Bug 2514447 (CVE-2026-68440)

Summary: CVE-2026-68440 kernel: net: txgbe: fix heap overflow when reading module EEPROM
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security <prodsec-ir-bot>
Status: NEW --- QA Contact:
Severity: medium Docs Contact:
Priority: medium    
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
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Hardware: All   
OS: Linux   
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A flaw was found in the Linux kernel's txgbe network driver. When reading module EEPROM (Electrically Erasable Programmable Read-Only Memory), the txgbe_read_eeprom_hostif() function can attempt to copy more data than the allocated buffer size if the data length is not a multiple of four. This out-of-bounds write can lead to memory corruption, potentially causing system instability or a denial of service.
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oVirt Team: --- RHEL 7.3 requirements from Atomic Host:
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Description OSIDB Bzimport 2026-08-12 00:21:55 UTC 
In the Linux kernel, the following vulnerability has been resolved:

net: txgbe: fix heap overflow when reading module EEPROM

txgbe_read_eeprom_hostif() always copies round_up(length, 4) bytes
into the caller buffer, which ethtool allocates with exactly 'length'
bytes. A non-4-aligned length therefore causes an out-of-bounds write.
Copy only the remaining bytes on the final dword instead.
Comment 1 Mauro Matteo Cascella 2026-08-12 15:24:37 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2026081256-CVE-2026-68440-3dc6@gregkh/T