Vulnerability-Lookup

FKIE_CVE-2026-46181

Vulnerability from fkie_nvd - Published: 2026-05-28 10:16 - Updated: 2026-07-20 12:19

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
7.0 (High) - CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event() Sashiko points out the radix_tree itself is RCU safe, but nothing ever frees the mlx4_srq struct with RCU, and it isn't even accessed within the RCU critical section. It also will crash if an event is delivered before the srq object is finished initializing. Use the spinlock since it isn't easy to make RCU work, use refcount_inc_not_zero() to protect against partially initialized objects, and order the refcount_set() to be after the srq is fully initialized.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1e2a44875b6afb4add1115f7f3351dcbeb6f273d	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/8b7833f3bce35cb0d01c1503781523c099c675f0	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c9341307ea16b9395c2e4c9c94d8499d91fe31d0	Patch
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:25120
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:25121
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:25217
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:33900
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:34094
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:34095
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:34443
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:35863
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:35894
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:35896
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:36216
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/errata/RHSA-2026:41236
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://access.redhat.com/security/cve/CVE-2026-46181
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://bugzilla.redhat.com/show_bug.cgi?id=2482532
0b0ca135-0b70-47e7-9f44-1890c2a1c46c	https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-46181.json

Impacted products

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

JSON

To clipboard

{
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          "product": "Linux",
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            "drivers/net/ethernet/mellanox/mlx4/srq.c"
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  "configurations": [
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      "nodes": [
        {
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  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()\n\nSashiko points out the radix_tree itself is RCU safe, but nothing ever\nfrees the mlx4_srq struct with RCU, and it isn\u0027t even accessed within the\nRCU critical section. It also will crash if an event is delivered before\nthe srq object is finished initializing.\n\nUse the spinlock since it isn\u0027t easy to make RCU work, use\nrefcount_inc_not_zero() to protect against partially initialized objects,\nand order the refcount_set() to be after the srq is fully initialized."
    }
  ],
  "id": "CVE-2026-46181",
  "lastModified": "2026-07-20T12:19:32.750",
  "metrics": {
    "cvssMetricV31": [
      {
        "cvssData": {
          "attackComplexity": "LOW",
          "attackVector": "LOCAL",
          "availabilityImpact": "HIGH",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "version": "3.1"
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        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
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          "availabilityImpact": "HIGH",
          "baseScore": 7.0,
          "baseSeverity": "HIGH",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "privilegesRequired": "LOW",
          "scope": "UNCHANGED",
          "userInteraction": "NONE",
          "vectorString": "CVSS:3.1/AV:L/AC:H/PR:L/UI:N/S:U/C:H/I:H/A:H",
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        "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
        "type": "Secondary"
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  "published": "2026-05-28T10:16:33.743",
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  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Modified",
  "weaknesses": [
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          "value": "NVD-CWE-noinfo"
        }
      ],
      "source": "nvd@nist.gov",
      "type": "Primary"
    },
    {
      "description": [
        {
          "lang": "en",
          "value": "CWE-366"
        }
      ],
      "source": "0b0ca135-0b70-47e7-9f44-1890c2a1c46c",
      "type": "Secondary"
    }
  ]
}

CVE-2026-46181 (GCVE-0-2026-46181)

Vulnerability from cvelistv5 – Published: 2026-05-28 09:36 – Updated: 2026-09-15 12:04

Title

RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()

Summary

Severity

7.8 (High)


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

7 (High)


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

CWE

CWE-366 - Race Condition within a Thread

Assigner

Linux CNA under the mitre root

CNA scorecard D 53/100 over 6665 records in the last 180 days details

References

18 references

URL	Tags
https://git.kernel.org/stable/c/1e2a44875b6afb4ad…
https://git.kernel.org/stable/c/8b7833f3bce35cb0d…
https://git.kernel.org/stable/c/c9341307ea16b9395…
https://access.redhat.com/security/cve/CVE-2026-46181	vdb-entryx_refsource_REDHAT
https://bugzilla.redhat.com/show_bug.cgi?id=2482532	issue-trackingx_refsource_REDHAT
https://security.access.redhat.com/data/csaf/v2/v…	x_sadp-csaf-vex
https://access.redhat.com/errata/RHSA-2026:36216	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:41236	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34095	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34443	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:34094	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25217	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25121	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35896	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35894	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:35863	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:25120	vendor-advisoryx_refsource_REDHAT
https://access.redhat.com/errata/RHSA-2026:33900	vendor-advisoryx_refsource_REDHAT

