GHSA-F4R5-W3WM-C5G6
Vulnerability from github – Published: 2025-02-27 03:34 – Updated: 2025-11-03 21:32In 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": [],
"aliases": [
"CVE-2025-21738"
],
"database_specific": {
"cwe_ids": [],
"github_reviewed": false,
"github_reviewed_at": null,
"nvd_published_at": "2025-02-27T03:15:14Z",
"severity": "MODERATE"
},
"details": "In the Linux kernel, the following vulnerability has been resolved:\n\nata: libata-sff: Ensure that we cannot write outside the allocated buffer\n\nreveliofuzzing reported that a SCSI_IOCTL_SEND_COMMAND ioctl with out_len\nset to 0xd42, SCSI command set to ATA_16 PASS-THROUGH, ATA command set to\nATA_NOP, and protocol set to ATA_PROT_PIO, can cause ata_pio_sector() to\nwrite outside the allocated buffer, overwriting random memory.\n\nWhile a ATA device is supposed to abort a ATA_NOP command, there does seem\nto be a bug either in libata-sff or QEMU, where either this status is not\nset, or the status is cleared before read by ata_sff_hsm_move().\nAnyway, that is most likely a separate bug.\n\nLooking at __atapi_pio_bytes(), it already has a safety check to ensure\nthat __atapi_pio_bytes() cannot write outside the allocated buffer.\n\nAdd a similar check to ata_pio_sector(), such that also ata_pio_sector()\ncannot write outside the allocated buffer.",
"id": "GHSA-f4r5-w3wm-c5g6",
"modified": "2025-11-03T21:32:59Z",
"published": "2025-02-27T03:34:04Z",
"references": [
{
"type": "ADVISORY",
"url": "https://nvd.nist.gov/vuln/detail/CVE-2025-21738"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0a17a9944b8d89ef03946121241870ac53ddaf45"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/0dd5aade301a10f4b329fa7454fdcc2518741902"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/6e74e53b34b6dec5a50e1404e2680852ec6768d2"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/a8f8cf87059ed1905c2a5c72f8b39a4f57b11b4c"
},
{
"type": "WEB",
"url": "https://git.kernel.org/stable/c/d5e6e3000309359eae2a17117aa6e3c44897bf6c"
},
{
"type": "WEB",
"url": "https://lists.debian.org/debian-lts-announce/2025/03/msg00028.html"
}
],
"schema_version": "1.4.0",
"severity": [
{
"score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H",
"type": "CVSS_V3"
}
]
}
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