CVE-2026-31681
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.
AI Insight
LLM-synthesized narrative grounded in this CVE's description and references.
Affected products
14cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*+ 8 more
- cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*range: >=2.6.17,<6.6.136
- cpe:2.3:o:linux:linux_kernel:7.0:rc1:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc2:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc3:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc4:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc5:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc6:*:*:*:*:*:*
- cpe:2.3:o:linux:linux_kernel:7.0:rc7:*:*:*:*:*:*
- (no CPE)
- osv-coords5 versionspkg:apk/chainguard/linux-aws-6.18pkg:apk/chainguard/linux-azure-6.18pkg:apk/chainguard/linux-gcp-6.18pkg:apk/chainguard/linux-qemu-6.18pkg:apk/chainguard/linux-vmware-6.18
< 6.18.31-r0+ 4 more
- (no CPE)range: < 6.18.31-r0
- (no CPE)range: < 6.18.31-r0
- (no CPE)range: < 6.18.31-r0
- (no CPE)range: < 6.18.24-r3
- (no CPE)range: < 6.18.31-r0
Patches
Vulnerability mechanics
References
8- git.kernel.org/stable/c/1e4baa853f1cc4227e04f52d6860524707cfb294nvdPatch
- git.kernel.org/stable/c/36bf0d98e180a7c384c8d8a59b0d2d4b80e5eb16nvdPatch
- git.kernel.org/stable/c/8368ce8eb01f0b91111d814703696e780d0ef12fnvdPatch
- git.kernel.org/stable/c/aec14808271f2bf2b656de6ff12dfe73c5fd3b67nvdPatch
- git.kernel.org/stable/c/ff64c5bfef12461df8450e0f50bb693b5269c720nvdPatch
- git.kernel.org/stable/c/8c5bf8f5b478f569191c4a7982de7cd5f5f73c1anvd
- git.kernel.org/stable/c/b67d638cbee9975c765feb45c126e96ed11ec802nvd
- git.kernel.org/stable/c/c9749f6232c845e31c21d4cc72200211df15d8a2nvd
News mentions
0No linked articles in our index yet.