CVE-2026-52958

Description

In the Linux kernel, the following vulnerability has been resolved: libceph: Fix potential out-of-bounds access in osdmap_decode() When decoding osd_state and osd_weight from an incoming osdmap in osdmap_decode(), both are decoded for each osd, i.e., map->max_osd times. The ceph_decode_need() check only accounts for sizeof(*map->osd_weight) once. This can potentially result in an out-of-bounds memory access if the incoming message is corrupted such that the max_osd value exceeds the actual content of the osdmap message. This patch fixes the issue by changing the corresponding part in the ceph_decode_need() check to account for map->max_osd*sizeof(*map->osd_weight).

References

• https://git.kernel.org/stable/c/0d2dd7e6bb74fd7712aa73457a4a821906c6863a
• https://git.kernel.org/stable/c/35d0ed82d03e5ee77ea4f31f20e29562a7721649
• https://git.kernel.org/stable/c/36a79759a288961b1ff28a68ec2d1f56f6848098
• https://git.kernel.org/stable/c/3f2575bb7f955d42569d96c3e04fa958a0dcf4b4
• https://git.kernel.org/stable/c/48df98d12b15360cd56af5c1f460307b340c1197