Bug 2439884 (CVE-2026-23180)

Summary: CVE-2026-23180 kernel: Linux kernel (dpaa2-switch): Out-of-bounds read in IRQ handler due to improper if_id validation
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
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Priority: medium    
Version: unspecifiedKeywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's dpaa2-switch component. The Interrupt Request (IRQ) handler improperly validates the 'if_id' value extracted from the hardware status register before using it to access an internal array. This lack of validation allows an attacker to provide an 'if_id' that can lead to an out-of-bounds read. This vulnerability could result in information disclosure, data corruption, or a denial of service.
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Description OSIDB Bzimport 2026-02-14 17:01:23 UTC 
In the Linux kernel, the following vulnerability has been resolved:

dpaa2-switch: add bounds check for if_id in IRQ handler

The IRQ handler extracts if_id from the upper 16 bits of the hardware
status register and uses it to index into ethsw->ports[] without
validation. Since if_id can be any 16-bit value (0-65535) but the ports
array is only allocated with sw_attr.num_ifs elements, this can lead to
an out-of-bounds read potentially.

Add a bounds check before accessing the array, consistent with the
existing validation in dpaa2_switch_rx().
Comment 1 Alexander B 2026-02-16 14:12:10 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026021429-CVE-2026-23180-19a8@gregkh/T