CVE-2026-98113: ksmbd: rate limit unmapped SID errors
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: 0.15% (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.
- Fixed version: Linux Linux 13af319c1efec0b45fb5c1b16830eb0888b3fd1e, 3005d43143096321cc857645a9d48ef4ffde8bcf, 30dbb08777b9a611d7d9193c040f382fbd0e7562; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Linux Linux 13af319c1efec0b45fb5c1b16830eb0888b3fd1e, 3005d43143096321cc857645a9d48ef4ffde8bcf, 30dbb08777b9a611d7d9193c040f382fbd0e7562; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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
Primary sources: NVD · CVE.org · FIRST EPSS
In the Linux kernel, the following vulnerability has been resolved: ksmbd: rate limit unmapped SID errors A client can include many structurally valid but unmapped SIDs in a DACL. Logging every mapping failure lets one request generate hundreds of kernel error messages. Rate limit the message to prevent an authenticated client from flooding the kernel log.
- Published
- Sep 25, 2026
- Updated
- Oct 28, 2026
- EPSS
- 0.1% · 4th percentile
- CWE
- CWE-770
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 · 0.1%
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 kernel5.15 and later · before 5.15.222
- linux linux kernel6.0 and later · before 6.1.189
- linux linux kernel6.2 and later · before 6.6.158
- linux linux kernel6.7 and later · before 6.12.11
- linux linux kernel6.13 and later · before 6.18.53
- linux linux kernel6.19 and later · before 7.2.7
- linux linux kernel7.3
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
- 5.15affected
- e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and later · before 3005d43143096321cc857645a9d48ef4ffde8bcfaffected · git
- e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and later · before 674aabf554bdaffcf25f145bf32c8b4f510f7916affected · git
- e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and later · before 486876f957456721b5e51af532235db4c6f7bd47affected · git
- e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and later · before 13af319c1efec0b45fb5c1b16830eb0888b3fd1eaffected · git
- e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and later · before 30dbb08777b9a611d7d9193c040f382fbd0e7562affected · git
- e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and later · before 54cb2a909996346ac6a8a3beac96c07b3dcba584affected · git
- e2f34481b24db2fd634b5edb0a5bd0e4d38cc6e9 and later · before feca5e70fc963b088377b20879e8cd8237c2fd7daffected · git
- before 5.15not affected · semver
- 5.15.222 and later · up to and including 5.15.*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 6.1.190-1 | 6.1.190-1 |
| Debian:12 | linux-6.12 | before 6.12.111-1~deb12u1 | 6.12.111-1~deb12u1 |
| Debian:13 | linux | before 6.12.111-1 | 6.12.111-1 |
| Debian:14 | linux | before 7.2.7-1 | 7.2.7-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV90Now
- 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
Published before and after this one in the same product
- ← EarlierCVE-2026-98111Sep 25, 2026 · Bluetooth: btintel: validate version TLV value lengths28Monitor
- ← EarlierCVE-2026-98112Sep 25, 2026 · ksmbd: fix listener task lifetime on netdev events31Monitor
- Later →CVE-2026-98114Sep 25, 2026 · ksmbd: propagate DACL parsing errors22Monitor
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 | 13af319c1efec0b45fb5c1b16830eb0888b3fd1e | Vendor (CNA) |
| Linux Linux | 3005d43143096321cc857645a9d48ef4ffde8bcf | Vendor (CNA) |
| Linux Linux | 30dbb08777b9a611d7d9193c040f382fbd0e7562 | Vendor (CNA) |
| Linux Linux | 486876f957456721b5e51af532235db4c6f7bd47 | Vendor (CNA) |
| Linux Linux | 54cb2a909996346ac6a8a3beac96c07b3dcba584 | Vendor (CNA) |
| Linux Linux | 674aabf554bdaffcf25f145bf32c8b4f510f7916 | Vendor (CNA) |
| Linux Linux | feca5e70fc963b088377b20879e8cd8237c2fd7d | Vendor (CNA) |
| azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 | 6.6.158.1-1 · Release Notes | Microsoft (MSRC) |
| debian:linux | 6.1.190-1 · Debian:12 | Package registry (OSV) |
| debian:linux | 6.12.111-1 · Debian:13 | Package registry (OSV) |
| debian:linux-6.12 | 6.12.111-1~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.
- CVE-2026-981260 days apartsmb/client: validate new EOF for zero range22Monitor
- CVE-2026-23468175 days apartdrm/amdgpu: Limit BO list entry count to prevent resource exhaustion22Monitor
- CVE-2025-37805505 days apartsound/virtio: Fix cancel_sync warnings on uninitialized work_structs22Monitor
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).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-26-1184 · Sep 28, 2026(Linux Kernel Güvenlik Bildirimi)
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-770 · Allocation of Resources Without Limits or ThrottlingCVSS 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.
Attack patterns (CAPEC)
- FloodingCAPEC-125likelihood: High · Medium
- Excessive AllocationCAPEC-130likelihood: Medium · Medium
- XML Ping of the DeathCAPEC-147likelihood: Low · Medium
- Exponential Data ExpansionCAPEC-197likelihood: High · Medium
- Serialized Data Parameter BlowupCAPEC-229likelihood: High · High
- Serialized Data with Nested PayloadsCAPEC-230likelihood: Medium · High
- Oversized Serialized Data PayloadsCAPEC-231likelihood: Medium · High
- HTTP DoSCAPEC-469Low
ATT&CK techniques
- Network Denial of Service:Direct Network FloodT1498.001
- Network Denial of Service:Reflection AmplificationT1498.002
- Endpoint Denial of ServiceT1499
- Endpoint Denial of Service: OS Exhaustion FloodT1499.001
- Endpoint Denial of Service:Service Exhaustion FloodT1499.002
- Endpoint Denial of Service:Application Exhaustion FloodT1499.003
Change log
- CVSS— → 5.5
- Severity— → medium
- Fix✗ → ✓
For records you follow, these changes also arrive as notifications. →
References
Show all references (6 more)Show less
- git.kernel.org/stable/c/3005d43143096321cc857645a9d48ef4ffde8bcf
- git.kernel.org/stable/c/30dbb08777b9a611d7d9193c040f382fbd0e7562
- git.kernel.org/stable/c/486876f957456721b5e51af532235db4c6f7bd47
- git.kernel.org/stable/c/54cb2a909996346ac6a8a3beac96c07b3dcba584
- git.kernel.org/stable/c/674aabf554bdaffcf25f145bf32c8b4f510f7916
- git.kernel.org/stable/c/feca5e70fc963b088377b20879e8cd8237c2fd7d
Vendor advisories and official records. Exploit/PoC links are deliberately left out.