Vulnerability-Lookup

FKIE_CVE-2026-90309

Vulnerability from fkie_nvd - Published: 2026-09-17 17:17 - Updated: 2026-09-18 18:17

Severity

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

Summary

In the Linux kernel, the following vulnerability has been resolved: RDMA/erdma: Hold CQ references when processing EQ events EQ handlers look up CQs from dev->cq_xa and invoke CQ completion or error callbacks outside the xarray lock. erdma_destroy_cq() can erase the CQ from the xarray and free its queue buffer and doorbell record while a previously scheduled EQ handler is still using the CQ. Add a CQ refcount and take a reference under the xarray lock with refcount_inc_not_zero(). Remove the CQ from the xarray before dropping the destroy-path reference, then wait for in-flight EQ users before releasing CQ resources.

References

	URL	Tags
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/05b8ca493dd02319bca93c640b259c2ba51ef321
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/1fc9c1933959d2776a1ce7bf424251b8b5b586cd
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4545f355654d044d35a31cd01cc46f491a8a7c36
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/610ef81797bb4f709e8675c1d8d093bb9ccdcbd8
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/98df2aee1459ee1c62c70cbe9b370d2a532aea36
	416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/c0a83f29a24c7e7f8516630848ef6db4c174deed

Impacted products

	Vendor	Product	Version

JSON

To clipboard

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/erdma/erdma_eq.c",
            "drivers/infiniband/hw/erdma/erdma_verbs.c",
            "drivers/infiniband/hw/erdma/erdma_verbs.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "610ef81797bb4f709e8675c1d8d093bb9ccdcbd8",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            },
            {
              "lessThan": "c0a83f29a24c7e7f8516630848ef6db4c174deed",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            },
            {
              "lessThan": "05b8ca493dd02319bca93c640b259c2ba51ef321",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            },
            {
              "lessThan": "1fc9c1933959d2776a1ce7bf424251b8b5b586cd",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            },
            {
              "lessThan": "4545f355654d044d35a31cd01cc46f491a8a7c36",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            },
            {
              "lessThan": "98df2aee1459ee1c62c70cbe9b370d2a532aea36",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/erdma/erdma_eq.c",
            "drivers/infiniband/hw/erdma/erdma_verbs.c",
            "drivers/infiniband/hw/erdma/erdma_verbs.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
            },
            {
              "lessThan": "6.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "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\nRDMA/erdma: Hold CQ references when processing EQ events\n\nEQ handlers look up CQs from dev-\u003ecq_xa and invoke CQ completion or\nerror callbacks outside the xarray lock. erdma_destroy_cq() can erase the\nCQ from the xarray and free its queue buffer and doorbell record while a\npreviously scheduled EQ handler is still using the CQ.\n\nAdd a CQ refcount and take a reference under the xarray lock with\nrefcount_inc_not_zero(). Remove the CQ from the xarray before dropping\nthe destroy-path reference, then wait for in-flight EQ users before\nreleasing CQ resources."
    }
  ],
  "id": "CVE-2026-90309",
  "lastModified": "2026-09-18T18:17:52.977",
  "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"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9,
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary"
      }
    ]
  },
  "published": "2026-09-17T17:17:28.637",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/05b8ca493dd02319bca93c640b259c2ba51ef321"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/1fc9c1933959d2776a1ce7bf424251b8b5b586cd"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/4545f355654d044d35a31cd01cc46f491a8a7c36"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/610ef81797bb4f709e8675c1d8d093bb9ccdcbd8"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/98df2aee1459ee1c62c70cbe9b370d2a532aea36"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/c0a83f29a24c7e7f8516630848ef6db4c174deed"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Received"
}

CVE-2026-90309 (GCVE-0-2026-90309)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:08 – Updated: 2026-09-18 17:54

Title

RDMA/erdma: Hold CQ references when processing EQ events

Summary

Severity

7.8 (High)


