CVE-2026-98545ata: libata-scsi: bound the ATA passthru sense descriptor writes

Official description

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.

Affected packages & fixed versions

Affected products (as reported)

References

• https://git.kernel.org/stable/c/c698f6deabf680f8f4a1727ef2dc80fe78815fbf
• https://git.kernel.org/stable/c/d9a7147b93624660626cd7c3b1143715699e1f5c
• https://git.kernel.org/stable/c/1603abb0c50420e97cf4a1feddbd5e183c5fdf86
• https://git.kernel.org/stable/c/80fbb0bc4d11683c88f2f9d3997ea02fcada5408
• https://git.kernel.org/stable/c/80320b278fea07ffcda3f57b67b61658e0a4e1ca