CVE-2026-31681
MediumCVSS 5.5Exploitation Probability (EPSS)
Low risk2th percentile - higher than 2% of all known CVEs
Summary
W jądrze systemu Linux zidentyfikowano podatność w module netfilter, która dotyczy walidacji kodowania zakresu w funkcji checkentry. Funkcja ports_match_v1() błędnie traktuje niezerowe wpisy pflags jako początek zakresu portów, co może prowadzić do nieprawidłowej interpretacji reguł.
Risk Assessment
Nieprawidłowe reguły mogą prowadzić do przekroczenia ostatniego elementu tablicy ports[], co stwarza ryzyko nieautoryzowanego dostępu lub nieprawidłowego działania systemu. Organizacje mogą być narażone na ataki wykorzystujące te błędy w konfiguracji.
Recommendation
Zaleca się aktualizację jądra systemu Linux do najnowszej wersji, aby usunąć tę podatność. Należy również przeprowadzić audyt reguł netfilter w celu identyfikacji i korekty potencjalnie nieprawidłowych konfiguracji.
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Original NVD description (English source)
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.
Vulnerability data from NVD (NIST) · CISA KEV · EPSS