CVE-2026-89586 (GCVE-0-2026-89586)
Vulnerability from cvelistv5
Published
2026-09-11 19:44
Modified
2026-10-19 08:49
Severity ?
8.2 (High) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Summary
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.
References
Impacted products
Vendor Product Version
Linux Linux Version: ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff
Version: ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff
Version: ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff
Version: ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff
Version: ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff
Version: ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff
Version: ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff
Version: ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff
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                "timestamp": "2026-10-16T19:24:31.774727Z",
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nata: libata-scsi: fix DSM TRIM for sector sizes larger than 2048 bytes\n\nata_scsi_write_same_xlat() translates a SCSI WRITE SAME command with the\nUNMAP bit set into an ATA DATA SET MANAGEMENT TRIM command.  The TRIM\ndescriptor is built by ata_format_dsm_trim_descr() into the 2048-byte\nata_scsi_rbuf staging buffer, and the number of bytes copied is compared\nagainst the logical sector size by the caller:\n\n\tsize = ata_format_dsm_trim_descr(scmd, trmax, block, n_block);\n\tif (size != len)\t\t/* len == sdp-\u003esector_size */\n\t\tgoto invalid_param_len;\n\nata_format_dsm_trim_descr() clamps the copy length to ATA_SCSI_RBUF_SIZE\n(2048).  On a device whose logical sector size exceeds that (e.g. a 4Kn\ndevice, where sector_size == 4096) the function can never return more than\n2048, while the caller expects it to return sector_size.  The comparison\ntherefore always fails, so every TRIM is rejected with \"Parameter list\nlength error\" and WARN_ON() splats on each attempt.  TRIM / discard is\nthus completely broken on such devices.\n\nThe descriptor was incorrectly sized from the logical sector size.  A DSM\nTRIM payload is a list of 512-byte pages, each holding up to\nATA_MAX_TRIM_RNUM (64) LBA Range Entries, and is independent of the logical\nsector size.  The Block Limits VPD page already advertises a single such\npage as the maximum WRITE SAME length (65535 * ATA_MAX_TRIM_RNUM logical\nblocks), so the block layer never sends a request that needs more than one\npage.\n\nEmit exactly one 512-byte page, independent of the logical sector size,\nand transfer only that page (COUNT == 1).  For a 512-byte-sector device\nthis is unchanged; devices with larger logical sectors now work instead of\nfailing every TRIM."
        }
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            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H",
            "version": "3.1"
          },
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              "value": "AV:N - SATA/AHCI volumes commonly back NAS/SAN LUNs. Remote iSCSI UNMAP (target_core iblock_execute_unmap()/blkdev_issue_discard()), NFSv4.2 DEALLOCATE (nfsd4_deallocate), and ksmbd FSCTL_SET_ZERO_DATA issue REQ_OP_DISCARD that sd translates to WRITE SAME(16) UNMAP, reaching ata_scsi_write_same_xlat() without local shell access.\nAC:L - On a 4Kn ATA device with TRIM (logical sector_size\u003e2048), every block-layer discard deterministically hits WARN_ON(len\u003eATA_SCSI_RBUF_SIZE) in ata_format_dsm_trim_descr() then fails size!=sector_size. The attacker fully controls UNMAP/discard issuance; no race or uncontrollable memory layout is required.\nPR:N - Unauthenticated iSCSI/NVMe-oF UNMAP and guest NFS/SMB hole-punch need no Linux UID or capability on the target. The same discard path is also reachable locally by an unprivileged writer via fallocate(PUNCH_HOLE) on discard-mounted filesystems, so Privileges Required is None rather than Low or High.\nUI:N - The attacker or ordinary storage clients issue UNMAP, NFSv4.2 DEALLOCATE, hole-punch, BLKDISCARD, or mount-discard/fstrim I/O themselves. No separate victim click, mount, or confirmation is required at exploit time.\nS:U - The WARN_ON splat, kernel log disclosure, and rejected TRIM remain inside the host kernel and the affected ATA device. The defect does not escape a VM, bypass an IOMMU/DMA boundary, or otherwise cross a separate security authority.\nC:L - WARN_ON() (not WARN_ON_ONCE) calls warn_slowpath()/dump_stack() on every TRIM, disclosing kernel text addresses and limited layout in dmesg when kptr_restrict is relaxed. The rbuf length clamp prevents an out-of-bounds read, so this is not an arbitrary memory-disclosure primitive.\nI:N - After the warning, size!=sector_size takes invalid_param_len and returns a SCSI CHECK CONDITION without issuing DSM TRIM or writing kernel objects, user data, or device LBAs. Passthrough WRITE SAME is rejected, so there is no write or code-execution primitive.\nA:H - WARN_ON() taints the kernel and panics when panic_on_warn is set or warn_limit is exceeded. Because it is not WARN_ON_ONCE, a remote initiator can repeat UNMAP to flood logs and force a host panic, and TRIM/discard is completely broken on 4Kn ATA volumes."
