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NVD / CVE Program· CNA Linux

CVE-2026-43112: fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath

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 2d29214448ec0f4e7e18bb1c14dd4a6c07f1c439, 49b1ce6d7cfb6c5a49f68bf5ccfcfb6ba14e63c3, 5.15.209.

Low priority for now. Upgrade to Linux Linux 2d29214448ec0f4e7e18bb1c14dd4a6c07f1c439, 49b1ce6d7cfb6c5a49f68bf5ccfcfb6ba14e63c3, 5.15.209 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: fs/smb/client: fix out-of-bounds read in cifs_sanitize_prepath When cifs_sanitize_prepath is called with an empty string or a string containing only delimiters (e.g., "/"), the current logic attempts to check *(cursor2 - 1) before cursor2 has advanced. This results in an out-of-bounds read. This patch adds an early exit check after stripping prepended delimiters. If no path content remains, the function returns NULL. The bug was identified via manual audit and verified using a standalone test case compiled with AddressSanitizer, which triggered a SEGV on affected inputs.

HighCVSS 8.8 · v3.1—No exploit Fix available
Published
May 6, 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.

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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 you'll hear from us

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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

Affected versions

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

  • linux linux kernel5.16.1 and later · before 6.6.136
  • linux linux kernel6.7 and later · before 6.12.83
  • linux linux kernel6.13 and later · before 6.18.24
  • linux linux kernel6.19 and later · before 6.19.14
  • linux linux kernel5.16
  • linux linux kernel7.0

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

    • 5.16affected
    • c63433a09d6ae4c226fcbc66da4c58fc189fd746 and later · before a2ba20c17de8eb028f96b1d85f119d3d25655bd9affected · git
    • a31080899d5fdafcccf7f39dd214a814a2c82626 and later · before fbced33599653471b4581dfe1abc7b467031f126affected · git
    • a31080899d5fdafcccf7f39dd214a814a2c82626 and later · before 5d4fe469fe7dbff7d874c196bb680a82f2625d95affected · git
    • a31080899d5fdafcccf7f39dd214a814a2c82626 and later · before 2d29214448ec0f4e7e18bb1c14dd4a6c07f1c439affected · git
    • a31080899d5fdafcccf7f39dd214a814a2c82626 and later · before 86f9c23e0814cfdffda9eedf0c591c51ba209010affected · git
    • a31080899d5fdafcccf7f39dd214a814a2c82626 and later · before 49b1ce6d7cfb6c5a49f68bf5ccfcfb6ba14e63c3affected · git
    • a31080899d5fdafcccf7f39dd214a814a2c82626 and later · before 78ec5bf2f589ec7fd8f169394bfeca541b077317affected · git
    • 5.15.11 and later · before 5.15.209affected · semver
    • before 5.16not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
AlmaLinux:10kernelbefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.30.1.el10_26.12.0-211.30.1.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-2026-43110May 6, 2026 · wifi: brcmfmac: validate bsscfg indices in IF events
    35Monitor
  • ← EarlierCVE-2026-43111May 6, 2026 · HID: roccat: fix use-after-free in roccat_report_event
    31Monitor
  • Later →CVE-2026-43114May 6, 2026 · netfilter: nft_set_pipapo_avx2: don't return non-matching entry on expiry
    37Monitor

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 Linux2d29214448ec0f4e7e18bb1c14dd4a6c07f1c439Vendor (CNA)
Linux Linux49b1ce6d7cfb6c5a49f68bf5ccfcfb6ba14e63c3Vendor (CNA)
Linux Linux5.15.209Vendor (CNA)
Linux Linux5d4fe469fe7dbff7d874c196bb680a82f2625d95Vendor (CNA)
Linux Linux78ec5bf2f589ec7fd8f169394bfeca541b077317Vendor (CNA)
Linux Linux86f9c23e0814cfdffda9eedf0c591c51ba209010Vendor (CNA)
Linux Linuxa2ba20c17de8eb028f96b1d85f119d3d25655bd9Vendor (CNA)
Linux Linuxfbced33599653471b4581dfe1abc7b467031f126Vendor (CNA)
almalinux:kernel6.12.0-211.30.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k6.12.0-211.30.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-core6.12.0-211.30.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug6.12.0-211.30.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-core6.12.0-211.30.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel6.12.0-211.30.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched6.12.0-211.30.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules6.12.0-211.30.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-core6.12.0-211.30.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra6.12.0-211.30.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel6.12.0-211.30.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel-matched6.12.0-211.30.1.el10_2 · AlmaLinux:10Package registry (OSV)
debian:linux6.1.176-1 · Debian:12Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel-matched0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debuginfo0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel-matched0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-debuginfo0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel-matched0:6.12.0-211.30.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)

+5

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

  • 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-125 · Out-of-bounds Read

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.

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 (19 more)

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

All records