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NVD / CVE Program· CNA Linux

CVE-2025-38728: smb3: fix for slab out of bounds on mount to ksmbd

Noroxi assessment

Priority: Monitor (action score 28/100)

  • 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).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • According to CISA the attack is automatable: targets can be found by mass scanning.
  • Fixed version: Linux Linux 248c1142f09478d6cb8151510cbf4ac2673c8ac5, 7d34ec36abb84fdfb6632a0f2cbda90379ae21fc, 8de33d4d72e8fae3502ec3850bd7b14e7c7328b6; azl3 kernel 6.6.96.2-2 on Azure Linux 3.0 6.6.104.2-1; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes.
  • Severity is disputed: the assigning authority (CNA) scores it 9.1, NVD 7.1.

Low priority for now. Upgrade to Linux Linux 248c1142f09478d6cb8151510cbf4ac2673c8ac5, 7d34ec36abb84fdfb6632a0f2cbda90379ae21fc, 8de33d4d72e8fae3502ec3850bd7b14e7c7328b6; azl3 kernel 6.6.96.2-2 on Azure Linux 3.0 6.6.104.2-1; cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0 Release Notes 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: smb3: fix for slab out of bounds on mount to ksmbd With KASAN enabled, it is possible to get a slab out of bounds during mount to ksmbd due to missing check in parse_server_interfaces() (see below): BUG: KASAN: slab-out-of-bounds in parse_server_interfaces+0x14ee/0x1880 [cifs] Read of size 4 at addr ffff8881433dba98 by task mount/9827 CPU: 5 UID: 0 PID: 9827 Comm: mount Tainted: G OE 6.16.0-rc2-kasan #2 PREEMPT(voluntary) Tainted: [O]=OOT_MODULE, [E]=UNSIGNED_MODULE Hardware name: Dell Inc. Precision Tower 3620/0MWYPT, BIOS 2.13.1 06/14/2019 Call Trace: <TASK> dump_stack_lvl+0x9f/0xf0 print_report+0xd1/0x670 __virt_addr_valid+0x22c/0x430 ? parse_server_interfaces+0x14ee/0x1880 [cifs] ? kasan_complete_mode_report_info+0x2a/0x1f0 ? parse_server_interfaces+0x14ee/0x1880 [cifs] kasan_report+0xd6/0x110 parse_server_interfaces+0x14ee/0x1880 [cifs] __asan_report_load_n_noabort+0x13/0x20 parse_server_interfaces+0x14ee/0x1880 [cifs] ? __pfx_parse_server_interfaces+0x10/0x10 [cifs] ? trace_hardirqs_on+0x51/0x60 SMB3_request_interfaces+0x1ad/0x3f0 [cifs] ? __pfx_SMB3_request_interfaces+0x10/0x10 [cifs] ? SMB2_tcon+0x23c/0x15d0 [cifs] smb3_qfs_tcon+0x173/0x2b0 [cifs] ? __pfx_smb3_qfs_tcon+0x10/0x10 [cifs] ? cifs_get_tcon+0x105d/0x2120 [cifs] ? do_raw_spin_unlock+0x5d/0x200 ? cifs_get_tcon+0x105d/0x2120 [cifs] ? __pfx_smb3_qfs_tcon+0x10/0x10 [cifs] cifs_mount_get_tcon+0x369/0xb90 [cifs] ? dfs_cache_find+0xe7/0x150 [cifs] dfs_mount_share+0x985/0x2970 [cifs] ? check_path.constprop.0+0x28/0x50 ? save_trace+0x54/0x370 ? __pfx_dfs_mount_share+0x10/0x10 [cifs] ? __lock_acquire+0xb82/0x2ba0 ? __kasan_check_write+0x18/0x20 cifs_mount+0xbc/0x9e0 [cifs] ? __pfx_cifs_mount+0x10/0x10 [cifs] ? do_raw_spin_unlock+0x5d/0x200 ? cifs_setup_cifs_sb+0x29d/0x810 [cifs] cifs_smb3_do_mount+0x263/0x1990 [cifs]

HighCVSS 7.1 · v3.1—No exploit Fix available
Published
Sep 4, 2025
Updated
Oct 30, 2026
EPSS
0.3% · 29th percentile

Report tools

JSON

Action score

28

Monitor

Low priority for now.