Impacted products

20 products

Vendor	Product	Version
Linux	Linux	Affected: 30353bfc43a1602c020f31d95cf27182ffd23824 , < 1e2a44875b6afb4add1115f7f3351dcbeb6f273d (git) Affected: 30353bfc43a1602c020f31d95cf27182ffd23824 , < 8b7833f3bce35cb0d01c1503781523c099c675f0 (git) Affected: 30353bfc43a1602c020f31d95cf27182ffd23824 , < c9341307ea16b9395c2e4c9c94d8499d91fe31d0 (git)
Linux	Linux	Affected: 4.9 Unaffected: 0 , < 4.9 (semver) Unaffected: 6.18.30 , ≤ 6.18.* (semver) Unaffected: 7.0.7 , ≤ 7.0.* (semver) Unaffected: 7.1 , ≤ * (original_commit_for_fix)
Red Hat	Red Hat Enterprise Linux 7 Extended Lifecycle Support	Unaffected: 0:3.10.0-1160.155.1.rt56.1307.el7 , < * (rpm) cpe:/a:redhat:rhel_extras_rt_els:7
Red Hat	Red Hat Enterprise Linux 7 Extended Lifecycle Support	Unaffected: 0:3.10.0-1160.155.1.el7 , < * (rpm) cpe:/o:redhat:rhel_els:7
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:4.18.0-553.132.1.rt7.473.el8_10 , < * (rpm) cpe:/a:redhat:enterprise_linux:8::nfv
Red Hat	Red Hat Enterprise Linux 8	Unaffected: 0:4.18.0-553.132.1.el8_10 , < * (rpm) cpe:/o:redhat:enterprise_linux:8
Red Hat	Red Hat Enterprise Linux 8.4 Advanced Mission Critical Update Support	Unaffected: 0:4.18.0-305.197.1.el8_4 , < * (rpm) cpe:/o:redhat:rhel_aus:8.4
Red Hat	Red Hat Enterprise Linux 8.4 Extended Update Support Long-Life Add-On	Unaffected: 0:4.18.0-305.197.1.el8_4 , < * (rpm) cpe:/o:redhat:rhel_eus_long_life:8.4
Red Hat	Red Hat Enterprise Linux 8.6 Advanced Mission Critical Update Support	Unaffected: 0:4.18.0-372.199.1.el8_6 , < * (rpm) cpe:/o:redhat:rhel_aus:8.6
Red Hat	Red Hat Enterprise Linux 8.6 Extended Update Support Long-Life Add-On	Unaffected: 0:4.18.0-372.199.1.el8_6 , < * (rpm) cpe:/o:redhat:rhel_eus_long_life:8.6
Red Hat	Red Hat Enterprise Linux 8.8 Telecommunications Update Service	Unaffected: 0:4.18.0-477.150.1.el8_8 , < * (rpm) cpe:/o:redhat:rhel_tus:8.8
Red Hat	Red Hat Enterprise Linux 8.8 Update Services for SAP Solutions	Unaffected: 0:4.18.0-477.150.1.el8_8 , < * (rpm) cpe:/o:redhat:rhel_e4s:8.8
Red Hat	Red Hat Enterprise Linux 9	Unaffected: 0:5.14.0-687.15.1.el9_8 , < * (rpm) cpe:/a:redhat:enterprise_linux:9 cpe:/o:redhat:enterprise_linux:9
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	Unaffected: 0:5.14.0-284.178.1.el9_2 , < * (rpm) cpe:/a:redhat:rhel_e4s:9.2
Red Hat	Red Hat Enterprise Linux 9.2 Update Services for SAP Solutions	Unaffected: 0:5.14.0-284.178.1.rt14.463.el9_2 , < * (rpm) cpe:/a:redhat:rhel_e4s:9.2::nfv
Red Hat	Red Hat Enterprise Linux 9.4 Update Services for SAP Solutions	Unaffected: 0:5.14.0-427.135.1.el9_4 , < * (rpm) cpe:/a:redhat:rhel_e4s:9.4
Red Hat	Red Hat Enterprise Linux 9.6 Extended Update Support	Unaffected: 0:5.14.0-570.125.1.el9_6 , < * (rpm) cpe:/a:redhat:rhel_eus:9.6
Red Hat	Red Hat Enterprise Linux 10	cpe:/o:redhat:enterprise_linux:10
Red Hat	Red Hat Enterprise Linux 6	cpe:/o:redhat:enterprise_linux:6
Red Hat	Red Hat Enterprise Linux 9	cpe:/o:redhat:enterprise_linux:9

