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

CVE-2026-98172: smb: client: fix smbd_connection leak on cifs_get_tcp_session() error

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 3164402c58940ff58a3cecdb026405f07b0253af, 45a97df1b7fe6c1ca5493f8fb5284203991aeeb9, 5c908e49d349266dff0c86dda6a05df0ff19b824; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.

Low priority for now. Upgrade to Linux Linux 3164402c58940ff58a3cecdb026405f07b0253af, 45a97df1b7fe6c1ca5493f8fb5284203991aeeb9, 5c908e49d349266dff0c86dda6a05df0ff19b824; 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: smb: client: fix smbd_connection leak on cifs_get_tcp_session() error When an RDMA connection is successfully established via smbd_get_connection() but cifs_get_tcp_session() later fails (e.g. kthread_create() returns an error), the error path frees tcp_ses without first destroying the smbd_connection. Fix this by calling smbd_destroy() in the out_err cleanup path before kfree(tcp_ses). smbd_destroy() safely handles the case where smbd_conn is NULL, so it can be called unconditionally.

—No exploit Fix available
Published
Oct 6, 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%

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

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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?

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.

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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

    • 4.16affected
    • 2f8946464b11822169b9f10c7cf58a2440b51d54 and later · before c295f6505aec085d73e8dcea9f648c8af1b9da8caffected · git
    • 2f8946464b11822169b9f10c7cf58a2440b51d54 and later · before 45a97df1b7fe6c1ca5493f8fb5284203991aeeb9affected · git
    • 2f8946464b11822169b9f10c7cf58a2440b51d54 and later · before 3164402c58940ff58a3cecdb026405f07b0253afaffected · git
    • 2f8946464b11822169b9f10c7cf58a2440b51d54 and later · before e3344bb0ff5ec8a276f42239e140f5442841ef23affected · git
    • 2f8946464b11822169b9f10c7cf58a2440b51d54 and later · before 5c908e49d349266dff0c86dda6a05df0ff19b824affected · git
    • 2f8946464b11822169b9f10c7cf58a2440b51d54 and later · before 928edc4bd6a617caabeb575fc13c254d9df623c4affected · git
    • 2f8946464b11822169b9f10c7cf58a2440b51d54 and later · before b26a3fcf2f1c2cadba400290b639f01395db8fc8affected · git
    • 2f8946464b11822169b9f10c7cf58a2440b51d54 and later · before e75c96157d45e498970158c8f7373d90102e33b9affected · git
    • before 4.16not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.8-17.2.8-1
openSUSE:Tumbleweedkernel-sourcebefore 7.2.10-1.17.2.10-1.1

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-2026-98170Oct 6, 2026 · smb: client: fix OOB struct field reads in move_smb2_ea_to_cifs()
    0Monitor
  • ← EarlierCVE-2026-98171Oct 6, 2026 · smb: client: fix next_buffer UAF and NextCommand bounds in compound PDUs
    35Monitor
  • Later →CVE-2026-98173Oct 6, 2026 · smb: client: fix use-after-free of iface in cifs_try_adding_channels()
    30Monitor

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 Linux3164402c58940ff58a3cecdb026405f07b0253afVendor (CNA)
Linux Linux45a97df1b7fe6c1ca5493f8fb5284203991aeeb9Vendor (CNA)
Linux Linux5c908e49d349266dff0c86dda6a05df0ff19b824Vendor (CNA)
Linux Linux928edc4bd6a617caabeb575fc13c254d9df623c4Vendor (CNA)
Linux Linuxb26a3fcf2f1c2cadba400290b639f01395db8fc8Vendor (CNA)
Linux Linuxc295f6505aec085d73e8dcea9f648c8af1b9da8cVendor (CNA)
Linux Linuxe3344bb0ff5ec8a276f42239e140f5442841ef23Vendor (CNA)
Linux Linuxe75c96157d45e498970158c8f7373d90102e33b9Vendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux7.2.8-1 · Debian:14Package registry (OSV)
debian:linux-6.126.12.113-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:kernel-source7.2.10-1.1 · openSUSE:TumbleweedPackage 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 8, 2026+33 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).

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