CVE-2026-31681
MEDIUMAttack Surface
CVSS Vector Breakdown
Description
In the Linux kernel, the following vulnerability has been resolved: netfilter: xt_multiport: validate range encoding in checkentry ports_match_v1() treats any non-zero pflags entry as the start of a port range and unconditionally consumes the next ports[] element as the range end. The checkentry path currently validates protocol, flags and count, but it does not validate the range encoding itself. As a result, malformed rules can mark the last slot as a range start or place two range starts back to back, leaving ports_match_v1() to step past the last valid ports[] element while interpreting the rule. Reject malformed multiport v1 rules in checkentry by validating that each range start has a following element and that the following element is not itself marked as another range start.
Affected Software (26)
| Vendor | Product | Version |
|---|---|---|
| Linux | Linux | a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < 8c5bf8f5b478f569191c4a7982de7cd5f5f73c1a |
| Linux | Linux | a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < c9749f6232c845e31c21d4cc72200211df15d8a2 |
| Linux | Linux | a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < b67d638cbee9975c765feb45c126e96ed11ec802 |
| Linux | Linux | a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < 36bf0d98e180a7c384c8d8a59b0d2d4b80e5eb16 |
| Linux | Linux | a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < aec14808271f2bf2b656de6ff12dfe73c5fd3b67 |
| Linux | Linux | a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < 8368ce8eb01f0b91111d814703696e780d0ef12f |
| Linux | Linux | a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < 1e4baa853f1cc4227e04f52d6860524707cfb294 |
| Linux | Linux | a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < ff64c5bfef12461df8450e0f50bb693b5269c720 |
| Linux | Linux | 2.6.17 |
| Linux | Linux | a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < 8c5bf8f5b478f569191c4a7982de7cd5f5f73c1a |
| Linux | Linux | a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < c9749f6232c845e31c21d4cc72200211df15d8a2 |
| Linux | Linux | a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < b67d638cbee9975c765feb45c126e96ed11ec802 |
| Linux | Linux | a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < 36bf0d98e180a7c384c8d8a59b0d2d4b80e5eb16 |
| Linux | Linux | a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < aec14808271f2bf2b656de6ff12dfe73c5fd3b67 |
| Linux | Linux | a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < 8368ce8eb01f0b91111d814703696e780d0ef12f |
| Linux | Linux | a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < 1e4baa853f1cc4227e04f52d6860524707cfb294 |
| Linux | Linux | a89ecb6a2ef732d04058d87801e2b6bd7e5c7089 < ff64c5bfef12461df8450e0f50bb693b5269c720 |
| Linux | Linux | 2.6.17 |
| linux | linux_kernel | 2.6.17 – 6.6.136 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |
| linux | linux_kernel | 7.0 |