Vulnerability details
CVE-2026-74378
Linux Linux
RDMA/rxe: Fix TOCTOU heap overflow in get_srq_wqe
CVSS 3.1
7.8High
Official description
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.
CVSS scores
| Score | Version | Source | Vector |
|---|---|---|---|
| 7.8High | 3.1 | CVEProject cvelistV5 (CNA) (Linux) | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H |
Affected products
| Vendor | Product | Versions | Source |
|---|---|---|---|
| Linux | Linux | 4.8 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8700e3e7c4857d28ebaa824509934556da0b3e76 ≤ v < e48daa94ad2d406225b73491fc935064716f0ec7 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8700e3e7c4857d28ebaa824509934556da0b3e76 ≤ v < 3cfa2a3adc51b7c57729961a03446962ff10e3d2 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8700e3e7c4857d28ebaa824509934556da0b3e76 ≤ v < cd19a6345e3727adafafa5954b58b13c92e13b80 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8700e3e7c4857d28ebaa824509934556da0b3e76 ≤ v < c8db0e5ab0b6c540214c46c56aaac7cbcb0967fe | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8700e3e7c4857d28ebaa824509934556da0b3e76 ≤ v < 02558c86b6b761063e9399e6b939984500327ef1 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8700e3e7c4857d28ebaa824509934556da0b3e76 ≤ v < b9800d7953d119bcc068c74587d48e4ba0313629 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8700e3e7c4857d28ebaa824509934556da0b3e76 ≤ v < 22b8fbded65b8c441b634a185f8da67657df6c50 | CVEProject cvelistV5 (CNA) |
| Linux | Linux | 8700e3e7c4857d28ebaa824509934556da0b3e76 ≤ v < 3e07ea9579dc9553d2285c26c2823931358aa3b8 | CVEProject cvelistV5 (CNA) |
References and advisories
8- https://git.kernel.org/stable/c/c8db0e5ab0b6c540214c46c56aaac7cbcb0967fe
- https://git.kernel.org/stable/c/e48daa94ad2d406225b73491fc935064716f0ec7
- https://git.kernel.org/stable/c/3cfa2a3adc51b7c57729961a03446962ff10e3d2
- https://git.kernel.org/stable/c/cd19a6345e3727adafafa5954b58b13c92e13b80
- https://git.kernel.org/stable/c/3e07ea9579dc9553d2285c26c2823931358aa3b8
- https://git.kernel.org/stable/c/02558c86b6b761063e9399e6b939984500327ef1
- https://git.kernel.org/stable/c/b9800d7953d119bcc068c74587d48e4ba0313629
- https://git.kernel.org/stable/c/22b8fbded65b8c441b634a185f8da67657df6c50
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Details
- Published
- 2026-08-15
- Last updated
- 2026-10-16
- State
- Published
- Assigner (CNA)
- Linux
Exploit prediction (EPSS)
0.14%
Probability of exploitation in 30 days
3.6%
Percentile (among all CVEs)
SSVC assessment (CISA)
- Automatable
- No
- Exploitation
- None
- Technical impact
- Total
Weaknesses (CWE)
- —