ata: libata-scsi: fix DSM TRIM for sector sizes larger than 2048 bytes

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-89586
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-11 20:19:43 UTC
Updated2026-09-11 20:19:43 UTC
DescriptionIn the Linux kernel, the following vulnerability has been resolved: ata: libata-scsi: fix DSM TRIM for sector sizes larger than 2048 bytes ata_scsi_write_same_xlat() translates a SCSI WRITE SAME command with the UNMAP bit set into an ATA DATA SET MANAGEMENT TRIM command. The TRIM descriptor is built by ata_format_dsm_trim_descr() into the 2048-byte ata_scsi_rbuf staging buffer, and the number of bytes copied is compared against the logical sector size by the caller: size = ata_format_dsm_trim_descr(scmd, trmax, block, n_block); if (size != len) /* len == sdp->sector_size */ goto invalid_param_len; ata_format_dsm_trim_descr() clamps the copy length to ATA_SCSI_RBUF_SIZE (2048). On a device whose logical sector size exceeds that (e.g. a 4Kn device, where sector_size == 4096) the function can never return more than 2048, while the caller expects it to return sector_size. The comparison therefore always fails, so every TRIM is rejected with "Parameter list length error" and WARN_ON() splats on each attempt. TRIM / discard is thus completely broken on such devices. The descriptor was incorrectly sized from the logical sector size. A DSM TRIM payload is a list of 512-byte pages, each holding up to ATA_MAX_TRIM_RNUM (64) LBA Range Entries, and is independent of the logical sector size. The Block Limits VPD page already advertises a single such page as the maximum WRITE SAME length (65535 * ATA_MAX_TRIM_RNUM logical blocks), so the block layer never sends a request that needs more than one page. Emit exactly one 512-byte page, independent of the logical sector size, and transfer only that page (COUNT == 1). For a 512-byte-sector device this is unchanged; devices with larger logical sectors now work instead of failing every TRIM.

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff 04e2befe25792f2e90097f284d7e86fc6bcfe928 git Not specified
CNA Linux Linux affected ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff c2e3dccd6870659851eaa4c12ab16418b8e3040a git Not specified
CNA Linux Linux affected ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff 4a4268a0b0a595bd9534cf9c7fda93775a7d8a0d git Not specified
CNA Linux Linux affected ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff 79cce911e623c0baa0fde307ce3a434e084b881a git Not specified
CNA Linux Linux affected 4.9 Not specified
CNA Linux Linux unaffected 4.9 semver Not specified
CNA Linux Linux unaffected 6.12.109 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.50 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.4 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/c2e3dccd6870659851eaa4c12ab16418b8e3040a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/4a4268a0b0a595bd9534cf9c7fda93775a7d8a0d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/79cce911e623c0baa0fde307ce3a434e084b881a 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/04e2befe25792f2e90097f284d7e86fc6bcfe928 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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