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CVE-2026-89586 (GCVE-0-2026-89586)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:44 – Updated: 2026-09-14 12:01
VLAI
Title
ata: libata-scsi: fix DSM TRIM for sector sizes larger than 2048 bytes
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.
Severity
8.2 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff , < 07975b8daa3b0ab3cbc02cc48ea7bc48fadcec53 (git)
Affected: ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff , < b7b5ab2df325ffbbad7ca2debaa071e024d68cb5 (git)
Affected: ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff , < 07baa310ea3224a7044b1ca84796bb37a235af1f (git)
Affected: ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff , < 977554ed91b54075fbc0bac536316b4841ef6258 (git)
Affected: ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff , < 04e2befe25792f2e90097f284d7e86fc6bcfe928 (git)
Affected: ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff , < c2e3dccd6870659851eaa4c12ab16418b8e3040a (git)
Affected: ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff , < 4a4268a0b0a595bd9534cf9c7fda93775a7d8a0d (git)
Affected: ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff , < 79cce911e623c0baa0fde307ce3a434e084b881a (git)
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Linux Linux Affected: 4.9
Unaffected: 0 , < 4.9 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.109 , ≤ 6.12.* (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
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          "programFiles": [
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      ],
      "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."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 8.2,
            "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"
          },
          "scenarios": [
            {
              "lang": "en",
              "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."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-14T12:01:13.899Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "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"
        }
      ],
      "title": "ata: libata-scsi: fix DSM TRIM for sector sizes larger than 2048 bytes",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89586",
    "datePublished": "2026-09-11T19:44:51.322Z",
    "dateReserved": "2026-09-11T19:38:34.729Z",
    "dateUpdated": "2026-09-14T12:01:13.899Z",
    "state": "PUBLISHED"
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    "epss": {
      "cve": "CVE-2026-89586",
      "date": "2026-09-16",
      "epss": "0.00607",
      "percentile": "0.47419"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89586\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-11T20:19:43.040\",\"lastModified\":\"2026-09-14T13:19:12.880\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"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.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/ata/libata-scsi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"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\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/ata/libata-scsi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"4.9\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"4.9\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.270\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.221\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.188\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.157\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.109\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:L/I:N/A:H\",\"baseScore\":8.2,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"LOW\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":4.2}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/04e2befe25792f2e90097f284d7e86fc6bcfe928\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/07975b8daa3b0ab3cbc02cc48ea7bc48fadcec53\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/07baa310ea3224a7044b1ca84796bb37a235af1f\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/4a4268a0b0a595bd9534cf9c7fda93775a7d8a0d\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/79cce911e623c0baa0fde307ce3a434e084b881a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/977554ed91b54075fbc0bac536316b4841ef6258\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/b7b5ab2df325ffbbad7ca2debaa071e024d68cb5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/c2e3dccd6870659851eaa4c12ab16418b8e3040a\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-09-15T10:37:44+00:00",
      "cve": "CVE-2026-89586",
      "id": "CVE-2026-89586",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "248",
      "product_status:known_not_affected": "28",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: ata: libata-scsi: fix DSM TRIM for sector sizes larger than 2048 bytes",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89586.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T00:58:09Z",
      "cve": "CVE-2026-89586",
      "id": "CVE-2026-89586",
      "initial_release_date": "2026-09-12T16:25:35Z",
      "product_status:known_affected": "349",
      "product_status:known_not_affected": "4",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89586",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89586.json",
      "version": "5"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.