CVSS
28 / 40 · 7.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.3%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
7.1
CNA · Linux
9.1
2.0 point gap

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

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

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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 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.

VendorProduct
linuxlinux kernel
debiandebian linux

Affected versions

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

  • debian debian linux11.0
  • linux linux kernel6.2 and later · before 6.6.103
  • linux linux kernel6.7 and later · before 6.12.43
  • linux linux kernel6.13 and later · before 6.15.11
  • linux linux kernel4.18.1 and later · before 6.1.149
  • linux linux kernel6.16 and later · before 6.16.2
  • linux linux kernel4.18
  • linux linux kernel6.17

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

    • 4.18affected
    • fe856be475f7cf5ffcde57341d175ce9fd09434b and later · before 248c1142f09478d6cb8151510cbf4ac2673c8ac5affected · git
    • fe856be475f7cf5ffcde57341d175ce9fd09434b and later · before 9bdb8e98a0073c73ab3e6c631ec78877ceb64565affected · git
    • fe856be475f7cf5ffcde57341d175ce9fd09434b and later · before a0620e1525663edd8c4594f49fb75fe5be4724b0affected · git
    • fe856be475f7cf5ffcde57341d175ce9fd09434b and later · before 8de33d4d72e8fae3502ec3850bd7b14e7c7328b6affected · git
    • fe856be475f7cf5ffcde57341d175ce9fd09434b and later · before a542f93a123555d09c3ce8bc947f7b56ad8e6463affected · git
    • fe856be475f7cf5ffcde57341d175ce9fd09434b and later · before f6eda5b0e8f8123564c5b34f5801d63243032eacaffected · git
    • fe856be475f7cf5ffcde57341d175ce9fd09434b and later · before 7d34ec36abb84fdfb6632a0f2cbda90379ae21fcaffected · git
    • before 4.18not affected · semver
    • 5.15.224 and later · up to and including 5.15.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.153-16.1.153-1
Debian:13linuxbefore 6.12.43-16.12.43-1
Debian:14linuxbefore 6.16.3-16.16.3-1
openSUSE:Leap 16.0dtb-aarch64before 6.12.0-160000.8.16.12.0-160000.8.1
openSUSE:Leap 16.0kernel-64kbbefore 6.12.0-160000.8.16.12.0-160000.8.1
openSUSE:Leap 16.0kernel-defaultbefore 6.12.0-160000.8.16.12.0-160000.8.1
openSUSE:Leap 16.0kernel-default-basebefore 6.12.0-160000.8.1.160000.2.56.12.0-160000.8.1.160000.2.5
openSUSE:Leap 16.0kernel-docsbefore 6.12.0-160000.8.16.12.0-160000.8.1
openSUSE:Leap 16.0kernel-kvmsmallbefore 6.12.0-160000.8.16.12.0-160000.8.1
openSUSE:Leap 16.0kernel-obs-buildbefore 6.12.0-160000.8.16.12.0-160000.8.1
openSUSE:Leap 16.0kernel-obs-qabefore 6.12.0-160000.8.16.12.0-160000.8.1
openSUSE:Leap 16.0kernel-rtbefore 6.12.0-160000.8.16.12.0-160000.8.1
openSUSE:Leap 16.0kernel-sourcebefore 6.12.0-160000.8.16.12.0-160000.8.1
openSUSE:Leap 16.0kernel-symsbefore 6.12.0-160000.8.16.12.0-160000.8.1
openSUSE:Leap 16.0kernel-zfcpdumpbefore 6.12.0-160000.8.16.12.0-160000.8.1
SUSE:Linux Enterprise Server 16.0kernel-docsbefore 6.12.0-160000.8.16.12.0-160000.8.1
SUSE:Linux Enterprise Server 16.0kernel-kvmsmallbefore 6.12.0-160000.8.16.12.0-160000.8.1
SUSE:Linux Enterprise Server 16.0kernel-obs-qabefore 6.12.0-160000.8.16.12.0-160000.8.1
SUSE:Linux Enterprise Server 16.0kernel-symsbefore 6.12.0-160000.8.16.12.0-160000.8.1
SUSE:Linux Enterprise Server 16.0kernel-zfcpdumpbefore 6.12.0-160000.8.16.12.0-160000.8.1
SUSE:Linux Micro 6.2kernel-64kbbefore 6.12.0-160000.8.16.12.0-160000.8.1
SUSE:Linux Micro 6.2kernel-defaultbefore 6.12.0-160000.8.16.12.0-160000.8.1
SUSE:Linux Micro 6.2kernel-default-basebefore 6.12.0-160000.8.1.160000.2.56.12.0-160000.8.1.160000.2.5
SUSE:Linux Micro 6.2kernel-rtbefore 6.12.0-160000.8.16.12.0-160000.8.1

