CVE-2026-43452
netfilter: x_tables: guard option walkers against 1-byte tail reads
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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.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://git.kernel.org/stable/c/c2a445367a496a3c25dbc940c10c8bd1cfd4c14a
- https://git.kernel.org/stable/c/ae1e1267650638136b84c23f2b31250f0ccb6823
- https://git.kernel.org/stable/c/c39f84e4be1be63fc60ca7141ea7b76edcea5907
- https://git.kernel.org/stable/c/9b94f0e42ed248eb31929da84ed9f5310d7ff540
- https://git.kernel.org/stable/c/5b18b8b35c7cded2d17b2b2604c9b0694ff48d1c
References (8)
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