NVD / CVE Program· CNA Linux

CVE-2026-43281: mailbox: Prevent out-of-bounds access in fw_mbox_index_xlate()

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: 0.11% (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.
Fixed version: Linux Linux 01d9a8c2615d436b2b30c19c1afe9fcd5726ff6d, 2662ed331a69c0b551f78af58f12eb629a89a36f, 2c7ff651ec6b660c7c96a36db9328b3232f555d8.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 01d9a8c2615d436b2b30c19c1afe9fcd5726ff6d, 2662ed331a69c0b551f78af58f12eb629a89a36f, 2c7ff651ec6b660c7c96a36db9328b3232f555d8 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: mailbox: Prevent out-of-bounds access in fw_mbox_index_xlate() Although it is guided that `#mbox-cells` must be at least 1, there are many instances of `#mbox-cells = <0>;` in the device tree. If that is the case and the corresponding mailbox controller does not provide `fw_xlate` and of_xlate` function pointers, `fw_mbox_index_xlate()` will be used by default and out-of-bounds accesses could occur due to lack of bounds check in that function.

HighCVSS 7.1 · v3.1—No exploit Fix available

Memory safety

BDU:2026-13232

Published: May 6, 2026
Updated: Nov 6, 2026
EPSS: 0.1% · 1th percentile
CWE: CWE-125

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 28 / 40 · 7.1 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.1%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

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

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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.

Vendor	Product	CPE
linux	linux kernel	cpe:2.3:o:linux:linux_kernel

Affected versions

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

linux linux kernel3.18.1 and later · before 6.1.167
linux linux kernel6.2 and later · before 6.6.130
linux linux kernel6.7 and later · before 6.12.77
linux linux kernel6.13 and later · before 6.18.16
linux linux kernel6.19 and later · before 6.19.6
linux linux kernel3.18

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
- 3.18affected
- 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c and later · before 2c7ff651ec6b660c7c96a36db9328b3232f555d8affected · git
- 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c and later · before ec0874447895b994182a962d2fee9ef075de5efdaffected · git
- 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c and later · before 2662ed331a69c0b551f78af58f12eb629a89a36faffected · git
- 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c and later · before 31c4c67dec3362094a6747a171a4848e98542265affected · git
- 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c and later · before 01d9a8c2615d436b2b30c19c1afe9fcd5726ff6daffected · git
- 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c and later · before 4caae8168d1b808c7d4ff481295292e3f97f90fbaffected · git
- 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c and later · before f50b39fd7c72a8734153644ee945ca0d8b2e65abaffected · git
- 2b6d83e2b8b7de82331a6a1dcd64b51020a6031c and later · before fcd7f96c783626c07ee3ed75fa3739a8a2052310affected · git
- before 3.18not affected · semver

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.1.170-1	6.1.170-1
Debian:13	linux	before 6.12.85-1	6.12.85-1
Debian:14	linux	before 6.19.6-1	6.19.6-1

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-2026-43279May 6, 2026 · ALSA: usb-audio: Add sanity check for OOB writes at silencing
31Monitor
← EarlierCVE-2026-43280May 6, 2026 · drm/xe: Add bounds check on pat_index to prevent OOB kernel read in madvise
28Monitor
Later →CVE-2026-43284May 8, 2026 · xfrm: esp: avoid in-place decrypt on shared skb frags
63This week

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / package	Fixed version	Source
Linux Linux	01d9a8c2615d436b2b30c19c1afe9fcd5726ff6d	Vendor (CNA)
Linux Linux	2662ed331a69c0b551f78af58f12eb629a89a36f	Vendor (CNA)
Linux Linux	2c7ff651ec6b660c7c96a36db9328b3232f555d8	Vendor (CNA)
Linux Linux	31c4c67dec3362094a6747a171a4848e98542265	Vendor (CNA)
Linux Linux	4caae8168d1b808c7d4ff481295292e3f97f90fb	Vendor (CNA)
Linux Linux	ec0874447895b994182a962d2fee9ef075de5efd	Vendor (CNA)
Linux Linux	f50b39fd7c72a8734153644ee945ca0d8b2e65ab	Vendor (CNA)
Linux Linux	fcd7f96c783626c07ee3ed75fa3739a8a2052310	Vendor (CNA)
debian:linux	6.1.170-1 · Debian:12	Package 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.

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).