libceph: remove debugfs files before client teardown
In the Linux kernel, the following vulnerability has been resolved: libceph: remove debugfs files before client teardown ceph_destroy_client() tears down the monitor client before removing the per-client debugfs files. A concurrent read of the monmap debugfs file can enter monmap_show() after ceph_monc_stop() has freed monc->monmap, triggering a use-after-free. Remove the debugfs files before stopping the OSD and monitor clients. debugfs_remove() drains active handlers and prevents new accesses, so the debugfs callbacks can no longer race the rest of client teardown.
- Published
- Aug 10, 2026
- Updated
- Aug 19, 2026
- EPSS
- 0.1% · 2th percentile
- CWE
- —
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Report tools
Action score
31
Monitor
Low priority for now.
- CVSS
- 31 / 40 · 7.8 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.1%
CNA vs NVD score
- NVD
- —
- CNA · Linux
- 7.8
- NVD has not scored this yet; the score shown is the CNA’s.
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Affected systems
—
Versions reported by the vendor
Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.
Linux Linux
- 2.6.34affected
- 76aa844d5b2fb8c839180d3f5874e333b297e5fd and later · before ac78549d186090ee7125d28c3a8c376573b36194affected · git
- 76aa844d5b2fb8c839180d3f5874e333b297e5fd and later · before 463a264e9094384112a5c8b46f0a9ddaf8566904affected · git
- 76aa844d5b2fb8c839180d3f5874e333b297e5fd and later · before fe46b7e06f14f6f94766832df309b249cb689d27affected · git
- 76aa844d5b2fb8c839180d3f5874e333b297e5fd and later · before fc1010e7e0204ece6cc0f9af4f473e9553535eabaffected · git
- 76aa844d5b2fb8c839180d3f5874e333b297e5fd and later · before d3dc8889d39a676bf840132bd5c5c48cb0daba23affected · git
- 76aa844d5b2fb8c839180d3f5874e333b297e5fd and later · before 8f5a3abc54ba24dbceb14cc3a719908c4f688091affected · git
- 76aa844d5b2fb8c839180d3f5874e333b297e5fd and later · before b9fedda2f628e030384228de0dafc574b7fb0c2faffected · git
- 76aa844d5b2fb8c839180d3f5874e333b297e5fd and later · before e4c804726c4afce3ba648b982d564f6af2cfa328affected · git
- before 2.6.34not affected · semver
Package-level exposure
OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.
| Ecosystem | Package | Affected range | Fix |
|---|---|---|---|
| Debian:12 | linux | before 6.1.187-1 | 6.1.187-1 |
| Debian:12 | linux-6.12 | before 6.12.101-1~deb12u1 | 6.12.101-1~deb12u1 |
| Debian:13 | linux | before 6.12.101-1 | 6.12.101-1 |
| Debian:14 | linux | before 7.1.6-1 | 7.1.6-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
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Remediation
Which version to upgrade to
Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.
| Product / package | Fixed version | Source |
|---|---|---|
| Linux Linux | 463a264e9094384112a5c8b46f0a9ddaf8566904 | Vendor (CNA) |
| Linux Linux | 8f5a3abc54ba24dbceb14cc3a719908c4f688091 | Vendor (CNA) |
| Linux Linux | ac78549d186090ee7125d28c3a8c376573b36194 | Vendor (CNA) |
| Linux Linux | b9fedda2f628e030384228de0dafc574b7fb0c2f | Vendor (CNA) |
| Linux Linux | d3dc8889d39a676bf840132bd5c5c48cb0daba23 | Vendor (CNA) |
| Linux Linux | e4c804726c4afce3ba648b982d564f6af2cfa328 | Vendor (CNA) |
| Linux Linux | fc1010e7e0204ece6cc0f9af4f473e9553535eab | Vendor (CNA) |
| Linux Linux | fe46b7e06f14f6f94766832df309b249cb689d27 | Vendor (CNA) |
| azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 | 6.6.150.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| debian:linux | 6.1.187-1 · Debian:12 | Package registry (OSV) |
| debian:linux-6.12 | 6.12.101-1~deb12u1 · Debian:12 | Package registry (OSV) |
Exploit status
No known public exploit
No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.
Research context
For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.
Timeline
From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.
No dated events beyond publication.
FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).
Patch and commit links
Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.
No commit or PR link among the references.
Credits
All researchersFinders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.
No credits in the CNA record.
Variant candidates
Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.
No nightly-computed relations.
Chain candidates
An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.
—
Bug bounty scope
No known public program.
Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).
Technical details
Attack conditions
- Someone with local access to the system can trigger it.
- A low-privileged account is enough.
- No user action is required.
- No special conditions are required; it is repeatable.
If successful
- Confidentiality
- high · data can be read
- Integrity
- high · data or configuration can be modified
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- High
- Integrity impact
- High
- Availability impact
- High
Weakness class (CWE)
—
CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
nvd-secondary
Attack context
MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.
MITRE has no CAPEC/ATT&CK mapping for this CWE.
Noroxi analysis
No Noroxi analysis for this record yet
We don't hand-write analysis for all 385,000+ vulnerabilities; that wouldn't be honest. For notable, high-impact vulnerabilities our team writes the mechanism, detection and remediation steps.
We use this product, ask for helpChange log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
- git.kernel.org/stable/c/463a264e9094384112a5c8b46f0a9ddaf8566904
- git.kernel.org/stable/c/8f5a3abc54ba24dbceb14cc3a719908c4f688091
- git.kernel.org/stable/c/ac78549d186090ee7125d28c3a8c376573b36194
- git.kernel.org/stable/c/b9fedda2f628e030384228de0dafc574b7fb0c2f
- git.kernel.org/stable/c/d3dc8889d39a676bf840132bd5c5c48cb0daba23
- git.kernel.org/stable/c/e4c804726c4afce3ba648b982d564f6af2cfa328
- git.kernel.org/stable/c/fc1010e7e0204ece6cc0f9af4f473e9553535eab
- git.kernel.org/stable/c/fe46b7e06f14f6f94766832df309b249cb689d27
Vendor advisories and official records. Exploit/PoC links are deliberately left out.