 30 days
NoNot in CISA KEV
1Affected product versions listed by NVD
8References
17 Jun 2026Last modified by NVD

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.

CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/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/5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c Patch
https://git.kernel.org/stable/c/9b94f0e42ed248eb31929da84ed9f5310d7ff540 Patch
https://git.kernel.org/stable/c/ae1e1267650638136b84c23f2b31250f0ccb6823 Patch
https://git.kernel.org/stable/c/bc18551c6169eac5ed813778d3e3e484002dbbe5 Patch
https://git.kernel.org/stable/c/c2a445367a496a3c25dbc940c10c8bd1cfd4c14a Patch
https://git.kernel.org/stable/c/c39f84e4be1be63fc60ca7141ea7b76edcea5907 Patch
https://git.kernel.org/stable/c/cfe770220ac2dbd3e104c6b45094037455da81d4 Patch
https://git.kernel.org/stable/c/d04800323336eebf441d153f43234eac9b833d36 Patch

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Source: NIST National Vulnerability Database (record CVE-2026-43452), CISA KEV, FIRST EPSS (scores of 2026-09-26). This page is refreshed as NVD updates the record.