CVE-2026-43205

Local memory corruption via unchecked interface count

Published May 6, 2026 · Updated May 6, 2026

Out-of-bounds write in affected Linux kernel releases beginning with 5.13 allows local users to corrupt kernel memory. The driver accepts firmware-supplied sw_attr.num_ifs without checking the 64-entry DPSW_MAX_IF limit, then dpaa2_switch_fdb_get_flood_cfg() uses it to fill cfg->if_id. Reachability requires a DPAA2 DPSW device whose firmware reports at least 64 interfaces and, at exactly 64, a flood filter matching every port.

CVSS severity7.8
High
EPSS probability0.14%
Next 30 days · Sep 16, 2026
Known exploitationUnconfirmed
Based on sourced intelligence
Hinoki checkNot available
Coverage for this vulnerability

See if you're affected

Explore vulnerability checks for your environment with Hinoki.

Book a demo

Summary

What happened

Out-of-bounds write in affected Linux kernel releases beginning with 5.13 allows local users to corrupt kernel memory. The driver accepts firmware-supplied sw_attr.num_ifs without checking the 64-entry DPSW_MAX_IF limit, then dpaa2_switch_fdb_get_flood_cfg() uses it to fill cfg->if_id. Reachability requires a DPAA2 DPSW device whose firmware reports at least 64 interfaces and, at exactly 64, a flood filter matching every port.

The record

CVE
CVE-2026-43205
Published
May 6, 2026
Updated
May 6, 2026
Vendor
The Linux Kernel Organization
Product
Linux Kernel
Classifications
CWE-787, T1068
Attack vector
local
Privileges
authenticated

Timeline

How it unfolded

  1. May 6, 2026CVE publishedPublication date reported by the CVE source.
  2. May 6, 2026Record updatedLatest update available in the CVE record.

Exploitability

Present is not the same as exploitable

Compare your product and version with the public record. A matching version still requires validation against your environment.

Is a vulnerable build present?

Compare these published version ranges with your installed build and any vendor patches.

  1. Affected versionversion=5.13
  2. Affected versionversion=539dda3c5d190c5088b5e57944b1b482fcb464de <89764cf44544e943230f5e03b8c40a90da26537c
  3. Affected versionversion=539dda3c5d190c5088b5e57944b1b482fcb464de <8a5752c6dcc085a3bfc78589925182e4e98468c5
  4. Affected versionversion=539dda3c5d190c5088b5e57944b1b482fcb464de <8b841fd529db9faf8bc678d429d4bf4e98b10900
  5. Affected versionversion=539dda3c5d190c5088b5e57944b1b482fcb464de <a26dda3bae469c8e4e1b1993ad33dafa32d0fc28
  6. Affected versionversion=539dda3c5d190c5088b5e57944b1b482fcb464de <a3034a8d56174dd6464c46823438f25797910a8d
  7. Affected versionversion=539dda3c5d190c5088b5e57944b1b482fcb464de <b690635d4719214892855b79ce018d4b1672ac96
  8. Affected versionversion=539dda3c5d190c5088b5e57944b1b482fcb464de <c18493f750208eb4ff1198fc5a02786b8b2d70a6

What conditions does exploitation require?

Attack vectorlocal
Required privilegesauthenticated

What is affected?

The Linux Kernel Organization · Linux Kernelversion=5.13; version=539dda3c5d190c5088b5e57944b1b482fcb464de <89764cf44544e943230f5e03b8c40a90da26537c; version=539dda3c5d190c5088b5e57944b1b482fcb464de <8a5752c6dcc085a3bfc78589925182e4e98468c5; version=539dda3c5d190c5088b5e57944b1b482fcb464de <8b841fd529db9faf8bc678d429d4bf4e98b10900; version=539dda3c5d190c5088b5e57944b1b482fcb464de <a26dda3bae469c8e4e1b1993ad33dafa32d0fc28; version=539dda3c5d190c5088b5e57944b1b482fcb464de <a3034a8d56174dd6464c46823438f25797910a8d; version=539dda3c5d190c5088b5e57944b1b482fcb464de <b690635d4719214892855b79ce018d4b1672ac96; version=539dda3c5d190c5088b5e57944b1b482fcb464de <c18493f750208eb4ff1198fc5a02786b8b2d70a6

Published CVSS scores

7.8NIST NVDCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS describes severity. EPSS estimates exploitation probability.

Attacks

What attackers are doing with it

Daily unique IPs observed by Shadowserver honeypots for known exploited vulnerabilities (KEVs). Missing observations do not establish an absence of attacks.

Daily unique IPsNo honeypot observations are available for this CVE in the selected window.

No observations available

Sep 10, 2026Sep 16, 2026
Latest reporting daySep 16, 2026
Latest daily unique IPsUnavailable
Prior 30-day averageUnavailable
SourceShadowserver honeypots (KEV)
Vectorlocal
Privilegesauthenticated
Known exploitationUnconfirmed
Public exploitUnconfirmed

Weakness, pattern, technique

CWE-787Out-of-bounds Write
T1068Exploitation for Privilege Escalation

Public exploit references

No public exploit references are available in this record.

Labels summarize the accepted research assessment. They do not indicate a test against your environment.

Technologies

Your stack

See the directory against your own environment.

Your stack

Check the software in your environment

Book a demo to see how Hinoki identifies affected software and validates exploitability in your environment.

Book a demo