CVE-2026-43452
Published: May 9, 2026Last modified: May 9, 2026
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.
Severity score breakdown
| Parameter | Value |
|---|---|
| Base score | 8.2 |
| Attack Vector | NETWORK |
| Attack complexity | LOW |
| Privileges required | NONE |
| User interaction | NONE |
| Scope | UNCHANGED |
| Confidentiality | LOW |
| Integrity impact | NONE |
| Availability impact | HIGH |
| Vector | CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H |
Status
| Product | Release | Package | Status |
|---|---|---|---|
| Alpaquita Linux | 23 LTS | linux-lts | Fixed (6.1.167-r0) |
| 25 LTS | linux-lts | Fixed (6.12.80-r0) | |
| Stream | linux-lts | Fixed (6.12.80-r0) |
References
- https://git.kernel.org/stable/c/5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c
- https://git.kernel.org/stable/c/9b94f0e42ed248eb31929da84ed9f5310d7ff540
- https://git.kernel.org/stable/c/ae1e1267650638136b84c23f2b31250f0ccb6823
- https://git.kernel.org/stable/c/bc18551c6169eac5ed813778d3e3e484002dbbe5
- https://git.kernel.org/stable/c/c2a445367a496a3c25dbc940c10c8bd1cfd4c14a
- https://git.kernel.org/stable/c/c39f84e4be1be63fc60ca7141ea7b76edcea5907
- https://git.kernel.org/stable/c/cfe770220ac2dbd3e104c6b45094037455da81d4
- https://git.kernel.org/stable/c/d04800323336eebf441d153f43234eac9b833d36