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        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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      "title": "ata: libata-scsi: fix DSM TRIM for sector sizes larger than 2048 bytes",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89586",
    "datePublished": "2026-09-11T19:44:51.322Z",
    "dateReserved": "2026-09-11T19:38:34.729Z",
    "dateUpdated": "2026-10-19T08:49:18.983Z",
    "state": "PUBLISHED"
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  "dataType": "CVE_RECORD",
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Remote iSCSI UNMAP (target_core iblock_execute_unmap()/blkdev_issue_discard()), NFSv4.2 DEALLOCATE (nfsd4_deallocate), and ksmbd FSCTL_SET_ZERO_DATA issue REQ_OP_DISCARD that sd translates to WRITE SAME(16) UNMAP, reaching ata_scsi_write_same_xlat() without local shell access.\\nAC:L - On a 4Kn ATA device with TRIM (logical sector_size\u003e2048), every block-layer discard deterministically hits WARN_ON(len\u003eATA_SCSI_RBUF_SIZE) in ata_format_dsm_trim_descr() then fails size!=sector_size. The attacker fully controls UNMAP/discard issuance; no race or uncontrollable memory layout is required.\\nPR:N - Unauthenticated iSCSI/NVMe-oF UNMAP and guest NFS/SMB hole-punch need no Linux UID or capability on the target. The same discard path is also reachable locally by an unprivileged writer via fallocate(PUNCH_HOLE) on discard-mounted filesystems, so Privileges Required is None rather than Low or High.\\nUI:N - The attacker or ordinary storage clients issue UNMAP, NFSv4.2 DEALLOCATE, hole-punch, BLKDISCARD, or mount-discard/fstrim I/O themselves. No separate victim click, mount, or confirmation is required at exploit time.\\nS:U - The WARN_ON splat, kernel log disclosure, and rejected TRIM remain inside the host kernel and the affected ATA device. The defect does not escape a VM, bypass an IOMMU/DMA boundary, or otherwise cross a separate security authority.\\nC:L - WARN_ON() (not WARN_ON_ONCE) calls warn_slowpath()/dump_stack() on every TRIM, disclosing kernel text addresses and limited layout in dmesg when kptr_restrict is relaxed. The rbuf length clamp prevents an out-of-bounds read, so this is not an arbitrary memory-disclosure primitive.\\nI:N - After the warning, size!=sector_size takes invalid_param_len and returns a SCSI CHECK CONDITION without issuing DSM TRIM or writing kernel objects, user data, or device LBAs. Passthrough WRITE SAME is rejected, so there is no write or code-execution primitive.\\nA:H - WARN_ON() taints the kernel and panics when panic_on_warn is set or warn_limit is exceeded. Because it is not WARN_ON_ONCE, a remote initiator can repeat UNMAP to flood logs and force a host panic, and TRIM/discard is completely broken on 4Kn ATA volumes.\"}]}], \"affected\": [{\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff\", \"lessThan\": \"07975b8daa3b0ab3cbc02cc48ea7bc48fadcec53\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff\", \"lessThan\": \"b7b5ab2df325ffbbad7ca2debaa071e024d68cb5\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff\", \"lessThan\": \"07baa310ea3224a7044b1ca84796bb37a235af1f\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff\", \"lessThan\": \"977554ed91b54075fbc0bac536316b4841ef6258\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff\", \"lessThan\": \"04e2befe25792f2e90097f284d7e86fc6bcfe928\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff\", \"lessThan\": \"c2e3dccd6870659851eaa4c12ab16418b8e3040a\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff\", \"lessThan\": \"4a4268a0b0a595bd9534cf9c7fda93775a7d8a0d\", \"versionType\": \"git\"}, {\"status\": \"affected\", \"version\": \"ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff\", \"lessThan\": \"79cce911e623c0baa0fde307ce3a434e084b881a\", \"versionType\": \"git\"}], \"programFiles\": [\"drivers/ata/libata-scsi.c\"], \"defaultStatus\": \"unaffected\"}, {\"repo\": \"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\", \"vendor\": \"Linux\", \"product\": \"Linux\", \"versions\": [{\"status\": \"affected\", \"version\": \"4.9\"}, {\"status\": \"unaffected\", \"version\": \"0\", \"lessThan\": \"4.9\", \"versionType\": \"semver\"}, {\"status\": \"unaffected\", \"version\": \"5.10.270\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.10.*\"}, {\"status\": \"unaffected\", \"version\": \"5.15.221\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"5.15.*\"}, {\"status\": \"unaffected\", \"version\": \"6.1.188\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.1.*\"}, {\"status\": \"unaffected\", \"version\": \"6.6.157\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.6.