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NVD / CVE Program· CNA Linux

CVE-2026-64382: smb: client: fix double-free in SMB2_open() replay

HighCVSS 8.8 · v3.1—No exploit Fix available

Noroxi assessment

Priority: Monitor (action score 35/100)

  • 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: 0.35% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. A user must open a link or visit a page. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 02bc2896bdc3e29362d6e40d404006944a159c25, 14498ff5ce0f272ce0ef988721413e06b7038972, 3196b5192f246df4272072f61a2f4a3e9967f55d; azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 6.6.145.2-1.

Low priority for now. Upgrade to Linux Linux 02bc2896bdc3e29362d6e40d404006944a159c25, 14498ff5ce0f272ce0ef988721413e06b7038972, 3196b5192f246df4272072f61a2f4a3e9967f55d; azl3 kernel 6.6.144.1-1 on Azure Linux 3.0 6.6.145.2-1 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 double-free in SMB2_open() replay A response-bearing attempt can return a replayable error and free its response buffer. If SMB2_open_init() fails before the next send, cleanup retains the previous buffer type and frees that response again. Reset response bookkeeping before each attempt to prevent the stale free.

Published
Jul 25, 2026
Updated
Oct 19, 2026
EPSS
0.3% · 29th percentile

Report tools

JSON

Action score

35

Monitor

Low priority for now.

CVSS
35 / 40 · 8.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
8.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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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  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • 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.

VendorProduct
linuxlinux kernel

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

    • 6.8affected
    • 433042a91f9373241307725b52de573933ffedbf and later · before 02bc2896bdc3e29362d6e40d404006944a159c25affected · git
    • 4f1fffa2376922f3d1d506e49c0fd445b023a28e and later · before 3196b5192f246df4272072f61a2f4a3e9967f55daffected · git
    • 4f1fffa2376922f3d1d506e49c0fd445b023a28e and later · before 14498ff5ce0f272ce0ef988721413e06b7038972affected · git
    • 4f1fffa2376922f3d1d506e49c0fd445b023a28e and later · before ff2d30927bc3bf3c629f0768d2068096e64ef5ceaffected · git
    • 4f1fffa2376922f3d1d506e49c0fd445b023a28e and later · before b55e182f2324bc6a604c21a47aa6c448f719a532affected · git
    • 6.6.32 and later · before 6.6.145affected · semver
    • before 6.8not affected · semver
    • 6.6.145 and later · up to and including 6.6.*not affected · semver
    • 6.12.96 and later · up to and including 6.12.*not affected · semver
Affected versions · NVD (5)

NVD version ranges (for catalog products). Add the product to your stack with a version and matching uses these.

  • linux linux kernel6.6.32 and later · before 6.6.145
  • linux linux kernel6.8.1 and later · before 6.12.96
  • linux linux kernel6.13 and later · before 6.18.39
  • linux linux kernel6.19 and later · before 7.1.4
  • linux linux kernel6.8

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linux-6.12before 6.12.100-1~deb12u16.12.100-1~deb12u1
Debian:13linuxbefore 6.12.96-16.12.96-1
Debian:14linuxbefore 7.1.4-17.1.4-1
Red Hat:enterprise_linux_eus:10.0kernelbefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64kbefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-corebefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-debugbefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-debug-corebefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-debug-debuginfobefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-debug-develbefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-debug-devel-matchedbefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-debug-modulesbefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-debug-modules-corebefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-debug-modules-extrabefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-debuginfobefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-develbefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-devel-matchedbefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-modulesbefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-modules-corebefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-64k-modules-extrabefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-abi-stablelistsbefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-corebefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-debugbefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0
Red Hat:enterprise_linux_eus:10.0kernel-debug-corebefore 0:6.12.0-55.105.1.el10_00:6.12.0-55.105.1.el10_0

+96

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-31431crypto: algif_aead - Revert to operating out-of-placeKEV
    90Now
  • 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…KEV
    89Now
  • CVE-2021-22555Heap Out-Of-Bounds Write in Netfilter IP6T_SO_SET_REPLACEKEV
    85Now

Published before and after this one in the same product

  • ← EarlierCVE-2026-64380Jul 25, 2026 · smb: client: harden POSIX SID length parsing
    32Monitor
  • ← EarlierCVE-2026-64381Jul 25, 2026 · smb: client: Fix next buffer leak in receive_encrypted_standard()
    31Monitor
  • Later →CVE-2026-64383Jul 25, 2026 · smb: client: fix double-free in SMB2_flush() replay
    39Monitor

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 Linux02bc2896bdc3e29362d6e40d404006944a159c25Vendor (CNA)
Linux Linux14498ff5ce0f272ce0ef988721413e06b7038972Vendor (CNA)
Linux Linux3196b5192f246df4272072f61a2f4a3e9967f55dVendor (CNA)
Linux Linux6.6.145Vendor (CNA)
Linux Linuxb55e182f2324bc6a604c21a47aa6c448f719a532Vendor (CNA)
Linux Linuxff2d30927bc3bf3c629f0768d2068096e64ef5ceVendor (CNA)
azl3 kernel 6.6.144.1-1 on Azure Linux 3.06.6.145.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
debian:linux6.12.96-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.100-1~deb12u1 · Debian:12Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-570.141.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-570.141.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-570.141.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-570.141.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-570.141.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-570.141.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-570.141.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-570.141.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-570.141.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-debuginfo0:5.14.0-570.141.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-aarch640:5.14.0-570.141.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage registry (OSV)
red hat:kernel-debuginfo-common-ppc64le0:5.14.0-570.141.1.el9_6 · Red Hat:rhel_eus:9.6::appstreamPackage 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).

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

  • CVE-2026-643830 days apartsmb: client: fix double-free in SMB2_flush() replay
    39Monitor
  • CVE-2026-643840 days apartsmb: client: fix change notify replay double-free
    39Monitor
  • CVE-2026-643850 days apartsmb: client: fix double-free in SMB2_ioctl() replay
    39Monitor
  • CVE-2026-643860 days apartsmb: client: fix query_info() replay double-free
    39Monitor
  • CVE-2026-643870 days apartsmb: client: fix query directory replay double-free
    39Monitor
  • CVE-2026-638886 days apartscsi: target: iscsi: Fix CRC overread and double-free in iscsit_handle_text_cmd()
    39Monitor

Not on record for this CVE: patch commit or PR link · researcher credit · public bounty program.

Technical details

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • A user must open a link or visit a page.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
Required
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

CWE-415 · Double Free

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

nvd-secondary

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.

References

Show all references (4 more)

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

All records