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CVE-2026-72084 (GCVE-0-2026-72084)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:52 – Updated: 2026-08-23 12:46
VLAI
Title
scsi: target: Bound PR-OUT TransportID parsing to the received buffer
Summary
In the Linux kernel, the following vulnerability has been resolved: scsi: target: Bound PR-OUT TransportID parsing to the received buffer core_scsi3_decode_spec_i_port() and core_scsi3_emulate_register_and_move() hand the raw PERSISTENT RESERVE OUT parameter buffer to target_parse_pr_out_transport_id() without telling it how many bytes are valid. For an iSCSI TransportID (FORMAT CODE 01b), iscsi_parse_pr_out_transport_id() locates the ",i,0x" ISID separator with an unbounded strstr() (and on the error path prints the name with a further unbounded "%s"). An initiator can submit a TransportID whose iSCSI name contains neither a ",i,0x" substring nor a NUL terminator, filling the parameter list to its end, so the scan runs off the end of the buffer. When the parameter list spans more than one page the buffer is a multi-page vmap (transport_kmap_data_sg()), so the over-read walks into the trailing vmalloc guard page and oopses (KASAN: vmalloc-out-of-bounds in strstr). It is reachable by any fabric that delivers a PR OUT to a device exported through an iSCSI TPG, including a guest via vhost-scsi. Pass the number of received bytes down to the parser and validate the iSCSI TransportID's own self-described length (ADDITIONAL LENGTH + 4) once, up front: reject it if it is below the spc4r17 minimum or larger than the received buffer, then bound the separator search, the ISID walk and the name copy by that length. This is the length check the callers already perform after the parse (core_scsi3_decode_spec_i_port() compares tid_len against tpdl, core_scsi3_emulate_register_and_move() validates it against data_length), moved ahead of the scan. Also drop the unbounded "%s" of the unterminated name. Add per-format explicit name-length checks before copying into i_str, rather than silently truncating with min_t: for FORMAT CODE 00b reject if the descriptor body (tid_len - 4 bytes) cannot fit in i_str[TRANSPORT_IQN_LEN]; for FORMAT CODE 01b reject if the name portion (from &buf[4] up to the separator) cannot fit. Both checks make the bounds intent explicit at each format branch. While here, also reject a FORMAT CODE 01b TransportID whose ",i,0x" separator sits at the very end of the descriptor: that leaves an empty ISID and points the returned port nexus pointer at buf + tid_len, one past the descriptor, which the registration code (__core_scsi3_locate_pr_reg(), __core_scsi3_alloc_registration()) then dereferences as the ISID string -- the same over-read of the parameter buffer for a malformed descriptor.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 , < 88c67c3de914e19172e1d878a7625c5b06c20ec5 (git)
Affected: c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 , < 842248047ef28dbf3b3f7f49a0ec315054d4dab8 (git)
Affected: c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 , < 03fbc7de8d5e85fc8420e57e8304c855efd453ab (git)
Affected: c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 , < 6ca5de8782e67573a61a6736b6dc0ffe58dcdf59 (git)
Affected: c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 , < 9298078a8f7d8181a04614a34ab655ccdf038204 (git)
Affected: c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 , < 004ccd2d3b4ac36a300e05e01df152e5c02a5a82 (git)
Affected: c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 , < 555a89846ed888d7401b3f7200934c0fbedcbb46 (git)
Affected: c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5 , < d04a179085c262c9ed577d0a4cbc6482ff1fd9a3 (git)
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Linux Linux Affected: 2.6.38
Unaffected: 0 , < 2.6.38 (semver)
Unaffected: 5.10.266 , ≤ 5.10.* (semver)
Unaffected: 5.15.212 , ≤ 5.15.* (semver)
Unaffected: 6.1.178 , ≤ 6.1.* (semver)
Unaffected: 6.6.145 , ≤ 6.6.* (semver)
Unaffected: 6.12.97 , ≤ 6.12.* (semver)
Unaffected: 6.18.40 , ≤ 6.18.* (semver)
Unaffected: 7.1.5 , ≤ 7.1.* (semver)
Unaffected: 7.2 , ≤ * (original_commit_for_fix)
