CVE-2026-89586High· 8.2▾ TwilightIn 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 A…
▾ Twilight zone — High severity, or a signal on a lesser flaw
impact 45.1 · likelihood 0.1 · exploitation 0
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Stakeholder-Specific Vulnerability Categorization from CISA's ADP record at CVE.org: whether exploitation is observed, whether an attack can be automated, and how much of the system is at stake. The CVSS score shown above comes from the assigning CNA record, not NVD.
Exploit-prediction probability, daily snapshots since Sep 12.
Disclosure to exploitation, from the record and what we observed since indexing it.
Disclosed via CVEORG
0.2%
8.2 → 4.4
high → medium
4.4 → 8.2
medium → high
8.2 → 5.5
high → medium
0.2% → 0.6%
5.5 → 8.2
medium → high
8.2 → 5.5
high → medium
Last analysed / modified upstream
5.5 → 8.2
medium → high
In 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.
Linux >= ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff < 07975b8daa3b0ab3cbc02cc48ea7bc48fadcec53Linux >= ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff < b7b5ab2df325ffbbad7ca2debaa071e024d68cb5Linux >= ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff < 07baa310ea3224a7044b1ca84796bb37a235af1fLinux >= ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff < 977554ed91b54075fbc0bac536316b4841ef6258Linux >= ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff < 04e2befe25792f2e90097f284d7e86fc6bcfe928Linux >= ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff < c2e3dccd6870659851eaa4c12ab16418b8e3040aLinux >= ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff < 4a4268a0b0a595bd9534cf9c7fda93775a7d8a0dLinux >= ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff < 79cce911e623c0baa0fde307ce3a434e084b881aLinux 4.9Refer to the linked advisories for vendor-supplied fixes and affected version ranges.
Field changes observed since this record was first indexed.
Connected by shared product, vendor, weakness, or advisory.
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