CVE-2026-23225
HighSummary
W jądrze systemu Linux zidentyfikowano podatność związaną z zarządzaniem MMCID, która prowadzi do dostępu poza granice pamięci (UAF). Problem występuje podczas przełączania trybów, gdy zakłada się, że CID jest przypisany do CPU, co może prowadzić do nieprawidłowego działania systemu.
Risk Assessment
Podatność ta może prowadzić do nieprzewidzianych zachowań systemu, w tym potencjalnych awarii lub naruszeń bezpieczeństwa, co stanowi zagrożenie dla stabilności i integralności systemu operacyjnego.
Recommendation
Zaleca się aktualizację jądra systemu Linux do najnowszej wersji, w której ta podatność została naprawiona, aby zminimalizować ryzyko związane z nieautoryzowanym dostępem do pamięci.
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Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: sched/mmcid: Don't assume CID is CPU owned on mode switch Shinichiro reported a KASAN UAF, which is actually an out of bounds access in the MMCID management code. CPU0 CPU1 T1 runs in userspace T0: fork(T4) -> Switch to per CPU CID mode fixup() set MM_CID_TRANSIT on T1/CPU1 T4 exit() T3 exit() T2 exit() T1 exit() switch to per task mode ---> Out of bounds access. As T1 has not scheduled after T0 set the TRANSIT bit, it exits with the TRANSIT bit set. sched_mm_cid_remove_user() clears the TRANSIT bit in the task and drops the CID, but it does not touch the per CPU storage. That's functionally correct because a CID is only owned by the CPU when the ONCPU bit is set, which is mutually exclusive with the TRANSIT flag. Now sched_mm_cid_exit() assumes that the CID is CPU owned because the prior mode was per CPU. It invokes mm_drop_cid_on_cpu() which clears the not set O