VulnerabilityPublished 14 Feb 2026Updated 5 Nov 2026

CVE-2026-23206: Linux kernel · dpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in ed48a84a72fefb20a82dd90a7caa7807e90c6f66 : update Linux kernel when convenient.

Data as of 5 Nov 2026, 21:49 UTC

Severity

Unrated

Rated by Threat Radar · No CVSS score from NVD or the CNA

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-05.

Patch

Available – fixed in ed48a84a72fefb20a82dd90a7caa7807e90c6f66, b97415c4362f739e25ec6f71012277086fabdf6f, 80165ff16051448d6f840585ebe13f2400415df3 +3

Exploitation evidence

Disclosed: evidence found.
CVE published 14 Feb 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 5 Nov 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 0b1b71370458860579831e77485883fcf2e8fbbe, < ed48a84a72fefb20a82dd90a7caa7807e90c6f66	Fixed in ed48a84a72fefb20a82dd90a7caa7807e90c6f66
LinuxLinux	Affected ≥ 0b1b71370458860579831e77485883fcf2e8fbbe, < b97415c4362f739e25ec6f71012277086fabdf6f	Fixed in b97415c4362f739e25ec6f71012277086fabdf6f
LinuxLinux	Affected ≥ 0b1b71370458860579831e77485883fcf2e8fbbe, < 80165ff16051448d6f840585ebe13f2400415df3	Fixed in 80165ff16051448d6f840585ebe13f2400415df3
LinuxLinux	Affected ≥ 0b1b71370458860579831e77485883fcf2e8fbbe, < 155eb99aff2920153bf21217ae29565fff81e6af	Fixed in 155eb99aff2920153bf21217ae29565fff81e6af
LinuxLinux	Affected ≥ 0b1b71370458860579831e77485883fcf2e8fbbe, < 4acc40db06ffd0fd92683505342b00c8a7394c60	Fixed in 4acc40db06ffd0fd92683505342b00c8a7394c60
LinuxLinux	Affected ≥ 0b1b71370458860579831e77485883fcf2e8fbbe, < 2fcccca88456b592bd668db13aa1d29ed257ca2b	Fixed in 2fcccca88456b592bd668db13aa1d29ed257ca2b

Description

In the Linux kernel, the following vulnerability has been resolved: dpaa2-switch: prevent ZERO_SIZE_PTR dereference when num_ifs is zero The driver allocates arrays for ports, FDBs, and filter blocks using kcalloc() with ethsw->sw_attr.num_ifs as the element count. When the device reports zero interfaces (either due to hardware configuration or firmware issues), kcalloc(0, ...) returns ZERO_SIZE_PTR (0x10) instead of NULL. Later in dpaa2_switch_probe(), the NAPI initialization unconditionally accesses ethsw->ports[0]->netdev, which attempts to dereference ZERO_SIZE_PTR (address 0x10), resulting in a kernel panic. Add a check to ensure num_ifs is greater than zero after retrieving device attributes. This prevents the zero-sized allocations and subsequent invalid pointer dereference.

References

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