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NVD / CVE Program· CNA Linux

CVE-2026-43205: dpaa2-switch: validate num_ifs to prevent out-of-bounds write

Noroxi assessment

Priority: Monitor (action score 31/100)

  • 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: 0.13% (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 89764cf44544e943230f5e03b8c40a90da26537c, 8a5752c6dcc085a3bfc78589925182e4e98468c5, 8b841fd529db9faf8bc678d429d4bf4e98b10900.
  • Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 89764cf44544e943230f5e03b8c40a90da26537c, 8a5752c6dcc085a3bfc78589925182e4e98468c5, 8b841fd529db9faf8bc678d429d4bf4e98b10900 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: dpaa2-switch: validate num_ifs to prevent out-of-bounds write The driver obtains sw_attr.num_ifs from firmware via dpsw_get_attributes() but never validates it against DPSW_MAX_IF (64). This value controls iteration in dpaa2_switch_fdb_get_flood_cfg(), which writes port indices into the fixed-size cfg->if_id[DPSW_MAX_IF] array. When firmware reports num_ifs >= 64, the loop can write past the array bounds. Add a bound check for num_ifs in dpaa2_switch_init(). dpaa2_switch_fdb_get_flood_cfg() appends the control interface (port num_ifs) after all matched ports. When num_ifs == DPSW_MAX_IF and all ports match the flood filter, the loop fills all 64 slots and the control interface write overflows by one entry. The check uses >= because num_ifs == DPSW_MAX_IF is also functionally broken. build_if_id_bitmap() silently drops any ID >= 64: if (id[i] < DPSW_MAX_IF) bmap[id[i] / 64] |= ...

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
May 6, 2026
Updated
Jun 17, 2026
EPSS
0.1% · 3th percentile

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

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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 kernel5.13 and later · before 5.15.202
  • linux linux kernel5.16 and later · before 6.1.165
  • linux linux kernel6.2 and later · before 6.6.128
  • linux linux kernel6.7 and later · before 6.12.75
  • linux linux kernel6.13 and later · before 6.18.16
  • linux linux kernel6.19 and later · before 6.19.6
  • 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

    • 5.13affected
    • 539dda3c5d190c5088b5e57944b1b482fcb464de and later · before a26dda3bae469c8e4e1b1993ad33dafa32d0fc28affected · git
    • 539dda3c5d190c5088b5e57944b1b482fcb464de and later · before a3034a8d56174dd6464c46823438f25797910a8daffected · git
    • 539dda3c5d190c5088b5e57944b1b482fcb464de and later · before b690635d4719214892855b79ce018d4b1672ac96affected · git
    • 539dda3c5d190c5088b5e57944b1b482fcb464de and later · before 8b841fd529db9faf8bc678d429d4bf4e98b10900affected · git
    • 539dda3c5d190c5088b5e57944b1b482fcb464de and later · before 89764cf44544e943230f5e03b8c40a90da26537caffected · git
    • 539dda3c5d190c5088b5e57944b1b482fcb464de and later · before c18493f750208eb4ff1198fc5a02786b8b2d70a6affected · git
    • 539dda3c5d190c5088b5e57944b1b482fcb464de and later · before 8a5752c6dcc085a3bfc78589925182e4e98468c5affected · git
    • before 5.13not affected · semver
    • 5.15.202 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
AlmaLinux:10kernelbefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-64kbefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-64k-corebefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-64k-debugbefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-64k-debug-corebefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-64k-debug-develbefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-64k-debug-devel-matchedbefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-64k-debug-modulesbefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-corebefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-64k-debug-modules-extrabefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-64k-develbefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-64k-devel-matchedbefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-64k-modulesbefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-64k-modules-corebefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-64k-modules-extrabefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-abi-stablelistsbefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-corebefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-cross-headersbefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-debugbefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-debug-corebefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-debug-develbefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-debug-devel-matchedbefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-debug-modulesbefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.el10_2
AlmaLinux:10kernel-debug-modules-corebefore 6.12.0-211.18.1.el10_26.12.0-211.18.1.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-2026-43202May 6, 2026 · fbdev: vt8500lcdfb: fix missing dma_free_coherent()
    22Monitor
  • ← EarlierCVE-2026-43203May 6, 2026 · atm: fore200e: fix use-after-free in tasklets during device removal
    30Monitor
  • Later →CVE-2026-43207May 6, 2026 · media: mtk-mdp: Fix error handling in probe function
    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 Linux89764cf44544e943230f5e03b8c40a90da26537cVendor (CNA)
Linux Linux8a5752c6dcc085a3bfc78589925182e4e98468c5Vendor (CNA)
Linux Linux8b841fd529db9faf8bc678d429d4bf4e98b10900Vendor (CNA)
Linux Linuxa26dda3bae469c8e4e1b1993ad33dafa32d0fc28Vendor (CNA)
Linux Linuxa3034a8d56174dd6464c46823438f25797910a8dVendor (CNA)
Linux Linuxb690635d4719214892855b79ce018d4b1672ac96Vendor (CNA)
Linux Linuxc18493f750208eb4ff1198fc5a02786b8b2d70a6Vendor (CNA)
almalinux:kernel6.12.0-211.18.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k6.12.0-211.18.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-core6.12.0-211.18.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug6.12.0-211.18.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-core6.12.0-211.18.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel6.12.0-211.18.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-devel-matched6.12.0-211.18.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules6.12.0-211.18.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-core6.12.0-211.18.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-debug-modules-extra6.12.0-211.18.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel6.12.0-211.18.1.el10_2 · AlmaLinux:10Package registry (OSV)
almalinux:kernel-64k-devel-matched6.12.0-211.18.1.el10_2 · AlmaLinux:10Package registry (OSV)
debian:linux6.1.170-1 · Debian:12Package registry (OSV)
red hat:kernel-64k-debug-debuginfo0:6.12.0-211.18.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel0:6.12.0-211.18.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debug-devel-matched0:6.12.0-211.18.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-debuginfo0:6.12.0-211.18.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel0:6.12.0-211.18.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-64k-devel-matched0:6.12.0-211.18.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-debuginfo0:6.12.0-211.18.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel0:6.12.0-211.18.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debug-devel-matched0:6.12.0-211.18.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)
red hat:kernel-debuginfo0:6.12.0-211.18.1.el10_2 · Red Hat:enterprise_linux:10.2Package registry (OSV)

+8

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

  • 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
high · data or configuration can be modified
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
High
Availability impact
High

Weakness class (CWE)

CWE-787 · Out-of-bounds Write

CVSS vector

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

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

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

References

Show all references (6 more)

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

All records