CVE-2026-43452

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

8.2CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H

EPSS

0.5% chance of exploitation in the next 30 days; higher than 45% of CVEs (scores of 2026-10-25)

CWE

CWE-125

Published

2026-05-08

Modified

2026-10-19

Record from

the NVD, synced 2026-10-21

Affected

• linux:linux_kernel

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

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