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NVD / CVE Program· CNA Linux

CVE-2026-90152: smb/server: fix session leak in ksmbd_session_register()

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 03a22a003f41b182245e6c71fe565e277cff7094, 5.16, 55c677619084f9c9fa4146d933cc8ccafc924c87.

Low priority for now. Upgrade to Linux Linux 03a22a003f41b182245e6c71fe565e277cff7094, 5.16, 55c677619084f9c9fa4146d933cc8ccafc924c87 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/server: fix session leak in ksmbd_session_register() See the procedure below: smb2_sess_setup ksmbd_smb2_session_create __session_create atomic_set(&sess->refcnt, 2) hash_add(sessions_table, &sess->hlist, sess->id) ksmbd_session_register xa_store(&conn->sessions, sess->id, sess) // fail ksmbd_user_session_put atomic_dec(&sess->refcnt) // refcnt is 1, session is not freed Remove the session from sessions_table and drop its table reference if xa_store() fails.

—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 21, 2026
EPSS
0.2% · 10th 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 · 0.2%

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  • No public exploit code on record
  • A fix has been released

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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

    • 708c304b583d789957399dd8237f212cf8ad1e4d, f623f627ad2b1dc215ab3b0df53fb05cfd3a1c3b, d270631c21e68fb8016d6e231d022d7023a2df6f, 02f41d88f15d6b7d523e52cc3f87488f57e9265b, 6.4affected
    • f5c779b7ddbda30866cf2a27c63e34158f858c73 and later · before 988f99bfddda4e2d1da5f6e98b237dd85e123ceeaffected · git
    • f5c779b7ddbda30866cf2a27c63e34158f858c73 and later · before 03a22a003f41b182245e6c71fe565e277cff7094affected · git
    • f5c779b7ddbda30866cf2a27c63e34158f858c73 and later · before b967a595fb735d313a8676b2ca6a4cba38506482affected · git
    • f5c779b7ddbda30866cf2a27c63e34158f858c73 and later · before 55c677619084f9c9fa4146d933cc8ccafc924c87affected · git
    • f5c779b7ddbda30866cf2a27c63e34158f858c73 and later · before 99b25b046e47e4904373cfeb445c5483f1633d88affected · git
    • 5.15.145 and later · before 5.16affected · semver
    • 6.1.29 and later · before 6.2affected · semver
    • 6.2.16 and later · before 6.3affected · semver
    • 6.3.2 and later · before 6.4affected · 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 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1
openSUSE:Tumbleweedkernel-sourcebefore 7.2.8-1.17.2.8-1.1

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-2026-90150Sep 17, 2026 · pnfs/blocklayout: Fix device leaks on parse failure
    0Monitor
  • ← EarlierCVE-2026-90151Sep 17, 2026 · NFSv4: remove callback IDR entry on client allocation failure
    39Monitor
  • Later →CVE-2026-90153Sep 17, 2026 · ksmbd: bound smb_check_perm_dacl() ACE walks by DACL size
    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 Linux03a22a003f41b182245e6c71fe565e277cff7094Vendor (CNA)
Linux Linux5.16Vendor (CNA)
Linux Linux55c677619084f9c9fa4146d933cc8ccafc924c87Vendor (CNA)
Linux Linux6.2Vendor (CNA)
Linux Linux6.3Vendor (CNA)
Linux Linux6.4Vendor (CNA)
Linux Linux988f99bfddda4e2d1da5f6e98b237dd85e123ceeVendor (CNA)
Linux Linux99b25b046e47e4904373cfeb445c5483f1633d88Vendor (CNA)
Linux Linuxb967a595fb735d313a8676b2ca6a4cba38506482Vendor (CNA)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)
opensuse:kernel-source7.2.8-1.1 · 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.

No dated events beyond publication.

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. Fix✗ → ✓

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References

Show all references (4 more)

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

All records