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NVD / CVE Program· CNA Linux

CVE-2026-46155: smb/client: fix out-of-bounds read in smb2_compound_op()

Noroxi assessment

Priority: Monitor (action score 36/100)

  • 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: 0.47% (FIRST EPSS).
  • Anyone who can reach it over the internet can trigger it. No account or password is required. 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 512d33bc8ea4ea5c19728ee118715f4b1f4d1926, 6.6.140, 8d09328dfda089675e4c049f3f256064a1d1996b; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 512d33bc8ea4ea5c19728ee118715f4b1f4d1926, 6.6.140, 8d09328dfda089675e4c049f3f256064a1d1996b; azl3 kernel 6.6.139.1-1 on Azure Linux 3.0 6.6.141.1-1 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 out-of-bounds read in smb2_compound_op() If a server sends a truncated response but a large OutputBufferLength, and terminates the EA list early, check_wsl_eas() returns success without validating that the entire OutputBufferLength fits within iov_len. Then smb2_compound_op() does: memcpy(idata->wsl.eas, data[0], size[0]); Where size[0] is OutputBufferLength. If iov_len is smaller than size[0], memcpy can read beyond the end of the rsp_iov allocation and leak adjacent kernel heap memory.

CriticalCVSS 9.1 · v3.1—No exploit Fix available
Published
May 28, 2026
Updated
Oct 19, 2026
EPSS
0.4% · 41th percentile

Report tools

JSON

Action score

36

Monitor

Low priority for now.

CVSS
36 / 40 · 9.1 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.4%

CISA SSVC decision

Exploitation
none
Automatable
yes
Technical impact
partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD
—
CNA · Linux
9.1
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.

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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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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

Affected versions

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 6.6.140
  • linux linux kernel6.9 and later · before 6.12.88
  • linux linux kernel6.13 and later · before 6.18.30
  • linux linux kernel6.19 and later · before 7.0.7
  • linux linux kernel7.1

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

    • 6.9affected
    • 7449d736bbbd160c76b01b8fcdf72f58a8757d4b and later · before dffb44b2e06a2908e249f0f93156fc987eee1d1caffected · git
    • ea41367b2a602f602ea6594fc4a310520dcc64f4 and later · before 9b3af35645ff9cd334edc130249f9a2fb2bea25faffected · git
    • ea41367b2a602f602ea6594fc4a310520dcc64f4 and later · before 512d33bc8ea4ea5c19728ee118715f4b1f4d1926affected · git
    • ea41367b2a602f602ea6594fc4a310520dcc64f4 and later · before a16f70a71be4b5a4eccf39a9bf09b47285f4cb7caffected · git
    • ea41367b2a602f602ea6594fc4a310520dcc64f4 and later · before 8d09328dfda089675e4c049f3f256064a1d1996baffected · git
    • 6.6.32 and later · before 6.6.140affected · semver
    • before 6.9not affected · semver
    • 6.6.140 and later · up to and including 6.6.*not affected · semver
    • 6.12.88 and later · up to and including 6.12.*not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.31.1.el10_26.12.0-211.31.1.el10_2

+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-2026-46151May 28, 2026 · usb: usblp: fix heap leak in IEEE 1284 device ID via short response
    22Monitor
  • ← EarlierCVE-2026-46152May 28, 2026 · wifi: mac80211: drop stray 'static' from fast-RX rx_result
    35Monitor
  • Later →CVE-2026-46157May 28, 2026 · ALSA: pcm: oss: Fix data race at accessing runtime.oss.trigger
    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 Linux512d33bc8ea4ea5c19728ee118715f4b1f4d1926Vendor (CNA)
Linux Linux6.6.140Vendor (CNA)
Linux Linux8d09328dfda089675e4c049f3f256064a1d1996bVendor (CNA)
Linux Linux9b3af35645ff9cd334edc130249f9a2fb2bea25fVendor (CNA)
Linux Linuxa16f70a71be4b5a4eccf39a9bf09b47285f4cb7cVendor (CNA)
Linux Linuxdffb44b2e06a2908e249f0f93156fc987eee1d1cVendor (CNA)
azl3 kernel 6.6.139.1-1 on Azure Linux 3.06.6.141.1-1 · CBL-Mariner ReleasesMicrosoft (MSRC)
almalinux:kernel5.14.0-687.22.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k5.14.0-687.22.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-core5.14.0-687.22.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug5.14.0-687.22.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-core5.14.0-687.22.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel5.14.0-687.22.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched5.14.0-687.22.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules5.14.0-687.22.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-core5.14.0-687.22.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra5.14.0-687.22.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel5.14.0-687.22.1.el9_8 · AlmaLinux:9Package registry (OSV)
almalinux:kernel-64k-devel-matched5.14.0-687.22.1.el9_8 · AlmaLinux:9Package registry (OSV)
debian:linux6.12.88-1 · Debian:13Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:5.14.0-687.22.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel0:5.14.0-687.22.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debug-devel-matched0:5.14.0-687.22.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-debuginfo0:5.14.0-687.22.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel0:5.14.0-687.22.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-64k-devel-matched0:5.14.0-687.22.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-debuginfo0:5.14.0-687.22.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel0:5.14.0-687.22.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debug-devel-matched0:5.14.0-687.22.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage registry (OSV)
red hat:kernel-debuginfo0:5.14.0-687.22.1.el9_8 · Red Hat:enterprise_linux:9::appstreamPackage 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).

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

Attack conditions

  • Anyone who can reach it over the internet can trigger it.
  • No account or password is required.
  • 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
Network
Attack complexity
Low
Privileges required
None
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:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/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.

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 (4 more)

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

All records