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

Vulnerability from cvelistv5 – Published: 2026-08-15 05:59 – Updated: 2026-08-17 05:46
VLAI
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
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 146d2f1af3245a10b13eef263687e54f4e253d1d , < 2c3b2667dad69d56774b79db763acb3a1bee0fc0 (git)
Affected: 146d2f1af3245a10b13eef263687e54f4e253d1d , < 37fc3cc0f924fd8d0f0cf87b92672dec75a32e57 (git)
Affected: 146d2f1af3245a10b13eef263687e54f4e253d1d , < 65e344925fa30abf50c8de8c150b397715fa2066 (git)
Affected: 146d2f1af3245a10b13eef263687e54f4e253d1d , < f88e12c95fc19f719e06ca1e9eb20fdad68ef61a (git)
Affected: 146d2f1af3245a10b13eef263687e54f4e253d1d , < e79389115b9d27287ff6230a9750675106ed7668 (git)
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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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          "product": "Linux",
          "programFiles": [
            "drivers/infiniband/hw/mlx5/main.c"
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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)."
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    "redhat_vex": {
      "aggregate_severity": "Low",
      "current_release_date": "2026-08-20T22:20:07+00:00",
      "cve": "CVE-2026-74397",
      "id": "CVE-2026-74397",
      "initial_release_date": "2026-08-15T00:00:00+00:00",
      "product_status:known_affected": "274",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: IB/mlx5: Fix transport-domain rollback and initialize lb mutex earlier",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-74397.json",
      "version": "3"
    }
  }
}



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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

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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.