CVE-2026-89794: ksmbd: zero pipe read compound padding
Noroxi assessment
Priority: Monitor (action score 0/100)
- 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: 0.20% (FIRST EPSS).
- Fixed version: Linux Linux 134d980491b435e5cdb3171225e2506ff17867d1, 5.16, 6.1.191.
- Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).
Low priority for now. Upgrade to Linux Linux 134d980491b435e5cdb3171225e2506ff17867d1, 5.16, 6.1.191 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: zero pipe read compound padding Compound response handling extends the last response iov to an eight-byte boundary. smb2_read_pipe() allocates only the payload size, so the alignment padding can expose up to seven bytes of uninitialized kernel heap memory. Allocate the aligned size and clear the unused tail before pinning the response buffer.
- Published
- Sep 16, 2026
- Updated
- Oct 30, 2026
- EPSS
- 0.2% · 11th percentile
- CWE
- —
Report tools
Action score
0
Monitor
Low priority for now.
- CVSS
- 0 / 40 · —
- CISA KEV
- 0 / 30 · Not listed
- EPSS
- 0 / 30 · 0.2%
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.
—
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
- f2283680a80571ca82d710bc6ecd8f8beac67d63, 6.6affected
- 9f297df20d93411c0b4ddad7f88ba04a7cd36e77 and later · before c7516bdf7d2c1a64b14a9f444e2ee58c12c384aeaffected · git
- e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d and later · before 134d980491b435e5cdb3171225e2506ff17867d1affected · git
- e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d and later · before f188a400dd5285fec5a84548fe8dca49eee01155affected · git
- e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d and later · before d83a9de7cecd401c3d3e00ed6371194dcd7313e4affected · git
- e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d and later · before be15b8da4a82cf1e1f9880b2661b90770606eec1affected · git
- e2b76ab8b5c9327ab2dae6da05d0752eb2f4771d and later · before 73f860489e3be2245598d1819226304fc5b87291affected · git
- 6.1.71 and later · before 6.1.191affected · semver
- 5.15.145 and later · before 5.16affected · semver
- before 6.6not 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 | from 0 | — |
| 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 7.2.6-1 | 7.2.6-1 |
Same product
linux: all recordsOther highest-scoring records for the same primary product.
- CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation40Plan
- CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment40Plan
- CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()40Plan
Published before and after this one in the same product
- ← EarlierCVE-2026-89792Sep 16, 2026 · ksmbd: prevent out-of-bounds reads in share config responses28Monitor
- ← EarlierCVE-2026-89793Sep 16, 2026 · ublk: clear VM_MAYWRITE on read-only ublk char device mmap31Monitor
- Later →CVE-2026-89795Sep 16, 2026 · PCI: Allow per function PCI slots to fix slot reset on s39033Monitor
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 | 134d980491b435e5cdb3171225e2506ff17867d1 | Vendor (CNA) |
| Linux Linux | 5.16 | Vendor (CNA) |
| Linux Linux | 6.1.191 | Vendor (CNA) |
| Linux Linux | 73f860489e3be2245598d1819226304fc5b87291 | Vendor (CNA) |
| Linux Linux | be15b8da4a82cf1e1f9880b2661b90770606eec1 | Vendor (CNA) |
| Linux Linux | c7516bdf7d2c1a64b14a9f444e2ee58c12c384ae | Vendor (CNA) |
| Linux Linux | d83a9de7cecd401c3d3e00ed6371194dcd7313e4 | Vendor (CNA) |
| Linux Linux | f188a400dd5285fec5a84548fe8dca49eee01155 | Vendor (CNA) |
| 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.
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).
National notice (Türkiye Cybersecurity Directorate / USOM)
Official security notices citing this record; remediation advice is on the agency's page.
- TR-26-1114 · Sep 17, 2026(Linux Kernel Güvenlik Bildirimi)
Technical details
No CVSS vector for this record, so attack conditions can't be derived.
Weakness class (CWE)
—
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 (5 more)Show less
- git.kernel.org/stable/c/73f860489e3be2245598d1819226304fc5b87291
- git.kernel.org/stable/c/be15b8da4a82cf1e1f9880b2661b90770606eec1
- git.kernel.org/stable/c/c7516bdf7d2c1a64b14a9f444e2ee58c12c384ae
- git.kernel.org/stable/c/d83a9de7cecd401c3d3e00ed6371194dcd7313e4
- git.kernel.org/stable/c/f188a400dd5285fec5a84548fe8dca49eee01155
Vendor advisories and official records. Exploit/PoC links are deliberately left out.