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nscsi: target: Bound PR-OUT TransportID parsing to the received buffer\n\ncore_scsi3_decode_spec_i_port() and core_scsi3_emulate_register_and_move()\nhand the raw PERSISTENT RESERVE OUT parameter buffer to\ntarget_parse_pr_out_transport_id() without telling it how many bytes are\nvalid.  For an iSCSI TransportID (FORMAT CODE 01b),\niscsi_parse_pr_out_transport_id() locates the \",i,0x\" ISID separator with\nan unbounded strstr() (and on the error path prints the name with a further\nunbounded \"%s\").  An initiator can submit a TransportID whose iSCSI name\ncontains neither a \",i,0x\" substring nor a NUL terminator, filling the\nparameter list to its end, so the scan runs off the end of the buffer.\n\nWhen the parameter list spans more than one page the buffer is a multi-page\nvmap (transport_kmap_data_sg()), so the over-read walks into the trailing\nvmalloc guard page and oopses (KASAN: vmalloc-out-of-bounds in strstr).  It\nis reachable by any fabric that delivers a PR OUT to a device exported\nthrough an iSCSI TPG, including a guest via vhost-scsi.\n\nPass the number of received bytes down to the parser and validate the iSCSI\nTransportID\u0027s own self-described length (ADDITIONAL LENGTH + 4) once, up\nfront: reject it if it is below the spc4r17 minimum or larger than the\nreceived buffer, then bound the separator search, the ISID walk and the\nname copy by that length.  This is the length check the callers already\nperform after the parse (core_scsi3_decode_spec_i_port() compares tid_len\nagainst tpdl, core_scsi3_emulate_register_and_move() validates it against\ndata_length), moved ahead of the scan.  Also drop the unbounded \"%s\" of the\nunterminated name.\n\nAdd per-format explicit name-length checks before copying into i_str,\nrather than silently truncating with min_t: for FORMAT CODE 00b reject if\nthe descriptor body (tid_len - 4 bytes) cannot fit in\ni_str[TRANSPORT_IQN_LEN]; for FORMAT CODE 01b reject if the name portion\n(from \u0026buf[4] up to the separator) cannot fit.  Both checks make the bounds\nintent explicit at each format branch.\n\nWhile here, also reject a FORMAT CODE 01b TransportID whose \",i,0x\"\nseparator sits at the very end of the descriptor: that leaves an empty ISID\nand points the returned port nexus pointer at buf + tid_len, one past the\ndescriptor, which the registration code (__core_scsi3_locate_pr_reg(),\n__core_scsi3_alloc_registration()) then dereferences as the ISID string --\nthe same over-read of the parameter buffer for a malformed descriptor."
        }
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            "baseSeverity": "CRITICAL",
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            "version": "3.1"
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              "value": "AV:N - The bug is triggered by a PERSISTENT RESERVE OUT SCSI command delivered over the LIO iSCSI target fabric (TCP/3260); remote initiators reach `iscsi_parse_pr_out_transport_id()` after login and normal SCSI command processing, and the fix commit notes the same path via vhost-scsi-backed exports.\nAC:L - An attacker fully controls the PR-OUT parameter list and can reliably supply a FORMAT CODE 01b iSCSI TransportID without a \",i,0x\" separator or NUL terminator and size it past one page so `strstr()` over-reads into the vmalloc guard page; no races or victim-specific memory layout are required.\nPR:N - Exploitation requires only completing iSCSI login to an exported LUN as any initiator client, not host administrator privileges; LIO demo mode auto-provisions initiator ACLs and many storage appliances expose iSCSI targets to the network without mapping this to elevated OS credentials.\nUI:N - No end-user or administrator action beyond normal automated iSCSI target operation is needed; a remote initiator can send the malicious PR OUT command directly once a session to the LUN exists.\nS:U - The flaw corrupts or reads kernel memory and crashes the target host kernel within the same kernel security boundary; it does not by itself cross a VM, container, or IOMMU isolation boundary to another authority.\nC:H - Unbounded `strstr()` and an unbounded `%s` on the error path perform out-of-bounds reads past the received PR-OUT buffer, potentially disclosing adjacent kernel memory before the fault, matching CVSS guidance for out-of-bounds reads beyond a few bytes.\nI:H - A malformed TransportID can leave the ISID pointer one byte past the descriptor so subsequent registration code dereferences out of bounds, and the ISID normalization loop can write with `tolower()` beyond the buffer, giving a memory-corruption primitive in kernel context.\nA:H - The over-read into a multi-page vmalloc mapping hits the guard page and triggers a KASAN vmalloc-out-of-bounds fault and kernel oops, remotely denying service to the host and all consumers of the iSCSI target."