+2

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-2025-38726Sep 4, 2025 · net: ftgmac100: fix potential NULL pointer access in ftgmac100_phy_disconnect
    22Monitor
  • ← EarlierCVE-2025-38727Sep 4, 2025 · netlink: avoid infinite retry looping in netlink_unicast()
    22Monitor
  • Later →CVE-2025-38729Sep 4, 2025 · ALSA: usb-audio: Validate UAC3 power domain descriptors, too
    31Monitor

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 Linux248c1142f09478d6cb8151510cbf4ac2673c8ac5Vendor (CNA)
Linux Linux7d34ec36abb84fdfb6632a0f2cbda90379ae21fcVendor (CNA)
Linux Linux8de33d4d72e8fae3502ec3850bd7b14e7c7328b6Vendor (CNA)
Linux Linux9bdb8e98a0073c73ab3e6c631ec78877ceb64565Vendor (CNA)
Linux Linuxa0620e1525663edd8c4594f49fb75fe5be4724b0Vendor (CNA)
Linux Linuxa542f93a123555d09c3ce8bc947f7b56ad8e6463Vendor (CNA)
Linux Linuxf6eda5b0e8f8123564c5b34f5801d63243032eacVendor (CNA)
azl3 kernel 6.6.96.2-2 on Azure Linux 3.06.6.104.2-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
cbl2 kernel 5.15.202.1-1 on CBL-Mariner 2.0Release NotesMicrosoft (MSRC)
debian:linux6.1.153-1 · Debian:12Package registry (OSV)
opensuse:dtb-aarch646.12.0-160000.8.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-64kb6.12.0-160000.8.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default6.12.0-160000.8.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-default-base6.12.0-160000.8.1.160000.2.5 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-docs6.12.0-160000.8.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-kvmsmall6.12.0-160000.8.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-build6.12.0-160000.8.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-obs-qa6.12.0-160000.8.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-rt6.12.0-160000.8.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-source6.12.0-160000.8.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-syms6.12.0-160000.8.1 · openSUSE:Leap 16.0Package registry (OSV)
opensuse:kernel-zfcpdump6.12.0-160000.8.1 · openSUSE:Leap 16.0Package registry (OSV)
suse:kernel-64kb6.12.0-160000.8.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-default6.12.0-160000.8.1 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-default-base6.12.0-160000.8.1.160000.2.5 · SUSE:Linux Micro 6.2Package registry (OSV)
suse:kernel-docs6.12.0-160000.8.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-kvmsmall6.12.0-160000.8.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-obs-build6.12.0-160000.8.1 · SUSE:Linux Micro Extras 6.2Package registry (OSV)
suse:kernel-obs-qa6.12.0-160000.8.1 · SUSE:Linux Enterprise Server 16.0Package registry (OSV)
suse:kernel-rt6.12.0-160000.8.1 · SUSE:Linux Micro 6.2Package registry (OSV)

+3

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.

No history yet (it accumulates with the daily EPSS job).

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

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
none
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
None
Availability impact
High

Weakness class (CWE)

CWE-125 · Out-of-bounds Read

CVSS vector

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

nvd-primary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

ATT&CK techniques

—

Change log

  1. SSVC exploitation— → none
  2. Fix✗ → ✓

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

References

Show all references (8 more)

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

All records