PT-2026-116764 · Linux · Linux
CVE-2026-98545
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Published
2026-10-18
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Updated
2026-10-18
None
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In the Linux kernel, the following vulnerability has been resolved:
ata: libata-scsi: bound the ATA passthru sense descriptor writes
When an ATA PASS-THROUGH command to an ATAPI device fails, the sense
buffer holds the device's REQUEST SENSE reply, and
ata scsi set passthru sense fields() trusts its additional length
byte, sb[7], when adding the ATA Status Return descriptor. A faulty
or malicious device can use that to make the kernel read and write
past the 96-byte buffer in three ways:
- scsi sense desc find() is passed sb[7] + 8 as the buffer length, so its clamp against sb[7] does nothing and the walk runs off the end.
- A type-9 descriptor found near the end is filled in unchecked.
- A new descriptor at sb[8 + len] needs len + 22 bytes, not len + 14, so len 75..82 writes up to 8 bytes past the end.
Reproduced with KASAN under qemu, with the emulated ATAPI REQUEST SENSE
reply patched:
BUG: KASAN: slab-out-of-bounds in scsi sense desc find+0x1a5/0x210
BUG: KASAN: slab-out-of-bounds in ata scsi qc complete+0x1a15/0x1a50
Both are gone with this patch, and a valid descriptor is still filled
in.
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Related Identifiers
Affected Products
Linux