CVE-2026-31513
HighSummary
W jądrze Linuxa zidentyfikowano podatność związana z odczytem poza granicami stosu w funkcji l2cap_ecred_conn_req. Problem występuje, gdy atakujący wysyła źle sformułowane żądanie Enhanced Credit Based Connection Request, co prowadzi do nieprawidłowego obliczenia długości odpowiedzi.
Risk Assessment
Podatność ta może prowadzić do awarii systemu (panic) w wyniku niekontrolowanego odczytu pamięci, co może wpłynąć na stabilność i bezpieczeństwo systemu operacyjnego.
Recommendation
Zaleca się aktualizację jądra Linux do najnowszej wersji, w której ta podatność została naprawiona, aby zminimalizować ryzyko związane z atakami wykorzystującymi tę lukę.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: Bluetooth: L2CAP: Fix stack-out-of-bounds read in l2cap_ecred_conn_req Syzbot reported a KASAN stack-out-of-bounds read in l2cap_build_cmd() that is triggered by a malformed Enhanced Credit Based Connection Request. The vulnerability stems from l2cap_ecred_conn_req(). The function allocates a local stack buffer (`pdu`) designed to hold a maximum of 5 Source Channel IDs (SCIDs), totaling 18 bytes. When an attacker sends a request with more than 5 SCIDs, the function calculates `rsp_len` based on this unvalidated `cmd_len` before checking if the number of SCIDs exceeds L2CAP_ECRED_MAX_CID. If the SCID count is too high, the function correctly jumps to the `response` label to reject the packet, but `rsp_len` retains the attacker's oversized value. Consequently, l2cap_send_cmd() is instructed to read past the end of the 18-byte `pdu` buffer, triggering a KASAN panic. Fix this by moving the assignment of `rsp_len` to a

