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CVE-2025-21738 is an out-of-bounds write vulnerability in the Linux kernel libata-sff ATA/SCSI handling code. A crafted SCSI_IOCTL_SEND_COMMAND request processed through ATA_16 PASS-THROUGH can cause ata_pio_sector() to write beyond its allocated buffer. The reported trigger uses an out_len of 0xd42, the ATA_NOP command, and the ATA_PROT_PIO protocol. The upstream correction adds a bounds check to ata_pio_sector() comparable to the existing protection in __atapi_pio_bytes().
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No public exploit code observed for this vulnerability.
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18 sources tracked across advisories, community write-ups, and news. New activity surfaces here as Mallory finds it.
Out-of-bounds write risk in Linux kernel libata-sff.
A Linux kernel out-of-bounds write vulnerability in the libata-sff ATA PIO handling path. A local authenticated attacker can trigger memory corruption and affect system availability.
A medium-severity Linux kernel out-of-bounds memory-write vulnerability in the libata-sff ATA PIO handling path. A local authenticated attacker with low privileges could cause an availability impact by triggering a write outside an allocated buffer.
An out-of-bounds write vulnerability in the Linux kernel's libata-sff ATA subsystem.
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.