*\"}, {\"status\": \"unaffected\", \"version\": \"6.12.109\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.12.*\"}, {\"status\": \"unaffected\", \"version\": \"6.18.50\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"6.18.*\"}, {\"status\": \"unaffected\", \"version\": \"7.2.4\", \"versionType\": \"semver\", \"lessThanOrEqual\": \"7.2.*\"}, {\"status\": \"unaffected\", \"version\": \"7.3\", \"versionType\": \"original_commit_for_fix\", \"lessThanOrEqual\": \"*\"}], \"programFiles\": [\"drivers/ata/libata-scsi.c\"], \"defaultStatus\": \"affected\"}], \"references\": [{\"url\": \"https://git.kernel.org/stable/c/07975b8daa3b0ab3cbc02cc48ea7bc48fadcec53\"}, {\"url\": \"https://git.kernel.org/stable/c/b7b5ab2df325ffbbad7ca2debaa071e024d68cb5\"}, {\"url\": \"https://git.kernel.org/stable/c/07baa310ea3224a7044b1ca84796bb37a235af1f\"}, {\"url\": \"https://git.kernel.org/stable/c/977554ed91b54075fbc0bac536316b4841ef6258\"}, {\"url\": \"https://git.kernel.org/stable/c/04e2befe25792f2e90097f284d7e86fc6bcfe928\"}, {\"url\": \"https://git.kernel.org/stable/c/c2e3dccd6870659851eaa4c12ab16418b8e3040a\"}, {\"url\": \"https://git.kernel.org/stable/c/4a4268a0b0a595bd9534cf9c7fda93775a7d8a0d\"}, {\"url\": \"https://git.kernel.org/stable/c/79cce911e623c0baa0fde307ce3a434e084b881a\"}], \"x_generator\": {\"engine\": \"bippy-1.2.0\"}, \"descriptions\": [{\"lang\": \"en\", \"value\": \"In the Linux kernel, the following vulnerability has been resolved:\\n\\nata: libata-scsi: fix DSM TRIM for sector sizes larger than 2048 bytes\\n\\nata_scsi_write_same_xlat() translates a SCSI WRITE SAME command with the\\nUNMAP bit set into an ATA DATA SET MANAGEMENT TRIM command.  The TRIM\\ndescriptor is built by ata_format_dsm_trim_descr() into the 2048-byte\\nata_scsi_rbuf staging buffer, and the number of bytes copied is compared\\nagainst the logical sector size by the caller:\\n\\n\\tsize = ata_format_dsm_trim_descr(scmd, trmax, block, n_block);\\n\\tif (size != len)\\t\\t/* len == sdp-\u003esector_size */\\n\\t\\tgoto invalid_param_len;\\n\\nata_format_dsm_trim_descr() clamps the copy length to ATA_SCSI_RBUF_SIZE\\n(2048).  On a device whose logical sector size exceeds that (e.g. a 4Kn\\ndevice, where sector_size == 4096) the function can never return more than\\n2048, while the caller expects it to return sector_size.  The comparison\\ntherefore always fails, so every TRIM is rejected with \\\"Parameter list\\nlength error\\\" and WARN_ON() splats on each attempt.  TRIM / discard is\\nthus completely broken on such devices.\\n\\nThe descriptor was incorrectly sized from the logical sector size.  A DSM\\nTRIM payload is a list of 512-byte pages, each holding up to\\nATA_MAX_TRIM_RNUM (64) LBA Range Entries, and is independent of the logical\\nsector size.  The Block Limits VPD page already advertises a single such\\npage as the maximum WRITE SAME length (65535 * ATA_MAX_TRIM_RNUM logical\\nblocks), so the block layer never sends a request that needs more than one\\npage.\\n\\nEmit exactly one 512-byte page, independent of the logical sector size,\\nand transfer only that page (COUNT == 1).  For a 512-byte-sector device\\nthis is unchanged; devices with larger logical sectors now work instead of\\nfailing every TRIM.\"}], \"cpeApplicability\": [{\"nodes\": [{\"negate\": false, \"cpeMatch\": [{\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.10.270\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"5.15.221\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.1.188\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.6.157\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.12.109\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"6.18.50\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.2.4\", \"versionStartIncluding\": \"4.9\"}, {\"criteria\": \"cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*\", \"vulnerable\": true, \"versionEndExcluding\": \"7.3\", \"versionStartIncluding\": \"4.9\"}], \"operator\": \"OR\"}]}], \"providerMetadata\": {\"orgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"shortName\": \"Linux\", \"dateUpdated\": \"2026-10-19T08:49:18.983Z\"}}}",
      "cveMetadata": "{\"cveId\": \"CVE-2026-89586\", \"state\": \"PUBLISHED\", \"dateUpdated\": \"2026-10-19T08:49:18.983Z\", \"dateReserved\": \"2026-09-11T19:38:34.729Z\", \"assignerOrgId\": \"416baaa9-dc9f-4396-8d5f-8c081fb06d67\", \"datePublished\": \"2026-09-11T19:44:51.322Z\", \"assignerShortName\": \"Linux\"}",
      "dataType": "CVE_RECORD",
      "dataVersion": "5.2"
    }
  }
}


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