CVE-2026-31630
HighCVSS 7.8Summary
W jądrze systemu Linux zidentyfikowano podatność w pomocnikach procfs AF_RXRPC, które formatują lokalne i zdalne adresy gniazd w stałych buforach o rozmiarze 50 bajtów. Bufory te są zbyt małe, aby pomieścić najdłuższy możliwy format adresu IPv6 z portem, co może prowadzić do przepełnienia bufora.
Risk Assessment
Przepełnienie bufora może prowadzić do nieautoryzowanego dostępu lub awarii systemu, co stwarza poważne zagrożenie dla bezpieczeństwa organizacji. W szczególności, atakujący może wykorzystać tę podatność do wykonania złośliwego kodu.
Recommendation
Zaleca się aktualizację jądra systemu Linux do najnowszej wersji, która zawiera poprawki dla tej podatności. Dodatkowo, warto zwiększyć rozmiar buforów w kodzie źródłowym, aby pomieścić maksymalne możliwe formaty adresów.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: rxrpc: proc: size address buffers for %pISpc output The AF_RXRPC procfs helpers format local and remote socket addresses into fixed 50-byte stack buffers with "%pISpc". That is too small for the longest current-tree IPv6-with-port form the formatter can produce. In lib/vsprintf.c, the compressed IPv6 path uses a dotted-quad tail not only for v4mapped addresses, but also for ISATAP addresses via ipv6_addr_is_isatap(). As a result, a case such as [ffff:ffff:ffff:ffff:0:5efe:255.255.255.255]:65535 is possible with the current formatter. That is 50 visible characters, so 51 bytes including the trailing NUL, which does not fit in the existing char[50] buffers used by net/rxrpc/proc.c. Size the buffers from the formatter's maximum textual form and switch the call sites to scnprintf(). Changes since v1: - correct the changelog to cite the actual maximum current-tree case explicitly - frame the proof around the ISATAP formatting path instead of the earlier mapped-v4 example

