Security readout for executives and security teams
Plain-English summary
A malformed or malicious Ceph OSD map can make the Linux kernel’s Ceph library read beyond expected memory boundaries. Successful exploitation could expose kernel memory or crash affected systems, threatening confidentiality and availability. The issue is rated critical at CVSS 9.1.
Executive priority
Treat as an urgent patching and exposure-verification item for Ceph-connected Linux infrastructure. Prioritize systems whose compromise or outage would affect sensitive data or critical services. The critical score warrants prompt action, although the supplied sources do not establish active exploitation.
Technical view
libceph’s decode_pool() trusted an encoded ceph_pg_pool envelope length without checking every decoded or skipped field. A shorter-than-required envelope for its encoding version can cause out-of-bounds reads. Linux stable patches add explicit field-level bounds checks.
Likely exposure
Exposure is limited to Linux systems using libceph and processing Ceph OSD maps. The supplied affected-version data spans multiple kernel lines but does not provide clear distribution package mappings. Confirm exposure against the running kernel and vendor guidance.
Exploitation context
The CVSS vector describes network-reachable, low-complexity exploitation requiring no privileges or user interaction, with high confidentiality and availability impact. The source bundle reports KEV as false and provides no evidence of active exploitation or a public exploit. KEV absence alone does not prove exploitation is impossible.
Researcher notes
The defect is an out-of-bounds read caused by insufficient validation of a versioned ceph_pg_pool envelope. Expected impacts are information disclosure and denial of service, not integrity compromise. The bundle lists several stable backports, but its affected-version presentation is ambiguous and should not replace branch-specific or distribution guidance.
Mitigation direction
- Inventory Linux systems that use libceph and receive Ceph OSD maps.
- Install a vendor-supported kernel containing the applicable Linux stable fix.
- Prioritize reachable Ceph-connected systems and workloads handling sensitive data.
- Follow distribution guidance where packaged kernels do not map cleanly to upstream releases.
Validation and detection
- Record each system’s running kernel version and whether libceph is loaded or actively used.
- Map the running kernel to vendor advisories and the applicable stable commit.
- Confirm the updated running kernel includes explicit per-field decode_pool() bounds checks.
- Monitor kernel and Ceph logs for faults associated with OSD map decoding.
Public sources used
Generated from the cited source records. This long-tail analysis has not been individually reviewed by a named human.
Conservative CVE-to-ATT&CK context
These mappings and lookup hints may be relevant to the vulnerability behavior, CWE, affected product, or exposure path. Glexia-inferred context is not an official MITRE, ATT&CK, CWE, or CVE Program mapping.
ATT&CK lookup starting points
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CVE-2025-71116 mapping review
Open the CVE-to-ATT&CK bridge for reviewed, inferred, or future official mappings tied to this CVE.
Open ATT&CK lookup- Severity
- Critical
- CVSS
- 9.1 (3.1)
- Known Exploited
- No
- Published
Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CNA and ADP enrichment extracted from CVE v5
These fields come from the CVE record and ADP containers, not from Glexia's Take. They preserve time-varying source decisions such as CISA SSVC, KEV status, CVSS metrics, and provider references.
SSVC decision data
CVSS vector scores
1 official scoreWe collect every scored CVSS vector available in the official CNA and ADP containers. When more than one version is present, the table keeps the source vectors side by side instead of collapsing them into the highest score.
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H3.95.2LinuxVulnerability scoring details
Base CVSS 3.1 score
9.1CriticalVector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
Vulnerability timeline
Timeline events are normalized from CVE metadata, CNA source timelines, ADP timelines, and KEV metadata when present.
- CVE reservedCVE Program
The CVE ID was reserved by the assigning CNA.
- CVE publishedCVE Program
The CVE record was published.
- CVE updatedCVE Program
The CVE record metadata indicates this as the latest update time.
ADP provider summaries
Source materials
- CVE List V5 sourceCVE List V5
- https://git.kernel.org/stable/c/d061be4c8040ffb1110d537654a038b8b6ad39d2CVE reference, Linux
- https://git.kernel.org/stable/c/145d140abda80e33331c5781d6603014fa75d258CVE reference, Linux
- https://git.kernel.org/stable/c/c82e39ff67353a5a6cbc07b786b8690bd2c45aaaCVE reference, Linux
- https://git.kernel.org/stable/c/e927ab132b87ba3f076705fc2684d94b24201ed1CVE reference, Linux
- https://git.kernel.org/stable/c/5d0d8c292531fe356c4e94dcfdf7d7212aca9957CVE reference, Linux
- https://git.kernel.org/stable/c/2acb8517429ab42146c6c0ac1daed1f03d2fd125CVE reference, Linux
- https://git.kernel.org/stable/c/8c738512714e8c0aa18f8a10c072d5b01c83db39CVE reference, Linux
Products and packages named in the record
CWE details
CWE links open Glexia weakness intelligence pages with official CWE context, developer remediation guidance, and related CVE mappings.