            }
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        }
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      "providerMetadata": {
        "dateUpdated": "2026-08-23T12:46:46.221Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/88c67c3de914e19172e1d878a7625c5b06c20ec5"
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        {
          "url": "https://git.kernel.org/stable/c/842248047ef28dbf3b3f7f49a0ec315054d4dab8"
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          "url": "https://git.kernel.org/stable/c/03fbc7de8d5e85fc8420e57e8304c855efd453ab"
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        },
        {
          "url": "https://git.kernel.org/stable/c/d04a179085c262c9ed577d0a4cbc6482ff1fd9a3"
        }
      ],
      "title": "scsi: target: Bound PR-OUT TransportID parsing to the received buffer",
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    "assignerShortName": "Linux",
    "cveId": "CVE-2026-72084",
    "datePublished": "2026-08-15T05:52:32.789Z",
    "dateReserved": "2026-08-09T03:40:39.904Z",
    "dateUpdated": "2026-08-23T12:46:46.221Z",
    "state": "PUBLISHED"
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      "cve": "CVE-2026-72084",
      "date": "2026-09-10",
      "epss": "0.00745",
      "percentile": "0.52668"
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An initiator can submit a TransportID whose iSCSI name\\ncontains neither a \\\",i,0x\\\" substring nor a NUL terminator, filling the\\nparameter list to its end, so the scan runs off the end of the buffer.\\n\\nWhen the parameter list spans more than one page the buffer is a multi-page\\nvmap (transport_kmap_data_sg()), so the over-read walks into the trailing\\nvmalloc guard page and oopses (KASAN: vmalloc-out-of-bounds in strstr).  It\\nis reachable by any fabric that delivers a PR OUT to a device exported\\nthrough an iSCSI TPG, including a guest via vhost-scsi.\\n\\nPass the number of received bytes down to the parser and validate the iSCSI\\nTransportID\u0027s own self-described length (ADDITIONAL LENGTH + 4) once, up\\nfront: reject it if it is below the spc4r17 minimum or larger than the\\nreceived buffer, then bound the separator search, the ISID walk and the\\nname copy by that length.  This is the length check the callers already\\nperform after the parse (core_scsi3_decode_spec_i_port() compares tid_len\\nagainst tpdl, core_scsi3_emulate_register_and_move() validates it against\\ndata_length), moved ahead of the scan.  Also drop the unbounded \\\"%s\\\" of the\\nunterminated name.\\n\\nAdd per-format explicit name-length checks before copying into i_str,\\nrather than silently truncating with min_t: for FORMAT CODE 00b reject if\\nthe descriptor body (tid_len - 4 bytes) cannot fit in\\ni_str[TRANSPORT_IQN_LEN]; for FORMAT CODE 01b reject if the name portion\\n(from \u0026buf[4] up to the separator) cannot fit.  Both checks make the bounds\\nintent explicit at each format branch.\\n\\nWhile here, also reject a FORMAT CODE 01b TransportID whose \\\",i,0x\\\"\\nseparator sits at the very end of the descriptor: that leaves an empty ISID\\nand points the returned port nexus pointer at buf + tid_len, one past the\\ndescriptor, which the registration code (__core_scsi3_locate_pr_reg(),\\n__core_scsi3_alloc_registration()) then dereferences as the ISID string --\\nthe same over-read of the parameter buffer for a malformed descriptor.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/target/target_core_fabric_lib.c\",\"drivers/target/target_core_internal.h\",\"drivers/target/target_core_pr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5\",\"lessThan\":\"88c67c3de914e19172e1d878a7625c5b06c20ec5\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5\",\"lessThan\":\"842248047ef28dbf3b3f7f49a0ec315054d4dab8\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5\",\"lessThan\":\"03fbc7de8d5e85fc8420e57e8304c855efd453ab\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5\",\"lessThan\":\"6ca5de8782e67573a61a6736b6dc0ffe58dcdf59\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5\",\"lessThan\":\"9298078a8f7d8181a04614a34ab655ccdf038204\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5\",\"lessThan\":\"004ccd2d3b4ac36a300e05e01df152e5c02a5a82\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5\",\"lessThan\":\"555a89846ed888d7401b3f7200934c0fbedcbb46\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"c66ac9db8d4ad9994a02b3e933ea2ccc643e1fe5\",\"lessThan\":\"d04a179085c262c9ed577d0a4cbc6482ff1fd9a3\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/target/target_core_fabric_lib.c\",\"drivers/target/target_core_internal.h\",\"drivers/target/target_core_pr.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.38\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.38\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.10.266\",\"lessThanOrEqual\":\"5.10.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"5.15.212\",\"lessThanOrEqual\":\"5.15.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.1.178\",\"lessThanOrEqual\":\"6.1.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.6.145\",\"lessThanOrEqual\":\"6.6.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.12.97\",\"lessThanOrEqual\":\"6.12.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.40\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.1.5\",\"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:H/A:H\",\"baseScore\":9.8,\"baseSeverity\":\"CRITICAL\",\"attackVector\":\"NETWORK\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"NONE\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":3.9,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/004ccd2d3b4ac36a300e05e01df152e5c02a5a82\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/03fbc7de8d5e85fc8420e57e8304c855efd453ab\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/555a89846ed888d7401b3f7200934c0fbedcbb46\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/6ca5de8782e67573a61a6736b6dc0ffe58dcdf59\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/842248047ef28dbf3b3f7f49a0ec315054d4dab8\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/88c67c3de914e19172e1d878a7625c5b06c20ec5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/9298078a8f7d8181a04614a34ab655ccdf038204\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/d04a179085c262c9ed577d0a4cbc6482ff1fd9a3\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-08-17T20:45:35+00:00",
      "cve": "CVE-2026-72084",
      "id": "CVE-2026-72084",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "260",
      "product_status:under_investigation": "14",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: scsi: target: Bound PR-OUT TransportID parsing to the received buffer",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-72084.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "important",
      "current_release_date": "2026-09-09T00:02:12Z",
      "cve": "CVE-2026-72084",
      "id": "CVE-2026-72084",
      "initial_release_date": "2026-08-18T16:54:58Z",
      "product_status:first_fixed": "114",
      "product_status:known_affected": "345",
      "product_status:recommended": "11",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-72084",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-72084.json",
      "version": "3"
    }
  }
}



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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.