CVE-2026-68158
CriticalCVSS 9.8Exploitation Probability (EPSS)
Low risk10th percentile - higher than 10% of all known CVEs
Summary
In the Linux kernel's libceph module, a multiplication overflow during osdmap decoding can lead to incorrect bounds checking and out-of-bounds reads. The fix uses check_mul_overflow() to detect overflow and reject corrupted messages.
Risk Assessment
A malicious CEPH_MSG_OSD_MAP message can cause out-of-bounds reads, potentially leading to information disclosure or system crash.
Recommendation
Update the Linux kernel and implement network filtering from untrusted Ceph monitors.
Original NVD description (English source)
In the Linux kernel, the following vulnerability has been resolved: libceph: Fix multiplication overflow in decode_new_up_state_weight() If a message of type CEPH_MSG_OSD_MAP contains a (maliciously) corrupted osdmap, out-of-bounds memory accesses may occur in decode_new_up_state_weight(). This happens because the bounds check for the new_state part is based on calculating its length depending on a len value read from the incoming message. This calculation may overflow leading to an incorrect bounds check. Subsequently, out-of-bounds reads may occur when decoding this part. This patch switches the multiplication to use check_mul_overflow() to abort processing the osdmap if an overflow occurred. Therefore, osdmaps/messages containing large values for len that result in a multiplication overflow are treated as invalid. [ idryomov: rename new_state_len -> new_state_item_size, formatting ]