Vulnerability-Lookup

FKIE_CVE-2026-53176

Vulnerability from fkie_nvd - Published: 2026-06-25 09:16 - Updated: 2026-09-18 13:18

Severity

9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
6.5 (Medium) - CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN In drivers/infiniband/ulp/isert/ib_isert.c, isert_login_recv_done() computes the login request payload length as wc->byte_len minus ISER_HEADERS_LEN with no lower bound, and login_req_len is a signed int. A remote iSER initiator can post a login Send work request carrying fewer than ISER_HEADERS_LEN (76) bytes, so the subtraction underflows and login_req_len becomes negative. isert_rx_login_req() then reads that negative length back into a signed int, takes size = min(rx_buflen, MAX_KEY_VALUE_PAIRS), and because the min() is signed it keeps the negative value; the value is then passed as the memcpy() length and sign-extended to a multi-gigabyte size_t. The copy into the 8192-byte login->req_buf runs far out of bounds and faults, crashing the target node. The login phase precedes iSCSI authentication, so no credentials are required to reach this path. Reject any login PDU shorter than ISER_HEADERS_LEN before the subtraction, mirroring the existing early return on a failed work completion, so login_req_len can never go negative. The upper bound was already safe: a posted login buffer cannot deliver more than ISER_RX_PAYLOAD_SIZE, so the difference stays at or below MAX_KEY_VALUE_PAIRS and the existing min() clamps it; only the missing lower bound needs to be added.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1ca40b243277c9e88be5e00bd3e083f71aefb93e	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/29e7b925ae6df64894e82ab6419994dc25580a8a	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefb	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/bd22740d7f14cb1c0289444cfd2c8d2938667c1d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c1234229399f4af12c553b1b0ffd978eeba65548	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/df422fd273c96c2ee5beb80fc21adc8c70c29260	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/e8a013c0c3ca2f6708341a56612a3f6d6921620a	Patch
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:68507
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:68531
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:68532
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:68570
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-53176	Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2492741	Issue Tracking, Third Party Advisory
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-53176.json	Third Party Advisory

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1
linux	linux_kernel	7.1

JSON

To clipboard

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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nIB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN\n\nIn drivers/infiniband/ulp/isert/ib_isert.c, isert_login_recv_done()\ncomputes the login request payload length as wc-\u003ebyte_len minus\nISER_HEADERS_LEN with no lower bound, and login_req_len is a signed int.\nA remote iSER initiator can post a login Send work request carrying\nfewer than ISER_HEADERS_LEN (76) bytes, so the subtraction underflows\nand login_req_len becomes negative.\n\nisert_rx_login_req() then reads that negative length back into a signed\nint, takes size = min(rx_buflen, MAX_KEY_VALUE_PAIRS), and because the\nmin() is signed it keeps the negative value; the value is then passed as\nthe memcpy() length and sign-extended to a multi-gigabyte size_t. The\ncopy into the 8192-byte login-\u003ereq_buf runs far out of bounds and\nfaults, crashing the target node. The login phase precedes iSCSI\nauthentication, so no credentials are required to reach this path.\n\nReject any login PDU shorter than ISER_HEADERS_LEN before the\nsubtraction, mirroring the existing early return on a failed work\ncompletion, so login_req_len can never go negative. The upper bound was\nalready safe: a posted login buffer cannot deliver more than\nISER_RX_PAYLOAD_SIZE, so the difference stays at or below\nMAX_KEY_VALUE_PAIRS and the existing min() clamps it; only the missing\nlower bound needs to be added."
    }
  ],
  "id": "CVE-2026-53176",
  "lastModified": "2026-09-18T13:18:32.900",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 9.8,
          "baseSeverity": "CRITICAL",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
        },
        "exploitabilityScore": 3.9,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      },
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "ADJACENT_NETWORK",
          "availabilityImpact": "HIGH",
          "baseScore": 6.5,
          "baseSeverity": "MEDIUM",
          "confidentialityImpact": "NONE",
          "integrityImpact": "NONE",
          "privilegesRequired": "NONE",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H",
          "version": "3.1"
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        "exploitabilityScore": 2.8,
        "impactScore": 3.6,
        "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
        "type": "Secondary"
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  "published": "2026-06-25T09:16:34.953",
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CVE-2026-53176 (GCVE-0-2026-53176)

Vulnerability from cvelistv5 – Published: 2026-06-25 08:38 – Updated: 2026-09-18 12:04

Title

IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN

Summary

Severity

9.8 (Critical)


                        
                          CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H

6.5 (Medium)


                        
                          CVSS:3.1/AV:A/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H

CWE

CWE-839 - Numeric Range Comparison Without Minimum Check

Assigner

Linux mitre root Scorecard

References

15 references

URL	Tags
https://git.kernel.org/stable/c/75ee6e4aa096aa9e7…
https://git.kernel.org/stable/c/e8a013c0c3ca2f670…
https://git.kernel.org/stable/c/bd22740d7f14cb1c0…
https://git.kernel.org/stable/c/c1234229399f4af12…
https://git.kernel.org/stable/c/c5584e089b5af7b3b…
https://git.kernel.org/stable/c/df422fd273c96c2ee…
https://git.kernel.org/stable/c/1ca40b243277c9e88…
https://git.kernel.org/stable/c/29e7b925ae6df6489…
https://access.redhat.com/security/cve/CVE-2026-53176	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2492741	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:68507	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:68570	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:68531	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:68532	vendor-advisoryx_refsource_REDHAT

