{"dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": {"cveId": "CVE-2026-74557", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-08-15T05:44:03.916Z", "datePublished": "2026-08-15T12:28:01.988Z", "dateUpdated": "2026-08-19T16:38:59.951Z"}, "containers": {"cna": {"providerMetadata": {"orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-08-19T16:38:59.951Z"}, "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: libiscsi: Fix stale-data leak into the SCSI sense buffer\n\niscsi_scsi_cmd_rsp() copies the sense data of a SCSI Response from the\ntarget-supplied data segment. The segment carries a 2-byte sense length\nfollowed by the sense bytes, so it must hold 2 + senselen bytes, but the\nbounds check only requires datalen >= senselen:\n\n\tsenselen = get_unaligned_be16(data);\n\tif (datalen < senselen)\n\t\tgoto invalid_datalen;\n\tmemcpy(sc->sense_buffer, data + 2,\n\t min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));\n\nA target that returns a SCSI Response whose datalen equals senselen\n(with senselen <= SCSI_SENSE_BUFFERSIZE) makes the memcpy() from data +\n2 read up to two bytes past the received data. Those bytes are stale\nconn->data contents and end up in the command's sense buffer, which is\nreturned to userspace.\n\nAccount for the 2-byte sense length prefix in the check."}], "metrics": [{"cvssV3_1": {"version": "3.1", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "baseScore": 7.5, "baseSeverity": "HIGH"}, "scenarios": [{"lang": "en", "value": "AV:N - A remote malicious or compromised iSCSI target can trigger the bug by sending a crafted SCSI Command Response over the standard iSCSI/TCP session to a Linux kernel initiator, with no local access required on the victim host.\nAC:L - The attacker fully controls the response PDU fields (datalen, sense length, CHECK_CONDITION status) and can reliably set datalen equal to senselen so the flawed bounds check passes and stale conn->data bytes are copied into the sense buffer.\nPR:N - Exploitation requires only the ability to act as the iSCSI target on the network; the attacker needs no local account, capabilities, or privileges on the victim system initiating the connection.\nUI:N - Once an iSCSI session exists, the leak is triggered automatically on SCSI command responses with no further victim action; the attacker does not rely on a user opening a file, clicking a link, or performing any interactive step at exploit time.\nS:U - The flaw discloses kernel memory contents into a SCSI sense buffer returned within the same host security domain; it does not cross VM, hypervisor, or IOMMU boundaries and is a standard kernel-to-userspace information leak.\nC:H - The out-of-bounds memcpy reads up to two bytes per response from stale conn->data kernel heap memory into sc->sense_buffer, which is copied to userspace via SCSI completion, ioctl, and BSG paths, enabling repeated kernel information disclosure.\nI:N - The vulnerability is a read-only out-of-bounds memcpy from the receive buffer into the sense buffer; it does not corrupt kernel structures, overwrite memory, or provide a write or code-execution primitive.\nA:N - The bug causes no kernel panic, oops, or hang; invalid responses are handled gracefully and exploitation only leaks data into the sense buffer without disrupting system availability."}]}], "affected": [{"product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": ["drivers/scsi/libiscsi.c"], "versions": [{"version": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8", "lessThan": "812f1ae95b22419422972748f173b0916ee4d621", "status": "affected", "versionType": "git"}, {"version": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8", "lessThan": "fef6167e8149896cd81bea333fd51b1c91239149", "status": "affected", "versionType": "git"}, {"version": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8", "lessThan": "baa04572673125e4d5bc309b4077d1cb46cc78d1", "status": "affected", "versionType": "git"}, {"version": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8", "lessThan": 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"2.6.18", "status": "unaffected", "versionType": "semver"}, {"version": "5.10.265", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver"}, {"version": "5.15.216", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.1.183", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.6.151", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.12.103", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver"}, {"version": "6.18.44", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.1.8", "lessThanOrEqual": "7.1.*", "status": "unaffected", "versionType": "semver"}, {"version": "7.2", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix"}]}], "cpeApplicability": [{"nodes": [{"operator": "OR", "negate": false, "cpeMatch": [{"vulnerable": true, "criteria": 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{"affected": [{"affectedData": [{"defaultStatus": "unaffected", "product": "Linux", "programFiles": ["drivers/scsi/libiscsi.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"lessThan": "812f1ae95b22419422972748f173b0916ee4d621", "status": "affected", "version": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8", "versionType": "git"}, {"lessThan": "fef6167e8149896cd81bea333fd51b1c91239149", "status": "affected", "version": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8", "versionType": "git"}, {"lessThan": "baa04572673125e4d5bc309b4077d1cb46cc78d1", "status": "affected", "version": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8", "versionType": "git"}, {"lessThan": "7567f06abdefb1caf2d836107c4d08c5185c650e", "status": "affected", "version": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8", "versionType": "git"}, {"lessThan": "60499924faf4ef97e84228c20515218ef121facf", "status": "affected", "version": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8", "versionType": "git"}, {"lessThan": "3ef209ca0b4b68c75e9a814d90cc916026b5a6ac", "status": "affected", "version": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8", "versionType": "git"}, {"lessThan": "1f07a897d43c63e6c9458bf77450defef39b5833", "status": "affected", "version": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8", "versionType": "git"}, {"lessThan": "98b87885de4b7f605533a2860685f5689fce8e82", "status": "affected", "version": "7996a778ff8c717cb1a7a294475c59cc8f1e9fb8", "versionType": "git"}]}, {"defaultStatus": "affected", "product": "Linux", "programFiles": ["drivers/scsi/libiscsi.c"], "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "vendor": "Linux", "versions": [{"status": "affected", "version": "2.6.18"}, {"lessThan": "2.6.18", "status": "unaffected", "version": "0", "versionType": "semver"}, {"lessThanOrEqual": "5.10.