High 7.8Published Feb 26, 2025

CVE-2025-21738ata: libata-sff: Ensure that we cannot write outside the allocated buffer

Updated under an hour ago (Oct 27, 2026, 2:10 PM ET)

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No exploitation reported and no EPSS estimate yet.

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Exploited in the last 30 days

In the Linux kernel, the following vulnerability has been resolved: ata: libata-sff: Ensure that we cannot write outside the allocated buffer reveliofuzzing reported that a SCSI_IOCTL_SEND_COMMAND ioctl with out_len set to 0xd42, SCSI command set to ATA_16 PASS-THROUGH, ATA command set to ATA_NOP, and protocol set to ATA_PROT_PIO, can cause ata_pio_sector() to write outside the allocated buffer, overwriting random memory. While a ATA device is supposed to abort a ATA_NOP command, there does seem to be a bug either in libata-sff or QEMU, where either this status is not set, or the status is cleared before read by ata_sff_hsm_move(). Anyway, that is most likely a separate bug. Looking at __atapi_pio_bytes(), it already has a safety check to ensure that __atapi_pio_bytes() cannot write outside the allocated buffer. Add a similar check to ata_pio_sector(), such that also ata_pio_sector() cannot write outside the allocated buffer.

CVSS: 7.8 HIGH (v3.1, CNA)CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Weakness (CWE): Not given
Known exploited: Not in CISA's KEV catalog
EPSS (exploitation in the next 30 days): Not loaded for this CVE
Assigned by: Linux
NVD analysis: Modified
Record last updated: Oct 14, 2026
First seen by InfoSec Signals: Oct 14, 2026

Affected products

Affected products

Linux Linux linux:linux (from the name)	from 5a5dbd18a7496ed403f6f54bb20c955c65482fa5 before a8f8cf87059ed1905c2a5c72f8b39a4f57b11b4c; from 5a5dbd18a7496ed403f6f54bb20c955c65482fa5 before d5e6e3000309359eae2a17117aa6e3c44897bf6c; 5a5dbd18a7496ed403f6f54bb20c955c65482fa5 builds before 0dd5aade301a10f4b329fa7454fdcc2518741902; 5a5dbd18a7496ed403f6f54bb20c955c65482fa5 builds before 0a17a9944b8d89ef03946121241870ac53ddaf45; from 5a5dbd18a7496ed403f6f54bb20c955c65482fa5 before 6e74e53b34b6dec5a50e1404e2680852ec6768d2	CNA record
Siemens SIMATIC S7-1500 TM MFP - GNU/Linux subsystem siemens:simatic_s7_1500_tm_mfp_gnu_linux_subsystem (from the name)	all versions	CISA ADP
linux linux_kernel linux:linux_kernel	before 6.1.129; from 6.2 before 6.6.78; from 6.7 before 6.12.14; from 6.13 before 6.13.3	NVD

References

References

https://git.kernel.org/stable/c/a8f8cf87059ed1905c2a5c72f8b39a4f57b11b4c	patch
https://git.kernel.org/stable/c/d5e6e3000309359eae2a17117aa6e3c44897bf6c	patch
https://git.kernel.org/stable/c/0dd5aade301a10f4b329fa7454fdcc2518741902	patch
https://git.kernel.org/stable/c/0a17a9944b8d89ef03946121241870ac53ddaf45	patch
https://git.kernel.org/stable/c/6e74e53b34b6dec5a50e1404e2680852ec6768d2	patch
https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html
https://cert-portal.siemens.com/productcert/html/ssa-784472.html

The CVE record on cve.org NVD's entry

The CVE record is authoritative. Products marked “from the name” were identified from the CNA's free-text names, not a CPE, and are matched less certainly. This product uses the NVD API but is not endorsed or certified by the NVD.