CVE-2025-21738

Summary

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.

Impact & exploitability

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected products we track (1)

Recommendation

Apply the vendor fix promptly. Open any affected product above for its exact safe version.

Official patch: https://git.kernel.org/stable/c/0a17a9944b8d89ef03946121241870ac53ddaf45 ↗

Additional information

• NVD record
• https://git.kernel.org/stable/c/0a17a9944b8d89ef03946121241870ac53ddaf45Patch
• https://git.kernel.org/stable/c/0dd5aade301a10f4b329fa7454fdcc2518741902Patch
• https://git.kernel.org/stable/c/6e74e53b34b6dec5a50e1404e2680852ec6768d2Patch
• https://git.kernel.org/stable/c/a8f8cf87059ed1905c2a5c72f8b39a4f57b11b4cPatch
• https://git.kernel.org/stable/c/d5e6e3000309359eae2a17117aa6e3c44897bf6cPatch
• https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html