*", "status": "unaffected", "version": "5.10.265", "versionType": "semver"}, {"lessThanOrEqual": "5.15.*", "status": "unaffected", "version": "5.15.216", "versionType": "semver"}, {"lessThanOrEqual": "6.1.*", "status": "unaffected", "version": "6.1.183", "versionType": "semver"}, {"lessThanOrEqual": "6.6.*", "status": "unaffected", "version": "6.6.151", "versionType": "semver"}, {"lessThanOrEqual": "6.12.*", "status": "unaffected", "version": "6.12.103", "versionType": "semver"}, {"lessThanOrEqual": "6.18.*", "status": "unaffected", "version": "6.18.44", "versionType": "semver"}, {"lessThanOrEqual": "7.1.*", "status": "unaffected", "version": "7.1.8", "versionType": "semver"}, {"lessThanOrEqual": "*", "status": "unaffected", "version": "7.2", "versionType": "original_commit_for_fix"}]}], "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"}], "cveTags": [], "descriptions": [{"lang": "en", "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: libiscsi: Fix stale-data leak into the SCSI sense buffer\n\niscsi_scsi_cmd_rsp() copies the sense data of a SCSI Response from the\ntarget-supplied data segment. The segment carries a 2-byte sense length\nfollowed by the sense bytes, so it must hold 2 + senselen bytes, but the\nbounds check only requires datalen >= senselen:\n\n\tsenselen = get_unaligned_be16(data);\n\tif (datalen < senselen)\n\t\tgoto invalid_datalen;\n\tmemcpy(sc->sense_buffer, data + 2,\n\t min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));\n\nA target that returns a SCSI Response whose datalen equals senselen\n(with senselen <= SCSI_SENSE_BUFFERSIZE) makes the memcpy() from data +\n2 read up to two bytes past the received data. Those bytes are stale\nconn->data contents and end up in the command's sense buffer, which is\nreturned to userspace.\n\nAccount for the 2-byte sense length prefix in the check."}], "id": "CVE-2026-74557", "lastModified": "2026-08-19T17:21:10.927", "metrics": {"cvssMetricV31": [{"cvssData": {"attackComplexity": "LOW", "attackVector": "NETWORK", "availabilityImpact": "NONE", "baseScore": 7.5, "baseSeverity": "HIGH", "confidentialityImpact": "HIGH", "integrityImpact": "NONE", "privilegesRequired": "NONE", "scope": "UNCHANGED", "userInteraction": "NONE", "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N", "version": "3.1"}, "exploitabilityScore": 3.9, "impactScore": 3.6, "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "type": "Secondary"}]}, "published": "2026-08-15T13:18:01.160", "references": [{"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/1f07a897d43c63e6c9458bf77450defef39b5833"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/3ef209ca0b4b68c75e9a814d90cc916026b5a6ac"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/60499924faf4ef97e84228c20515218ef121facf"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/7567f06abdefb1caf2d836107c4d08c5185c650e"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/812f1ae95b22419422972748f173b0916ee4d621"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/98b87885de4b7f605533a2860685f5689fce8e82"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/baa04572673125e4d5bc309b4077d1cb46cc78d1"}, {"source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "url": "https://git.kernel.org/stable/c/fef6167e8149896cd81bea333fd51b1c91239149"}], "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "vulnStatus": "Received"}

{"bugzilla": {"description": "kernel: scsi: libiscsi: Fix stale-data leak into the SCSI sense buffer", "id": "2517034", "url": "https://bugzilla.redhat.com/show_bug.cgi?id=2517034"}, "csaw": false, "cvss3": {"cvss3_base_score": "7.0", "cvss3_scoring_vector": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H", "status": "draft"}, "cwe": "CWE-125", "details": ["In the Linux kernel, the following vulnerability has been resolved:\nscsi: libiscsi: Fix stale-data leak into the SCSI sense buffer\niscsi_scsi_cmd_rsp() copies the sense data of a SCSI Response from the\ntarget-supplied data segment. The segment carries a 2-byte sense length\nfollowed by the sense bytes, so it must hold 2 + senselen bytes, but the\nbounds check only requires datalen >= senselen:\nsenselen = get_unaligned_be16(data);\nif (datalen < senselen)\ngoto invalid_datalen;\nmemcpy(sc->sense_buffer, data + 2,\nmin_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE));\nA target that returns a SCSI Response whose datalen equals senselen\n(with senselen <= SCSI_SENSE_BUFFERSIZE) makes the memcpy() from data +\n2 read up to two bytes past the received data. Those bytes are stale\nconn->data contents and end up in the command's sense buffer, which is\nreturned to userspace.\nAccount for the 2-byte sense length prefix in the check.", "A flaw was found in the Linux kernel's libiscsi component. An incorrect bounds check in the `iscsi_scsi_cmd_rsp()` function allows a malicious iSCSI target to craft a SCSI Response. This can lead to a read beyond the intended buffer, causing stale connection data to be copied into the SCSI sense buffer and subsequently returned to userspace, potentially disclosing sensitive information."], "name": "CVE-2026-74557", "public_date": "2026-08-15T00:00:00Z", "references": ["https://www.cve.org/CVERecord?id=CVE-2026-74557\nhttps://nvd.nist.gov/vuln/detail/CVE-2026-74557\nhttps://lore.kernel.org/linux-cve-announce/2026081551-CVE-2026-74557-6742@gregkh/T"], "threat_severity": "Moderate"}

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