Show details on NVD website

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To clipboard

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            "lang": "en",
            "value": "RHSA-2026:33900: Red Hat Enterprise Linux Real Time E4S (v.9.2), Red Hat Enterprise Linux Real Time for NFV E4S (v.9.2)"
          }
        ],
        "timeline": [
          {
            "lang": "en",
            "time": "2026-05-28T00:00:00.000Z",
            "value": "Reported to Red Hat."
          },
          {
            "lang": "en",
            "time": "2026-05-28T00:00:00.000Z",
            "value": "Made public."
          }
        ],
        "title": "kernel: RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()",
        "x_adpType": "supplier",
        "x_generator": {
          "engine": "sadp-cli 1.0.0"
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    ],
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/mellanox/mlx4/srq.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "1e2a44875b6afb4add1115f7f3351dcbeb6f273d",
              "status": "affected",
              "version": "30353bfc43a1602c020f31d95cf27182ffd23824",
              "versionType": "git"
            },
            {
              "lessThan": "8b7833f3bce35cb0d01c1503781523c099c675f0",
              "status": "affected",
              "version": "30353bfc43a1602c020f31d95cf27182ffd23824",
              "versionType": "git"
            },
            {
              "lessThan": "c9341307ea16b9395c2e4c9c94d8499d91fe31d0",
              "status": "affected",
              "version": "30353bfc43a1602c020f31d95cf27182ffd23824",
              "versionType": "git"
            }
          ]
        },
        {
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          "product": "Linux",
          "programFiles": [
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          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.9"
            },
            {
              "lessThan": "4.9",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "6.18.30",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.0.*",
              "status": "unaffected",
              "version": "7.0.7",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.1",
              "versionType": "original_commit_for_fix"
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        }
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          "nodes": [
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              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.30",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.0.7",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.1",
                  "versionStartIncluding": "4.9",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()\n\nSashiko points out the radix_tree itself is RCU safe, but nothing ever\nfrees the mlx4_srq struct with RCU, and it isn\u0027t even accessed within the\nRCU critical section. It also will crash if an event is delivered before\nthe srq object is finished initializing.\n\nUse the spinlock since it isn\u0027t easy to make RCU work, use\nrefcount_inc_not_zero() to protect against partially initialized objects,\nand order the refcount_set() to be after the srq is fully initialized."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The race\u0027s controllable side (SRQ create/destroy) is driven by local user space through the RDMA verbs interface (/dev/infiniband/uverbsN); a purely remote RDMA peer can generate events but cannot control SRQ lifecycle on the target, so exploitation requires local device access.\nAC:L - The attacker drives both sides \u2014 repeatedly creating/arming/destroying SRQs while keeping them at their limit watermark to make events fire \u2014 so the UAF/partial-init race is winnable through repetition rather than depending on conditions outside the attacker\u0027s control.\nPR:L - Creating/destroying SRQs requires access to the RDMA device node but not root or CAP_SYS_ADMIN; unprivileged users routinely have such access under the user-space RDMA model, so low privileges suffice.\nUI:N - The attacker performs all SRQ allocation, arming, and teardown themselves; no action by another user is required.\nS:U - The use-after-free and any resulting corruption stay within the kernel\u0027s own security authority; no VM/IOMMU/sandbox boundary is crossed.\nC:H - A use-after-free lets the attacker reallocate the freed mlx4_srq with controlled contents that are then read (refcount, srq-\u003eevent pointer), enabling kernel memory disclosure.\nI:H - The handler performs refcount manipulation and an indirect call through srq-\u003eevent on freed/reallocated memory, giving a control-flow-hijack / arbitrary-write primitive typical of UAF.\nA:H - Triggering the bug reliably causes a kernel crash \u2014 NULL/garbage function-pointer dereference for the partially-initialized case and oops/panic for the use-after-free."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-05T12:30:17.561Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/1e2a44875b6afb4add1115f7f3351dcbeb6f273d"
        },
        {
          "url": "https://git.kernel.org/stable/c/8b7833f3bce35cb0d01c1503781523c099c675f0"
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        {
          "url": "https://git.kernel.org/stable/c/c9341307ea16b9395c2e4c9c94d8499d91fe31d0"
        }
      ],
      "title": "RDMA/mlx4: Fix mis-use of RCU in mlx4_srq_event()",
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        "engine": "bippy-1.2.0"
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  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-46181",
    "datePublished": "2026-05-28T09:36:34.706Z",
    "dateReserved": "2026-05-13T15:03:33.103Z",
    "dateUpdated": "2026-09-15T12:04:28.058Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}

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.

Vulnerability timeline

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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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