Memory corruption via oversized firmware frame copy
Published Feb 4, 2026 · Updated Feb 4, 2026
Out-of-bounds write in Linux Kernel 6.6 and later allows attackers to corrupt adjacent structure members via oversized firmware frames. The qla27xx_copy_fpin_pkt() and qla27xx_copy_multiple_pkt() paths use firmware-reported frame_size values for memcpy operations into the fixed 64-byte purex_item.iocb member without capping the copy length. Triggering requires a qla2xxx Fibre Channel device to supply a frame larger than 64 bytes; the published record reports a cross-member write and fortify warning but no demonstrated code execution or service interruption.
Summary
What happened
Out-of-bounds write in Linux Kernel 6.6 and later allows attackers to corrupt adjacent structure members via oversized firmware frames. The qla27xx_copy_fpin_pkt() and qla27xx_copy_multiple_pkt() paths use firmware-reported frame_size values for memcpy operations into the fixed 64-byte purex_item.iocb member without capping the copy length. Triggering requires a qla2xxx Fibre Channel device to supply a frame larger than 64 bytes; the published record reports a cross-member write and fortify warning but no demonstrated code execution or service interruption.
The record
- CVE
- CVE-2026-23059
- Published
- Feb 4, 2026
- Updated
- Feb 4, 2026
- Vendor
- The Linux Kernel Organization
- Product
- Linux Kernel
- Classifications
- Unavailable
- Attack vector
- Unavailable
- Privileges
- Unavailable
Timeline
How it unfolded
- Feb 4, 2026CVE publishedPublication date reported by the CVE source.
- Feb 4, 2026Record updatedLatest update available in the CVE record.
Exploitability
Present is not the same as exploitable
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Is a vulnerable build present?
Compare these published version ranges with your installed build and any vendor patches.
- Affected versionversion=6.6
- Affected versionversion=875386b98857822b77ac7f95bdf367b70af5b78c <1922468a4a80424e5a69f7ba50adcee37f4722e9
- Affected versionversion=875386b98857822b77ac7f95bdf367b70af5b78c <19bc5f2a6962dfaa0e32d0e0bc2271993d85d414
- Affected versionversion=875386b98857822b77ac7f95bdf367b70af5b78c <408bfa8d70f79ac696cec1bdbdfb3bf43a02e6d0
- Affected versionversion=875386b98857822b77ac7f95bdf367b70af5b78c <aa14451fa5d5f2de919384c637e2a8c604e1a1fe
What conditions does exploitation require?
What is affected?
Published CVSS scores
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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.
Weakness, pattern, technique
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Public exploit references
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Technologies
Your stack
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Your stack
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