Vulnerability-Lookup

GHSA-85RJ-HFQQ-77V3

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33

Details

In the Linux kernel, the following vulnerability has been resolved:

IB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier

mlx5_ib_alloc_transport_domain() allocates a transport domain and then may fail in mlx5_ib_enable_lb(). In that case, the allocated TD is leaked.

Fix this by deallocating the TD when mlx5_ib_enable_lb() returns an error. Also return 0 explicitly in the no-loopback-capability success branch, and move dev->lb.mutex initialization to mlx5_ib_stage_init_init().

Severity

7.8 (High)


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

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{
  "affected": [],
  "aliases": [
    "CVE-2026-74397"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:41Z",
    "severity": "HIGH"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nIB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier\n\nmlx5_ib_alloc_transport_domain() allocates a transport domain and then\nmay fail in mlx5_ib_enable_lb(). In that case, the allocated TD is leaked.\n\nFix this by deallocating the TD when mlx5_ib_enable_lb() returns an\nerror. Also return 0 explicitly in the no-loopback-capability success\nbranch, and move dev-\u003elb.mutex initialization to mlx5_ib_stage_init_init().",
  "id": "GHSA-85rj-hfqq-77v3",
  "modified": "2026-08-17T06:33:42Z",
  "published": "2026-08-15T06:32:32Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74397"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2c3b2667dad69d56774b79db763acb3a1bee0fc0"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/37fc3cc0f924fd8d0f0cf87b92672dec75a32e57"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/65e344925fa30abf50c8de8c150b397715fa2066"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/e79389115b9d27287ff6230a9750675106ed7668"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f88e12c95fc19f719e06ca1e9eb20fdad68ef61a"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}

CVE-2026-74397 (GCVE-0-2026-74397)

Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-17 05:46

Title

IB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier

Summary

In the Linux kernel, the following vulnerability has been resolved: IB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier mlx5_ib_alloc_transport_domain() allocates a transport domain and then may fail in mlx5_ib_enable_lb(). In that case, the allocated TD is leaked. Fix this by deallocating the TD when mlx5_ib_enable_lb() returns an error. Also return 0 explicitly in the no-loopback-capability success branch, and move dev->lb.mutex initialization to mlx5_ib_stage_init_init().

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

5 references

URL	Tags
https://git.kernel.org/stable/c/2c3b2667dad69d567…
https://git.kernel.org/stable/c/37fc3cc0f924fd8d0…
https://git.kernel.org/stable/c/65e344925fa30abf5…
https://git.kernel.org/stable/c/f88e12c95fc19f719…
https://git.kernel.org/stable/c/e79389115b9d27287…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: 146d2f1af3245a10b13eef263687e54f4e253d1d , < 2c3b2667dad69d56774b79db763acb3a1bee0fc0 (git) Affected: 146d2f1af3245a10b13eef263687e54f4e253d1d , < 37fc3cc0f924fd8d0f0cf87b92672dec75a32e57 (git) Affected: 146d2f1af3245a10b13eef263687e54f4e253d1d , < 65e344925fa30abf50c8de8c150b397715fa2066 (git) Affected: 146d2f1af3245a10b13eef263687e54f4e253d1d , < f88e12c95fc19f719e06ca1e9eb20fdad68ef61a (git) Affected: 146d2f1af3245a10b13eef263687e54f4e253d1d , < e79389115b9d27287ff6230a9750675106ed7668 (git)
Linux	Linux	Affected: 4.5 Unaffected: 0 , < 4.5 (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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{
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      "affected": [
        {
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          "programFiles": [
            "drivers/infiniband/hw/mlx5/main.c"
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              "versionType": "semver"
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              "versionType": "semver"
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              "status": "unaffected",
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              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
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              "versionType": "original_commit_for_fix"
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      "cpeApplicability": [
        {
          "nodes": [
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          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nIB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier\n\nmlx5_ib_alloc_transport_domain() allocates a transport domain and then\nmay fail in mlx5_ib_enable_lb(). In that case, the allocated TD is leaked.\n\nFix this by deallocating the TD when mlx5_ib_enable_lb() returns an\nerror. Also return 0 explicitly in the no-loopback-capability success\nbranch, and move dev-\u003elb.mutex initialization to mlx5_ib_stage_init_init()."
        }
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              "value": "AV:L - Reachable only via local ibverbs syscalls (ioctl/write) on /dev/infiniband/uverbsX through mlx5_ib_alloc_ucontext() and mlx5_ib_create_qp(); not via remote RoCE/IB packet handling.\nAC:L - An attacker can reliably open uverbs and create raw-packet QPs with self-loopback flags to invoke mlx5_ib_enable_lb(); TD leaks are repeatable by looping alloc_ucontext and can force enable_lb failure via memory pressure or firmware errors.\nPR:L - Kernel creates uverbs device nodes as world-accessible (0666); alloc_ucontext and create_qp require no real root/CAP_SYS_ADMIN, only local access to the mlx5 RDMA character device on hosts with the hardware.\nUI:N - Exploitation needs only attacker-driven ibverbs calls; no victim interaction such as mounting filesystems, clicking links, or opening files is required.\nS:U - Impact stays within the host kernel mlx5 RDMA driver scope; this is not a VM escape, IOMMU/DMA boundary bypass, or other cross-security-authority compromise per kernel CVSS guidance.\nC:H - Locking an uninitialized dev-\u003elb.mutex in mlx5_ib_enable_lb()/disable_lb is undefined behavior that can corrupt kernel memory and be leveraged for arbitrary kernel memory disclosure.\nI:H - Uninitialized mutex use during ucontext transport-domain setup or raw-packet QP creation can corrupt adjacent kernel structures and enable arbitrary write or control-flow hijack primitives.\nA:H - Invalid mutex operations can kernel panic/oops; repeated alloc_ucontext without TD rollback on mlx5_ib_enable_lb() failure exhausts transport domains and denies further RDMA context/QP creation (DoS)."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-08-17T05:46:42.049Z",
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        "shortName": "Linux"
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        },
        {
          "url": "https://git.kernel.org/stable/c/e79389115b9d27287ff6230a9750675106ed7668"
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      "title": "IB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier",
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}

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.

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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GHSA-85RJ-HFQQ-77V3

CVE-2026-74397 (GCVE-0-2026-74397)

Tags

Sightings

Nomenclature