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CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-98453: smb: client: close handle after create-context parsing failure

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: 0.17% (FIRST EPSS).
  • Fixed version: Linux Linux 007b87f6a7c38959ed79cf7d3fd7b3b4eb5f67fd, 5.10.273, 5.15.224; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 007b87f6a7c38959ed79cf7d3fd7b3b4eb5f67fd, 5.10.273, 5.15.224; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.159.1-1 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: smb: client: close handle after create-context parsing failure SMB2_open() accounts a successful CREATE response as a remote open before parsing its create contexts. If smb2_parse_contexts() rejects malformed context data, SMB2_open() returns without closing the handle, leaving the server-side handle open and num_remote_opens elevated. Close the handle after a post-CREATE context parsing failure so the error path releases the remote resource and balances the open count.

—No exploit Fix available
Published
Oct 18, 2026
Updated
Oct 30, 2026
EPSS
0.1% · 7th percentile
CWE
—

Report tools

JSON

Action score

0

Monitor

Low priority for now.

CVSS
0 / 40 · —
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

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  • when exploit code appears or is weaponized
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  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

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Affected 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

    • 6726429c18c62dbf5e96ebbd522f262e016553fb, 6.7affected
    • 13fb0fc4917621f3dfa285a27eaf7151d770b5e5 and later · before d4c05b5cb0a3132453e36a300d45de44bf6783c4affected · git
    • 890bc4fac3c0973a49cac35f634579bebba7fe48 and later · before ee61f1dc516d97afa79908140d0a8c556c2fe90caffected · git
    • 1ae3c59355dc9882e09c020afe8ffbd895ad0f29 and later · before 007b87f6a7c38959ed79cf7d3fd7b3b4eb5f67fdaffected · git
    • 17a0f64cc02d4972e21c733d9f21d1c512963afa and later · before eaa97a196a107d4ef8775df2248181624151812eaffected · git
    • af1689a9b7701d9907dfc84d2a4b57c4bc907144 and later · before 80c67cc71d32ccafc89a29b669243b40d81b930faffected · git
    • af1689a9b7701d9907dfc84d2a4b57c4bc907144 and later · before f09875ff901e933e7b22c913daf51d21e9d93a45affected · git
    • af1689a9b7701d9907dfc84d2a4b57c4bc907144 and later · before cdb36b09fb1f86d638d0afb44d621ed3f7c1d8ebaffected · git
    • af1689a9b7701d9907dfc84d2a4b57c4bc907144 and later · before 566820af017e81497fb5e9d3ad6e7ffe2828bc8baffected · git
    • 5.10.211 and later · before 5.10.273affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxfrom 0—
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.9-17.2.9-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-98451Oct 18, 2026 · smb: client: use finish_no_open() for non-regular inodes
    35Monitor
  • ← EarlierCVE-2026-98452Oct 18, 2026 · smb: client: clean up failed cached directory opens
    0Monitor
  • Later →CVE-2026-98454Oct 18, 2026 · smb: client: fix create context out-of-bounds reads
    32Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux007b87f6a7c38959ed79cf7d3fd7b3b4eb5f67fdVendor (CNA)
Linux Linux5.10.273Vendor (CNA)
Linux Linux5.15.224Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux566820af017e81497fb5e9d3ad6e7ffe2828bc8bVendor (CNA)
Linux Linux6.1.191Vendor (CNA)
Linux Linux6.6.160Vendor (CNA)
Linux Linux80c67cc71d32ccafc89a29b669243b40d81b930fVendor (CNA)
Linux Linuxcdb36b09fb1f86d638d0afb44d621ed3f7c1d8ebVendor (CNA)
Linux Linuxd4c05b5cb0a3132453e36a300d45de44bf6783c4Vendor (CNA)
Linux Linuxeaa97a196a107d4ef8775df2248181624151812eVendor (CNA)
Linux Linuxee61f1dc516d97afa79908140d0a8c556c2fe90cVendor (CNA)
Linux Linuxf09875ff901e933e7b22c913daf51d21e9d93a45Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.159.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · Debian:12Package 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.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 10, 2026+23 d
EPSS, last 120 days

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 researchers

Finders, 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.

All national notices →

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

  1. Exploit maturity— → none
  2. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records