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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinux5a5dbd18a7496ed403f6f54bb20c955c65482fa5 < a8f8cf87059ed1905c2a5c72f8b39a4f57b11b4caffected
LinuxLinux5a5dbd18a7496ed403f6f54bb20c955c65482fa5 < d5e6e3000309359eae2a17117aa6e3c44897bf6caffected
LinuxLinux5a5dbd18a7496ed403f6f54bb20c955c65482fa5 < 0dd5aade301a10f4b329fa7454fdcc2518741902affected
LinuxLinux5a5dbd18a7496ed403f6f54bb20c955c65482fa5 < 0a17a9944b8d89ef03946121241870ac53ddaf45affected
LinuxLinux5a5dbd18a7496ed403f6f54bb20c955c65482fa5 < 6e74e53b34b6dec5a50e1404e2680852ec6768d2affected
LinuxLinux2.6.22affected
LinuxLinux0 < 2.6.22unaffected
LinuxLinux6.1.129 <= 6.1.*unaffected
LinuxLinux6.6.78 <= 6.6.*unaffected
LinuxLinux6.12.14 <= 6.12.*unaffected
LinuxLinux6.13.3 <= 6.13.*unaffected
LinuxLinux6.14 <= *unaffected

Weaknesses

ADP Enrichment

CVE Program Container

Additional References

References