Impacted products

9 products

Vendor	Product	Version
Linux	Linux	Affected: b8d26b3be8b33682cf163274ed07479a70554633 , < 75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefb (git) Affected: b8d26b3be8b33682cf163274ed07479a70554633 , < e8a013c0c3ca2f6708341a56612a3f6d6921620a (git) Affected: b8d26b3be8b33682cf163274ed07479a70554633 , < bd22740d7f14cb1c0289444cfd2c8d2938667c1d (git) Affected: b8d26b3be8b33682cf163274ed07479a70554633 , < c1234229399f4af12c553b1b0ffd978eeba65548 (git) Affected: b8d26b3be8b33682cf163274ed07479a70554633 , < c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47 (git) Affected: b8d26b3be8b33682cf163274ed07479a70554633 , < df422fd273c96c2ee5beb80fc21adc8c70c29260 (git) Affected: b8d26b3be8b33682cf163274ed07479a70554633 , < 1ca40b243277c9e88be5e00bd3e083f71aefb93e (git) Affected: b8d26b3be8b33682cf163274ed07479a70554633 , < 29e7b925ae6df64894e82ab6419994dc25580a8a (git)
Linux	Linux	Affected: 3.10 Unaffected: 0 , < 3.10 (semver) Unaffected: 5.10.259 , ≤ 5.10.* (semver) Unaffected: 5.15.210 , ≤ 5.15.* (semver) Unaffected: 6.1.176 , ≤ 6.1.* (semver) Unaffected: 6.6.143 , ≤ 6.6.* (semver) Unaffected: 6.12.94 , ≤ 6.12.* (semver) Unaffected: 6.18.36 , ≤ 6.18.* (semver) Unaffected: 7.0.13 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Red Hat	Red Hat Enterprise Linux 10	Unaffected: 0:6.12.0-211.56.1.el10_2 , < * (rpm) cpe:/o:redhat:enterprise_linux:10.2
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:4.18.0-553.164.1.rt7.505.el8_10 , < * (rpm) cpe:/a:redhat:enterprise_linux:8::nfv
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:4.18.0-553.164.1.el8_10 , < * (rpm) cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:5.14.0-687.49.1.el9_8 , < * (rpm) cpe:/a:redhat:enterprise_linux:9 cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 7	cpe:/o:redhat:enterprise_linux:7
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9

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              "value": "AV:N - The vulnerable code is reached by a remote iSER initiator over an RDMA/iSER target portal using RDMA CM and posted Send login PDUs. This is network protocol input to a kernel storage target service.\nAC:L - The attacker only needs to establish an iSER connection and send a login PDU shorter than ISER_HEADERS_LEN. No race or condition outside the attacker\u0027s control is required.\nPR:N - The vulnerable memcpy occurs during iSCSI login processing before CHAP/authentication, initiator ACL checks, and normal session authorization complete. No credentials are required.\nUI:N - Exploitation is triggered solely by attacker-sent network/RDMA traffic to the exposed target portal. No victim user action is required.\nS:U - The impact is within the kernel and target host security authority. There is no VM, IOMMU, or other cross-scope boundary involved.\nC:H - The signed underflow drives an out-of-bounds kernel memcpy that reads far beyond the receive buffer. As kernel memory corruption with an out-of-bounds read component, high confidentiality impact is the higher defensible choice.\nI:H - The same oversized memcpy writes far beyond the 8192-byte login request buffer into adjacent kernel memory. This is an out-of-bounds write and may be exploitable for kernel memory corruption, so integrity impact is high.\nA:H - The commit and code path show the huge memcpy faults and crashes the iSER target node. A remote unauthenticated attacker can repeatedly trigger kernel oops/panic-level denial of service."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:33:45.742Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/75ee6e4aa096aa9e7b2dd5c8ff98356e30aceefb"
        },
        {
          "url": "https://git.kernel.org/stable/c/e8a013c0c3ca2f6708341a56612a3f6d6921620a"
        },
        {
          "url": "https://git.kernel.org/stable/c/bd22740d7f14cb1c0289444cfd2c8d2938667c1d"
        },
        {
          "url": "https://git.kernel.org/stable/c/c1234229399f4af12c553b1b0ffd978eeba65548"
        },
        {
          "url": "https://git.kernel.org/stable/c/c5584e089b5af7b3bf8bd5e8ca0560cbf32b0a47"
        },
        {
          "url": "https://git.kernel.org/stable/c/df422fd273c96c2ee5beb80fc21adc8c70c29260"
        },
        {
          "url": "https://git.kernel.org/stable/c/1ca40b243277c9e88be5e00bd3e083f71aefb93e"
        },
        {
          "url": "https://git.kernel.org/stable/c/29e7b925ae6df64894e82ab6419994dc25580a8a"
        }
      ],
      "title": "IB/isert: Reject login PDUs shorter than ISER_HEADERS_LEN",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-53176",
    "datePublished": "2026-06-25T08:38:52.693Z",
    "dateReserved": "2026-06-09T07:44:35.389Z",
    "dateUpdated": "2026-09-18T12:04:40.163Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

Sightings

Author	Source	Type	Date	Other

Nomenclature

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Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
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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.

The MITRE ATT&CK techniques below are AI-generated suggestions, inferred from the description of the vulnerability by the CIRCL/vulnerability-attack-technique-classification-roberta-base model, served locally by ML-Gateway. They have not been verified by an analyst and are provided for guidance only.
The approach is described in our paper Mapping CVEs to MITRE ATT&CK Techniques: A Curated Gold-Set Classifier and the Limits of LLM-Assisted Label Expansion.
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Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.

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FKIE_CVE-2026-53176

CVE-2026-53176 (GCVE-0-2026-53176)

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Sightings

Nomenclature

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