Answer in brief
CVE-2025-21738 records a High severity (CVSS 7.8) vulnerability in ata: libata-sff: Ensure that we cannot write outside the allocated buffer. The current sources do not mark it as known exploited. The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
Analysis pending evidence review
HOL Guard separates source facts from reviewed analysis. See the methodology.
CVSS is 7.8. The current sources do not mark it as known exploited. Treat this as a source-backed prioritization signal, not a statement about your environment.
Analysis status
Analysis pending evidence review
Factual feed record only; HOL analysis is not approved for indexing. Read the methodology.
The current feed maps Linux/Linux (generic), Linux/Linux (generic), Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystem (generic). Check affected ranges and fixed versions before updating.
| Product | Affected versions | Fixed versions |
|---|---|---|
| cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* | Not reported | Not reported |
| Package | Affected range | Fixed version |
|---|---|---|
| Linux/Linuxgeneric | >=5a5dbd18a7496ed403f6f54bb20c955c65482fa5 <a8f8cf87059ed1905c2a5c72f8b39a4f57b11b4c || >=5a5dbd18a7496ed403f6f54bb20c955c65482fa5 <d5e6e3000309359eae2a17117aa6e3c44897bf6c || >=5a5dbd18a7496ed403f6f54bb20c955c65482fa5 <0dd5aade301a10f4b329fa7454fdcc2518741902 || >=5a5dbd18a7496ed403f6f54bb20c955c65482fa5 <0a17a9944b8d89ef03946121241870ac53ddaf45 || >=5a5dbd18a7496ed403f6f54bb20c955c65482fa5 <6e74e53b34b6dec5a50e1404e2680852ec6768d2 | a8f8cf87059ed1905c2a5c72f8b39a4f57b11b4c, d5e6e3000309359eae2a17117aa6e3c44897bf6c, 0dd5aade301a10f4b329fa7454fdcc2518741902, 0a17a9944b8d89ef03946121241870ac53ddaf45, 6e74e53b34b6dec5a50e1404e2680852ec6768d2 |
| Linux/Linuxgeneric | 2.6.22 | Not reported |
| Siemens/SIMATIC S7-1500 TM MFP - GNU/Linux subsystemgeneric | >=0 <* | * |
Published upstream
Feb 27, 2025
Evidence: source:cvelist:source_dates:source-dates:recordSource modified
Oct 15, 2026
Evidence: source:cvelist:source_dates:source-dates:recordFirst seen by HOL
Aug 5, 2026
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.
Quoted source text, attributed separately from HOL analysis.