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

Assigner

Linux mitre root

References

6 references

URL	Tags
https://git.kernel.org/stable/c/610ef81797bb4f709…
https://git.kernel.org/stable/c/c0a83f29a24c7e7f8…
https://git.kernel.org/stable/c/05b8ca493dd02319b…
https://git.kernel.org/stable/c/1fc9c1933959d2776…
https://git.kernel.org/stable/c/4545f355654d044d3…
https://git.kernel.org/stable/c/98df2aee1459ee1c6…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 155055771704f8cbb5c176a4309b7dc30a50450c , < 610ef81797bb4f709e8675c1d8d093bb9ccdcbd8 (git) Affected: 155055771704f8cbb5c176a4309b7dc30a50450c , < c0a83f29a24c7e7f8516630848ef6db4c174deed (git) Affected: 155055771704f8cbb5c176a4309b7dc30a50450c , < 05b8ca493dd02319bca93c640b259c2ba51ef321 (git) Affected: 155055771704f8cbb5c176a4309b7dc30a50450c , < 1fc9c1933959d2776a1ce7bf424251b8b5b586cd (git) Affected: 155055771704f8cbb5c176a4309b7dc30a50450c , < 4545f355654d044d35a31cd01cc46f491a8a7c36 (git) Affected: 155055771704f8cbb5c176a4309b7dc30a50450c , < 98df2aee1459ee1c62c70cbe9b370d2a532aea36 (git)
Linux	Linux	Affected: 6.0 Unaffected: 0 , < 6.0 (semver) Unaffected: 6.1.188 , ≤ 6.1.* (semver) Unaffected: 6.6.157 , ≤ 6.6.* (semver) Unaffected: 6.12.110 , ≤ 6.12.* (semver) Unaffected: 6.18.52 , ≤ 6.18.* (semver) Unaffected: 7.2.6 , ≤ 7.2.* (semver) Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/erdma/erdma_eq.c",
            "drivers/infiniband/hw/erdma/erdma_verbs.c",
            "drivers/infiniband/hw/erdma/erdma_verbs.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "610ef81797bb4f709e8675c1d8d093bb9ccdcbd8",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            },
            {
              "lessThan": "c0a83f29a24c7e7f8516630848ef6db4c174deed",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            },
            {
              "lessThan": "05b8ca493dd02319bca93c640b259c2ba51ef321",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            },
            {
              "lessThan": "1fc9c1933959d2776a1ce7bf424251b8b5b586cd",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            },
            {
              "lessThan": "4545f355654d044d35a31cd01cc46f491a8a7c36",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            },
            {
              "lessThan": "98df2aee1459ee1c62c70cbe9b370d2a532aea36",
              "status": "affected",
              "version": "155055771704f8cbb5c176a4309b7dc30a50450c",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/erdma/erdma_eq.c",
            "drivers/infiniband/hw/erdma/erdma_verbs.c",
            "drivers/infiniband/hw/erdma/erdma_verbs.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.0"
            },
            {
              "lessThan": "6.0",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.188",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.157",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.110",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.52",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.6",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.1.188",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.6.157",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.110",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.52",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.6",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "6.0",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/erdma: Hold CQ references when processing EQ events\n\nEQ handlers look up CQs from dev-\u003ecq_xa and invoke CQ completion or\nerror callbacks outside the xarray lock. erdma_destroy_cq() can erase the\nCQ from the xarray and free its queue buffer and doorbell record while a\npreviously scheduled EQ handler is still using the CQ.\n\nAdd a CQ refcount and take a reference under the xarray lock with\nrefcount_inc_not_zero(). Remove the CQ from the xarray before dropping\nthe destroy-path reference, then wait for in-flight EQ users before\nreleasing CQ resources."
        }
      ],
      "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 UAF is reached by IB_USER_VERBS_CMD_DESTROY_CQ/UVERBS_METHOD_CQ_DESTROY on /dev/infiniband/uverbsN racing erdma_ceq_completion_handler and erdma_aeq_event_handler; CEQE/AEQE CQNs are written by the ERDMA NIC for locally created CQs, not parsed from a remote RoCE/iWARP message.\nAC:L - The attacker drives both sides: userspace SQ/RQ doorbells via erdma_mmap (or ib_uverbs_post_send) make the NIC post CEQEs and schedule the CEQ tasklet, while another thread runs ib_uverbs_destroy_cq; pre-fix erdma_destroy_cq xa_erase\u0027d the CQ with no ref wait, so the race is attacker-controlled.\nPR:L - ib_uverbs_open allows CQ create/destroy with no capability check; uverbs_devnode sets /dev/infiniband/uverbsN to mode 0666, and erdma_alloc_ucontext/erdma_create_cq/erdma_destroy_cq do not require CAP_NET_ADMIN or init-namespace root.\nUI:N - The attacker creates the CQ via ib_uverbs_create_cq, generates EQ events from their own QPs, and tears it down via ib_uverbs_destroy_cq/uverbs_free_cq on that uverbs fd; no other user must mount, open a file, or otherwise act.\nS:U - The dangling erdma_cq is used inside the same host kernel that issued the uverbs destroy (comp_handler/event_handler on ibcq); this is in-kernel privilege escalation, not a KVM/Xen guest-to-host or IOMMU/DMA boundary bypass.\nC:H - After ib_destroy_cq_user kfree(cq), erdma_ceq_completion_handler still reads cq-\u003eibcq.comp_handler and cq-\u003eibcq.cq_context from the freed object, and ib_uverbs_comp_handler then follows cq-\u003euobject, giving a UAF read of kernel heap.\nI:H - The same dangling pointer is used to invoke cq-\u003eibcq.comp_handler (and on AEQ CQ_ERR, cq-\u003eibcq.event_handler); kernel CQs also do cq-\u003ekern_cq.cmdsn++. Calling a function pointer from a freed erdma_cq is an arbitrary-write/control-flow hijack primitive.\nA:H - erdma_ceq_completion_handler or erdma_aeq_event_handler dereferencing the kfree\u0027d erdma_cq (junk comp_handler/uobject) oopses the kernel, and repeating create_cq/destroy_cq while CEQ/AEQ events are in flight panics the host."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-18T17:54:28.510Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/610ef81797bb4f709e8675c1d8d093bb9ccdcbd8"
        },
        {
          "url": "https://git.kernel.org/stable/c/c0a83f29a24c7e7f8516630848ef6db4c174deed"
        },
        {
          "url": "https://git.kernel.org/stable/c/05b8ca493dd02319bca93c640b259c2ba51ef321"
        },
        {
          "url": "https://git.kernel.org/stable/c/1fc9c1933959d2776a1ce7bf424251b8b5b586cd"
        },
        {
          "url": "https://git.kernel.org/stable/c/4545f355654d044d35a31cd01cc46f491a8a7c36"
        },
        {
          "url": "https://git.kernel.org/stable/c/98df2aee1459ee1c62c70cbe9b370d2a532aea36"
        }
      ],
      "title": "RDMA/erdma: Hold CQ references when processing EQ events",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-90309",
    "datePublished": "2026-09-17T16:08:30.346Z",
    "dateReserved": "2026-09-11T19:38:34.800Z",
    "dateUpdated": "2026-09-18T17:54:28.510Z",
    "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.

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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FKIE_CVE-2026-90309

CVE-2026-90309 (GCVE-0-2026-90309)

Tags

Sightings

Nomenclature

Related by attack behaviour