{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-98479", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-25T10:25:14.351Z", "datePublished": "2026-10-18T15:15:53.663Z", "dateUpdated": "2026-10-24T14:09:01.805Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-24T14:09:01.805Z" }, "descriptions": [ { "lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: libiscsi_tcp: Check the data direction of a Data-In PDU\n\nThe Data-In branch of iscsi_tcp_hdr_dissect() resolves the ITT to a task\nand copies the PDU's data segment into that command's scatterlist without\nasking whether the command was reading. iscsi_tcp_r2t_rsp() in the same\nfile does ask, and rejects an R2T for a command that is not DMA_TO_DEVICE.\n\nA target that answers a WRITE command's ITT with a Data-In therefore has\nthe initiator write target-supplied bytes into the pages that write was\nabout to send. Those are the caller's own pinned pages for an O_DIRECT\nwrite, and page cache pages for a buffered one.\n\nObserved against a test target that emits one 512-byte Data-In naming a 128\nKB write's ITT, after the R2T for that write. With O_DIRECT the caller's\nbuffer ends up holding 512 bytes of the target's data while pwrite()\nreturns 131072. Buffered is quieter: pwrite() and fsync() both succeed,\nnothing is logged, and reading those blocks back returns the target's bytes\nout of the page cache without a command going on the wire.\n\nCheck the direction before using the scatterlist, the way the R2T path\nalready does." } ], "metrics": [ { "cvssV3_1": { "version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:H/A:N", "baseScore": 7.5, "baseSeverity": "HIGH" }, "scenarios": [ { "lang": "en", "value": "AV:N - A remote iSCSI target supplies the malicious SCSI Data-In PDU over routable TCP; iscsi_sw_tcp_data_ready() reaches iscsi_tcp_recv_skb(), iscsi_tcp_hdr_dissect(), and the patched iscsi_tcp_data_in().\nAC:L - iscsi_prep_scsi_cmd_pdu() exposes the live WRITE ITT to the target, which can deterministically return a Data-In with that ITT, the expected DataSN, and an in-range offset and length; no race or outside condition is required.\nPR:N - The receive path imposes no privilege or per-PDU authentication check on the connected target; iscsi_verify_itt() only validates the ITT's session age and index, and the target learns that ITT from the WRITE command.\nUI:N - After iscsi_queuecommand() submits an ordinary WRITE on a logged-in session, the target's Data-In is processed automatically by the TCP callback; exploitation requires no user approval or opening of attacker-supplied content.\nS:U - iscsi_tcp_hdr_dissect() redirects data into task->sc->sdb, affecting the initiator's caller pages or page cache under the same host-kernel security authority, without crossing a VM, IOMMU, or sandbox boundary.\nC:N - iscsi_tcp_segment_recv() only copies target-supplied bytes into the command scatterlist; this defect provides no path for reading initiator memory or returning unintended bytes to the target.\nI:H - iscsi_segment_seek_sg() makes the receive segment reference a WRITE command's sdb, after which iscsi_tcp_segment_recv() copies attacker-chosen bytes into an O_DIRECT caller buffer or buffered-write page-cache pages.\nA:N - iscsi_tcp_data_in() bounds the offset and DataSegmentLength to sdb.length, and iscsi_segment_seek_sg() rejects offsets outside the scatterlist; the demonstrated effect is silent bounded data corruption, not an oops, hang, or resource exhaustion." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/scsi/libiscsi_tcp.c" ], "versions": [ { "version": "a081c13e39b5c17052a7b46fafa61019c4c110ff", "lessThan": "79991b770fc3685b1d5cf805b659a879edd19931", "status": "affected", "versionType": "git" }, { "version": "a081c13e39b5c17052a7b46fafa61019c4c110ff", "lessThan": "8db1232945bc663fb94f300090a1fc108de99296", "status": "affected", "versionType": "git" }, { "version": "a081c13e39b5c17052a7b46fafa61019c4c110ff", "lessThan": "94e5bdd08e51c450d954bc592f591c233ca5c9df", "status": "affected", "versionType": "git" }, { "version": "a081c13e39b5c17052a7b46fafa61019c4c110ff", "lessThan": "de96dc11aee0d058927bff94a168e3c5c46483e2", "status": "affected", "versionType": "git" }, { "version": "a081c13e39b5c17052a7b46fafa61019c4c110ff", "lessThan": "e3b25bf2cf2496e85bc05b33360faf9fdf880e03", "status": "affected", "versionType": "git" }, { "version": "a081c13e39b5c17052a7b46fafa61019c4c110ff", "lessThan": "ee56b5e18f566c0b5a183379dcd63d402cebf2f8", "status": "affected", "versionType": "git" }, { "version": "a081c13e39b5c17052a7b46fafa61019c4c110ff", "lessThan": "24ffc919467d20951f0f132d1c75294e2e91e09b", "status": "affected", "versionType": "git" }, { "version": "a081c13e39b5c17052a7b46fafa61019c4c110ff", "lessThan": "bce07e2f37b5e4a427d36fd6b1c14067b27591db", "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/scsi/libiscsi_tcp.c" ], "versions": [ { "version": "2.6.29", "status": "affected" }, { "version": "0", "lessThan": "2.6.29", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.271", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.222", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.189", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.158", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.55", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.9", "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": "2.6.29", "versionEndExcluding": "5.10.271" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "5.15.222" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.1.189" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.6.158" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.12.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "6.18.55" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "7.2.9" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.29", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/79991b770fc3685b1d5cf805b659a879edd19931" }, { "url": "https://git.kernel.org/stable/c/8db1232945bc663fb94f300090a1fc108de99296" }, { "url": "https://git.kernel.org/stable/c/94e5bdd08e51c450d954bc592f591c233ca5c9df" }, { "url": "https://git.kernel.org/stable/c/de96dc11aee0d058927bff94a168e3c5c46483e2" }, { "url": "https://git.kernel.org/stable/c/e3b25bf2cf2496e85bc05b33360faf9fdf880e03" }, { "url": "https://git.kernel.org/stable/c/ee56b5e18f566c0b5a183379dcd63d402cebf2f8" }, { "url": "https://git.kernel.org/stable/c/24ffc919467d20951f0f132d1c75294e2e91e09b" }, { "url": "https://git.kernel.org/stable/c/bce07e2f37b5e4a427d36fd6b1c14067b27591db" } ], "title": "scsi: libiscsi_tcp: Check the data direction of a Data-In PDU", "x_generator": { "engine": "bippy-1.2.0" } } } }