ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode (CVE-2026-89653) | HOL Guard CVE

Unknown severity · Source severity not reportedCVE-2026-89653

ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode

Answer in brief

CVE-2026-89653 records a Unknown severity vulnerability in ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Analysis pending evidence review

HOL Guard separates source facts from reviewed analysis. See the methodology.

Published Sep 11, 2026Updated Sep 11, 2026Source checked Sep 11, 2026First seen by HOL Sep 11, 2026Material review Sep 11, 2026

Upstream Advisory

Key facts

Risk: Unknown severitySource severity not reported
Exploitation: Not marked as known exploited
Affected software: 2 mapped packages or products
Fix availability: Available

Why this deserves its current priority

A CVSS score is not reported in the current record. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.

Analysis status

Analysis pending evidence review

Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.

Affected scope and exposure questions

The current feed maps Linux/Linux (generic), Linux/Linux (generic). Check affected ranges and fixed versions before updating.

Mapped affected packages and fixed versions
Package	Affected range	Fixed version
Linux/Linuxgeneric	>=d517b3983dd3106ca92d6c5d0d09415a4a09481c <736adee11af36e407ed902264f8b2fb5cf94b62f \|\| >=d517b3983dd3106ca92d6c5d0d09415a4a09481c <4d298880f82c42383b36946bafde7ccf4d804c9b \|\| >=d517b3983dd3106ca92d6c5d0d09415a4a09481c <96c3f5fbb0d5386e7111426f047f98cec4586674 \|\| >=d517b3983dd3106ca92d6c5d0d09415a4a09481c <aedc9053d909508a5f56c3f49f885fc030df4730	736adee11af36e407ed902264f8b2fb5cf94b62f, 4d298880f82c42383b36946bafde7ccf4d804c9b, 96c3f5fbb0d5386e7111426f047f98cec4586674, aedc9053d909508a5f56c3f49f885fc030df4730
Linux/Linuxgeneric	5.15	Not reported

Recommended response

Check inventory. Check lockfiles and deployed manifests for Linux/Linux, Linux/Linux.
Review the reported fix. Update Linux/Linux to 736adee11af36e407ed902264f8b2fb5cf94b62f if you use the affected versions. Test the change in a non-production environment first.

Evidence timeline and material changes

Published upstream
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
Source modified
Sep 11, 2026
Evidence: source:cvelist:source_dates:source-dates:record
First seen by HOL
Sep 11, 2026

Sources and claim methodology

Upstream source description

In the Linux kernel, the following vulnerability has been resolved: ceph: reject export_targets ranks >= CEPH_MAX_MDS in mdsmap decode MDSMap export_targets entries are monitor controlled. check_new_map() uses each entry as a bit number in a fixed stack bitmap, so a rank outside the protocol namespace can make set_bit() write past the end of the array. Reject ranks outside CEPH_MAX_MDS while decoding the map. Do not validate against possible_max_rank here because maps may legitimately reference ranks beyond a temporarily reduced max_mds.

Quoted source text, attributed separately from HOL analysis.