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CVE-2026-74557 (GCVE-0-2026-74557)

Vulnerability from cvelistv5 – Published: 2026-08-15 12:28 – Updated: 2026-08-19 16:38
VLAI
Title
scsi: libiscsi: Fix stale-data leak into the SCSI sense buffer
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: libiscsi: Fix stale-data leak into the SCSI sense buffer iscsi_scsi_cmd_rsp() copies the sense data of a SCSI Response from the target-supplied data segment. The segment carries a 2-byte sense length followed by the sense bytes, so it must hold 2 + senselen bytes, but the bounds check only requires datalen >= senselen: senselen = get_unaligned_be16(data); if (datalen < senselen) goto invalid_datalen; memcpy(sc->sense_buffer, data + 2, min_t(uint16_t, senselen, SCSI_SENSE_BUFFERSIZE)); A target that returns a SCSI Response whose datalen equals senselen (with senselen <= SCSI_SENSE_BUFFERSIZE) makes the memcpy() from data + 2 read up to two bytes past the received data. Those bytes are stale conn->data contents and end up in the command's sense buffer, which is returned to userspace. Account for the 2-byte sense length prefix in the check.
Severity
7.5 (High)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:N
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 , < 812f1ae95b22419422972748f173b0916ee4d621 (git)
Affected: 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 , < fef6167e8149896cd81bea333fd51b1c91239149 (git)
Affected: 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 , < baa04572673125e4d5bc309b4077d1cb46cc78d1 (git)
Affected: 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 , < 7567f06abdefb1caf2d836107c4d08c5185c650e (git)
Affected: 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 , < 60499924faf4ef97e84228c20515218ef121facf (git)
Affected: 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 , < 3ef209ca0b4b68c75e9a814d90cc916026b5a6ac (git)
Affected: 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 , < 1f07a897d43c63e6c9458bf77450defef39b5833 (git)
Affected: 7996a778ff8c717cb1a7a294475c59cc8f1e9fb8 , < 98b87885de4b7f605533a2860685f5689fce8e82 (git)
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Linux Linux Affected: 2.6.18
Unaffected: 0 , < 2.6.18 (semver)
Unaffected: 5.10.265 , ≤ 5.10.* (semver)
Unaffected: 5.15.216 , ≤ 5.15.* (semver)
Unaffected: 6.1.183 , ≤ 6.1.* (semver)
Unaffected: 6.6.151 , ≤ 6.6.* (semver)
Unaffected: 6.12.103 , ≤ 6.12.* (semver)
Unaffected: 6.18.44 , ≤ 6.18.* (semver)
Unaffected: 7.1.8 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "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 \u003e= senselen:\n\n\tsenselen = get_unaligned_be16(data);\n\tif (datalen \u003c senselen)\n\t\tgoto invalid_datalen;\n\tmemcpy(sc-\u003esense_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 \u003c= SCSI_SENSE_BUFFERSIZE) makes the memcpy() from data +\n2 read up to two bytes past the received data.  Those bytes are stale\nconn-\u003edata contents and end up in the command\u0027s sense buffer, which is\nreturned to userspace.\n\nAccount for the 2-byte sense length prefix in the check."
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              "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-\u003edata 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-\u003edata kernel heap memory into sc-\u003esense_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."
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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 \u003e= senselen:\\n\\n\\tsenselen = get_unaligned_be16(data);\\n\\tif (datalen \u003c senselen)\\n\\t\\tgoto invalid_datalen;\\n\\tmemcpy(sc-\u003esense_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 \u003c= SCSI_SENSE_BUFFERSIZE) makes the memcpy() from data +\\n2 read up to two bytes past the received data.  Those bytes are stale\\nconn-\u003edata contents and end up in the command\u0027s sense buffer, which is\\nreturned to userspace.\\n\\nAccount for the 2-byte sense length prefix in the check.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/scsi/libiscsi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"7996a778ff8c717cb1a7a294475c59cc8f1e9fb8\",\"lessThan\":\"812f1ae95b22419422972748f173b0916ee4d621\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7996a778ff8c717cb1a7a294475c59cc8f1e9fb8\",\"lessThan\":\"fef6167e8149896cd81bea333fd51b1c91239149\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7996a778ff8c717cb1a7a294475c59cc8f1e9fb8\",\"lessThan\":\"baa04572673125e4d5bc309b4077d1cb46cc78d1\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7996a778ff8c717cb1a7a294475c59cc8f1e9fb8\",\"lessThan\":\"7567f06abdefb1caf2d836107c4d08c5185c650e\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7996a778ff8c717cb1a7a294475c59cc8f1e9fb8\",\"lessThan\":\"60499924faf4ef97e84228c20515218ef121facf\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7996a778ff8c717cb1a7a294475c59cc8f1e9fb8\",\"lessThan\":\"3ef209ca0b4b68c75e9a814d90cc916026b5a6ac\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7996a778ff8c717cb1a7a294475c59cc8f1e9fb8\",\"lessThan\":\"1f07a897d43c63e6c9458bf77450defef39b5833\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"7996a778ff8c717cb1a7a294475c59cc8f1e9fb8\",\"lessThan\":\"98b87885de4b7f605533a2860685f5689fce8e82\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/scsi/libiscsi.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.18\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.18\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.265\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.216\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.183\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.151\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.103\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.44\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.8\",\"lessThanOrEqual\":\"7.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2\",\"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:H/I:N/A:N\",\"baseScore\":7.5,\"baseSeverity\":\"HIGH\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"NONE\",\"availabilityImpact\":\"NONE\"},\"exploitabilityScore\":3.9,\"impactScore\":3.6}]},\"references\":[{\"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\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
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      "current_release_date": "2026-08-26T18:52:31+00:00",
      "cve": "CVE-2026-74557",
      "id": "CVE-2026-74557",
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      "version": "3"
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      "cve": "CVE-2026-74557",
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      "initial_release_date": "2026-08-15T23:50:18Z",
      "product_status:known_affected": "284",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-74557",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-74557.json",
      "version": "4"
    }
  }
}



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Tags
Taxonomy of the tags.





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.