CVE-2026-68159 libceph: bound pg_{temp,upmap,upmap_items} length to CEPH_PG_MAX_SIZE

In the Linux kernel, the following vulnerability has been resolved: libceph: bound pgtemp,upmap,upmapitems length to CEPHPGMAXSIZE decodepgtemp decodes an user-controlled length but only rejects values large enough to overflow the allocation; it does not bound it to CEPHPGMAXSIZE. The helper back...