CVE-2026-3038
HighSummary
Funkcja rtsock_msg_buffer() serializuje informacje o trasowaniu do bufora, kopiując struktury sockaddr do struktury sockaddr_storage na stosie. Zakłada, że długość źródłowej struktury sockaddr została wcześniej zweryfikowana, co nie zawsze ma miejsce, co może prowadzić do przepełnienia bufora o długości 127 bajtów.
Risk Assessment
Błąd ten pozwala nieuprzywilejowanemu użytkownikowi na zablokowanie jądra poprzez wywołanie przepełnienia bufora na stosie w funkcji rtsock_msg_buffer(). Może to prowadzić do eskalacji uprawnień, jeśli inne błędy jądra umożliwią odczytanie wartości canary.
Recommendation
Zaleca się aktualizację systemu operacyjnego do najnowszej wersji, aby załatać tę podatność oraz monitorowanie logów systemowych w celu wykrycia potencjalnych prób wykorzystania tej luki.
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Original NVD description (English source)
The rtsock_msg_buffer() function serializes routing information into a buffer. As a part of this, it copies sockaddr structures into a sockaddr_storage structure on the stack. It assumes that the source sockaddr length field had already been validated, but this is not necessarily the case, and it's possible for a malicious userspace program to craft a request which triggers a 127-byte overflow. In practice, this overflow immediately overwrites the canary for the rtsock_msg_buffer() stack frame, resulting in a panic once the function returns. The bug allows an unprivileged user to crash the kernel by triggering a stack buffer overflow in rtsock_msg_buffer(). In particular, the overflow will corrupt a stack canary value that is verified when the function returns; this mitigates the impact of the stack overflow by triggering a kernel panic. Other kernel bugs may exist which allow userspace to find the canary value and thus defeat the mitigation, at which point local privilege escal