{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89586", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.729Z", "datePublished": "2026-09-11T19:44:51.322Z", "dateUpdated": "2026-10-19T08:49:18.983Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:49:18.983Z" }, "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->sector_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": { "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" }, "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>2048), every block-layer discard deterministically hits WARN_ON(len>ATA_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": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/ata/libata-scsi.c" ], "versions": [ { "version": "ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff", "lessThan": "07975b8daa3b0ab3cbc02cc48ea7bc48fadcec53", "status": "affected", "versionType": "git" }, { "version": "ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff", "lessThan": "b7b5ab2df325ffbbad7ca2debaa071e024d68cb5", "status": "affected", "versionType": "git" }, { "version": "ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff", "lessThan": "07baa310ea3224a7044b1ca84796bb37a235af1f", "status": "affected", "versionType": "git" }, { "version": "ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff", "lessThan": "977554ed91b54075fbc0bac536316b4841ef6258", "status": "affected", "versionType": "git" }, { "version": "ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff", "lessThan": "04e2befe25792f2e90097f284d7e86fc6bcfe928", "status": "affected", "versionType": "git" }, { "version": "ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff", "lessThan": "c2e3dccd6870659851eaa4c12ab16418b8e3040a", "status": "affected", "versionType": "git" }, { "version": "ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff", "lessThan": "4a4268a0b0a595bd9534cf9c7fda93775a7d8a0d", "status": "affected", "versionType": "git" }, { "version": "ef2d7392c4ece5c3cd12a6c7ca9366cd8f189aff", "lessThan": "79cce911e623c0baa0fde307ce3a434e084b881a", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/ata/libata-scsi.c" ], "versions": [ { "version": "4.9", "status": "affected" }, { "version": "0", "lessThan": "4.9", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.109", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.12.109" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9", "versionEndExcluding": "7.3" } ] } ] } ], "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" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-89586", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "yes" }, { "Technical Impact": "partial" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:24:31.774727Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:45.052Z" } } ] } }