libceph: return the handler error from mon_handle_auth_done()
Noroxi assessment
Priority: Monitor (action score 22/100)
- The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
- Probability of exploitation in the next 30 days: 0.31% (FIRST EPSS).
- 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.
- According to CISA the attack is automatable: targets can be found by mass scanning.
- Fixed version: Linux Linux 33908769248b38a5e77cf9292817bb28e641992d, 77229551f2cf72f3e35636db68e6a825b912cf16, 9e0101e57534ef0e7578dd09608a6106736b82e5; cbl2 kernel 5.15.186.1-1 on CBL Mariner 2.0 5.15.200.1-1.
- Severity is disputed: the assigning authority (CNA) scores it 7.5, NVD 5.5.
Low priority for now. Upgrade to Linux Linux 33908769248b38a5e77cf9292817bb28e641992d, 77229551f2cf72f3e35636db68e6a825b912cf16, 9e0101e57534ef0e7578dd09608a6106736b82e5; cbl2 kernel 5.15.186.1-1 on CBL Mariner 2.0 5.15.200.1-1 or later.
Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it
In the Linux kernel, the following vulnerability has been resolved: libceph: return the handler error from mon_handle_auth_done() Currently any error from ceph_auth_handle_reply_done() is propagated via finish_auth() but isn't returned from mon_handle_auth_done(). This results in higher layers learning that (despite the monitor considering us to be successfully authenticated) something went wrong in the authentication phase and reacting accordingly, but msgr2 still trying to proceed with establishing the session in the background. In the case of secure mode this can trigger a WARN in setup_crypto() and later lead to a NULL pointer dereference inside of prepare_auth_signature().
- Published
- Jan 23, 2026
- Updated
- Sep 8, 2026
- EPSS
- 0.3% · 23th percentile
- CWE
- CWE-476
Report tools
Action score
22
Monitor
Low priority for now.
- CVSS
- 22 / 40 · 5.5 / 10
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.3%
CISA SSVC decision
- Exploitation
- none
- Automatable
- yes
- Technical impact
- partial
Vulnrichment: CISA's decision-tree inputs.
CNA vs NVD score
- NVD
- 5.5
- CNA · Linux
- 7.5
- 2.0 point gap
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.
Get told when this record changes
- Not in KEV: no record of exploitation in the wild
- No public exploit code on record
- A fix has been released
If any of these changes, we'll tell you in the daily email digest.
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Noroxi analysis
What does it mean in your environment?
The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.
We use this product, ask for helpAffected systems
Is your version affected?
Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.
| Vendor | Product | CPE |
|---|---|---|
| linux | linux kernel | cpe:2.3:o:linux:linux_kernel |
Affected versions
NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.
- linux linux kernel5.11 and later · before 5.15.198
- linux linux kernel5.16 and later · before 6.1.161
- linux linux kernel6.2 and later · before 6.6.121
- linux linux kernel6.7 and later · before 6.12.66
- linux linux kernel6.13 and later · before 6.18.6
- linux linux kernel6.19
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
- 5.11affected
- cd1a677cad994021b19665ed476aea63f5d54f31 and later · before 77229551f2cf72f3e35636db68e6a825b912cf16affected · git
- cd1a677cad994021b19665ed476aea63f5d54f31 and later · before 33908769248b38a5e77cf9292817bb28e641992daffected · git
- cd1a677cad994021b19665ed476aea63f5d54f31 and later · before e097cd858196b1914309e7e3d79b4fa79383754daffected · git
- cd1a677cad994021b19665ed476aea63f5d54f31 and later · before d2c4a5f6996683f287f3851ef5412797042de7f1affected · git
- cd1a677cad994021b19665ed476aea63f5d54f31 and later · before 9e0101e57534ef0e7578dd09608a6106736b82e5affected · git
- cd1a677cad994021b19665ed476aea63f5d54f31 and later · before e84b48d31b5008932c0a0902982809fbaa1d3b70affected · git
- before 5.11not affected · semver
- 5.15.198 and later · up to and including 5.15.*not affected · semver
- 6.1.161 and later · up to and including 6.1.*not 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 6.1.162-1 | 6.1.162-1 |
| Debian:13 | linux | before 6.12.69-1 | 6.12.69-1 |
| Debian:14 | linux | before 6.18.8-1 | 6.18.8-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2022-0847A flaw was found in the way the "flags" member of the new pipe buffer structure was lacking proper initialization in copy_page_to_iter_pipe KEV89Now
- CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV85Now
- CVE-2016-5195Race condition in mm/gup.c in the Linux kernel 2.x through 4.x before 4.8.3 allows local users to gain privileges by leveraging incorrect haKEV83Now
- CVE-2019-13272In the Linux kernel before 5.1.17, ptrace_link in kernel/ptrace.c mishandles the recording of the credentials of a process that wants to creKEV77This week
- CVE-2013-6282The (1) get_user and (2) put_user API functions in the Linux kernel before 3.5.5 on the v6k and v7 ARM platforms do not validate certain addKEV77This week
- CVE-2013-2094The perf_swevent_init function in kernel/events/core.c in the Linux kernel before 3.8.9 uses an incorrect integer data type, which allows loKEV77This week
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 | 33908769248b38a5e77cf9292817bb28e641992d | Vendor (CNA) |
| Linux Linux | 77229551f2cf72f3e35636db68e6a825b912cf16 | Vendor (CNA) |
| Linux Linux | 9e0101e57534ef0e7578dd09608a6106736b82e5 | Vendor (CNA) |
| Linux Linux | d2c4a5f6996683f287f3851ef5412797042de7f1 | Vendor (CNA) |
| Linux Linux | e097cd858196b1914309e7e3d79b4fa79383754d | Vendor (CNA) |
| Linux Linux | e84b48d31b5008932c0a0902982809fbaa1d3b70 | Vendor (CNA) |
| cbl2 kernel 5.15.186.1-1 on CBL Mariner 2.0 | 5.15.200.1-1 · CBL-Mariner Releases | Microsoft (MSRC) |
| debian:linux | 6.1.162-1 · 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
- none
- Integrity
- none
- Availability
- high · the service can be disrupted
- Attack vector
- Local
- Attack complexity
- Low
- Privileges required
- Low
- User interaction
- None
- Scope
- Unchanged
- Confidentiality impact
- None
- Integrity impact
- None
- Availability impact
- High
Weakness class (CWE)
CWE-476 · NULL Pointer DereferenceCVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
nvd-primary
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.
Change log
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (6 more)Show less
- git.kernel.org/stable/c/77229551f2cf72f3e35636db68e6a825b912cf16
- git.kernel.org/stable/c/9e0101e57534ef0e7578dd09608a6106736b82e5
- git.kernel.org/stable/c/d2c4a5f6996683f287f3851ef5412797042de7f1
- git.kernel.org/stable/c/e097cd858196b1914309e7e3d79b4fa79383754d
- git.kernel.org/stable/c/e84b48d31b5008932c0a0902982809fbaa1d3b70
- cert-portal.siemens.com/productcert/html/ssa-019113.html
Vendor advisories and official records. Exploit/PoC links are deliberately left out.