CRITICAL: CVE-2026-52958 (CVSS 9.1) — multiple products

CVE: CVE-2026-52958

CVSS: 9.1 (3.1) — CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H

Severity: CRITICAL

Status: Critical advisory

Affected

_See vendor advisory_

Summary

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_osdsizeof(map->osd_weight).

Verified Sources

• NVD entry
• GitHub Advisory
• MITRE

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
• https://git.kernel.org/stable/c/8713bbc4b2b9ad78f803978e54b7e49dd21bd9be
• https://git.kernel.org/stable/c/e7187f33c02488697ec0d01d82bf7a3f8deaba8f
• https://git.kernel.org/stable/c/ee933694645dac062d65fc2743f92bc06fa0db6b

_Validated by the Lyrie Threat Intelligence Pipeline — 3 independent sources confirmed before publication. No speculation._