CVE-2026-74378 (GCVE-0-2026-74378)
Vulnerability from cvelistv5
Published
2026-08-15 05:58
Modified
2026-10-16 18:55
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/rxe: Fix TOCTOU heap overflow in get_srq_wqe get_srq_wqe() reads wqe->dma.num_sge from the shared receive queue buffer, which is mapped into userspace. It validates num_sge against max_sge, but then re-reads the same field to calculate the memcpy size. A concurrent userspace thread can modify num_sge between validation and use, causing a heap buffer overflow when copying the WQE into qp->resp.srq_wqe. Read num_sge into a local variable and use it for both the bounds check and the size calculation.
References
Impacted products
Vendor Product Version
Linux Linux Version: 8700e3e7c4857d28ebaa824509934556da0b3e76
Version: 8700e3e7c4857d28ebaa824509934556da0b3e76
Version: 8700e3e7c4857d28ebaa824509934556da0b3e76
Version: 8700e3e7c4857d28ebaa824509934556da0b3e76
Version: 8700e3e7c4857d28ebaa824509934556da0b3e76
Version: 8700e3e7c4857d28ebaa824509934556da0b3e76
Version: 8700e3e7c4857d28ebaa824509934556da0b3e76
Version: 8700e3e7c4857d28ebaa824509934556da0b3e76
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  }
}


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Tags
Taxonomy of the tags.




Sightings

Author Source Type Date

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or seen somewhere by the user.
  • Confirmed: The vulnerability is confirmed from an analyst perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: This vulnerability was exploited and seen by the user reporting the sighting.
  • Patched: This vulnerability was successfully patched by the user reporting the sighting.
  • Not exploited: This vulnerability was not exploited or seen by the user reporting the sighting.
  • Not confirmed: The user expresses doubt about the veracity of the vulnerability.
  • Not patched: This vulnerability was not successfully patched by the user reporting the sighting.