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CVE-2025-21738 is an out-of-bounds write vulnerability in the Linux kernel libata-sff ATA/SCSI PIO handling path. A crafted SCSI_IOCTL_SEND_COMMAND request using ATA_16 PASS-THROUGH, ATA_PROT_PIO, and an ATA_NOP command can cause ata_pio_sector() to transfer data beyond the allocated buffer. The flaw was observed with an output length of 0xd42, causing kernel memory outside the intended buffer to be overwritten. The upstream fix adds bounds validation to ata_pio_sector(), analogous to the existing protection in __atapi_pio_bytes().
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What an attacker gets, and what they’ve been doing with it.
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No public exploit code observed for this vulnerability.
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Vendor-confirmed product mapping. Mallory continuously reconciles this list against your asset inventory.
12 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Linux kernel libata buffer-overflow vulnerability.
Linux kernel libata-sff out-of-bounds write vulnerability.
An out-of-bounds memory-write vulnerability in the Linux kernel libata-sff ATA PIO path. A specially formed SCSI ATA pass-through ioctl can cause ata_pio_sector() to write beyond its allocated buffer.
Query your assets running an affected version, and investigate the blast radius.
Every observed campaign linking this CVE to a named adversary.
Malware families riding this exploit, with evidence and IOCs.
YARA, Sigma, Snort, and vendor rules, auto-deployed to your SIEM.
Cross-references every affected SKU, including bundled OEM variants.
Community discussion across Reddit, Mastodon, and other social sources.