Bug 2546538 (CVE-2026-98275)

Summary: CVE-2026-98275 kernel: kernel: Denial of Service via improper interrupt acknowledgment in Cortina Ethernet driver
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
Status: NEW --- QA Contact:
Severity: high Docs Contact:
Priority: high    
Version: unspecifiedCC: akhatavk, aos-team-art-private, asdas, dpaolell, jdelft, jupierce, lgarciaa, mbiarnes, ppalepu, ppostler, prdhamdh, rhel-process-autobot, sghai, sidsharm, suppawar, vlaad, watson-tool-maintainers
Target Milestone: ---Keywords: Security
Target Release: ---   
Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's Cortina Ethernet driver. This flaw may result in a Denial of Service (DoS) when a network receive buffer overrun occurs. Due to an incorrect bit calculation, the interrupt service routine acknowledges the wrong register bit, leaving the overrun interrupt uncleared. An attacker capable of sending high volumes of network traffic could trigger this flaw, potentially causing an interrupt storm that leads to system degradation or unresponsiveness.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-10-06 09:40:53 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: ethernet: cortina: Ack RX overrun interrupt correctly

The RX overrun interrupt is reported in interrupt status register 4, but
gmac_irq() acknowledges it using the RX descriptor error bit from status
register 0. For GMAC0 this writes the GMAC1 overrun bit, while for GMAC1
the shift leaves no bit in the 32-bit register.

Acknowledge the same per-port RX overrun bit that was detected.