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CVE-2026-74378— RDMA/rxe: Fix TOCTOU heap overflow in get_srq_wqe

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 4.8版本存在安全漏洞，该漏洞源于get_srq_wqe函数在验证和使用wqe->dma.num_sge参数之间存在TOCTOU竞态条件，导致堆缓冲区溢出。

CVSS 7.8 · High EPSS 0.14% · P4

Possible ATT&CK Techniques 1 AI

T1203 · Exploitation for Client Execution

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 8700e3e7c4857d28ebaa824509934556da0b3e76< 3cfa2a3adc51b7c57729961a03446962ff10e3d2 affected
8700e3e7c4857d28ebaa824509934556da0b3e76< cd19a6345e3727adafafa5954b58b13c92e13b80 affected
8700e3e7c4857d28ebaa824509934556da0b3e76< 3e07ea9579dc9553d2285c26c2823931358aa3b8 affected
8700e3e7c4857d28ebaa824509934556da0b3e76< 02558c86b6b761063e9399e6b939984500327ef1 affected
8700e3e7c4857d28ebaa824509934556da0b3e76< b9800d7953d119bcc068c74587d48e4ba0313629 affected
8700e3e7c4857d28ebaa824509934556da0b3e76< 22b8fbded65b8c441b634a185f8da67657df6c50 affected
4.8 affected
< 4.8 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-74378

Vulnerability Information
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Vulnerability Title
RDMA/rxe: Fix TOCTOU heap overflow in get_srq_wqe
Source: CVE Program / CVE List V5
Vulnerability 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.
Source: CVE Program / CVE List V5
CVSS Information
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会开源的一个操作系统内核。 Linux kernel 4.8版本存在安全漏洞，该漏洞源于get_srq_wqe函数在验证和使用wqe->dma.num_sge参数之间存在TOCTOU竞态条件，导致堆缓冲区溢出。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux 8700e3e7c4857d28ebaa824509934556da0b3e76 ~ 3cfa2a3adc51b7c57729961a03446962ff10e3d2 -
Linux Linux 4.8 -

II. Public POCs for CVE-2026-74378

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III. Intelligence Information for CVE-2026-74378

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Patches & Fixes for CVE-2026-74378 (6)

Same Patch Batch · Linux · 2026-08-15 · 845 CVEs total

CVE-2026-74280 10.0 CRITICAL crypto: marvell/octeontx - fix DMA cleanup using wrong loop index
CVE-2026-74279 10.0 CRITICAL crypto: cavium/cpt - fix DMA cleanup using wrong loop index
CVE-2026-72421 10.0 CRITICAL ipv4: fib: Don't ignore error route in local/main tables.
CVE-2026-74475 10.0 CRITICAL vxlan: use neigh_ha_snapshot() in route_shortcircuit()
CVE-2026-72408 10.0 CRITICAL geneve: gate GRO hint in geneve_gro_complete() on gs->gro_hint
CVE-2026-72407 10.0 CRITICAL geneve: validate inner network offset in geneve_gro_complete()
CVE-2026-74309 10.0 CRITICAL vdpa/octeon_ep: fix IRQ-to-ring mapping in interrupt handler
CVE-2026-72493 9.9 CRITICAL net: serialize netif_running() check in enqueue_to_backlog()
CVE-2026-72211 9.8 CRITICAL ntfs: grow index root value before reparent header update
CVE-2026-74474 9.8 CRITICAL vxlan: use pskb_network_may_pull() for transmit path header pulls
CVE-2026-72209 9.8 CRITICAL ntfs: validate attribute values on lookup
CVE-2026-72208 9.8 CRITICAL ntfs: add bounds check before accessing EA entries
CVE-2026-72477 9.8 CRITICAL fs/ntfs3: call _ntfs_bad_inode() when failing to rename
CVE-2026-72299 9.8 CRITICAL tipc: restrict socket queue dumps in enqueue tracepoints
CVE-2026-74434 9.8 CRITICAL rxrpc: Don't move a peeked OOB message onto the pending queue
CVE-2026-74433 9.8 CRITICAL rxrpc: Fix UAF in rxgk_issue_challenge()
CVE-2026-72473 9.8 CRITICAL xprtrdma: Decouple req recycling from RPC completion
CVE-2026-72472 9.8 CRITICAL nfs: use nfsi->rwsem to protect traversal of the file lock list
CVE-2026-74545 9.8 CRITICAL rtase: fix double free of multi-frag skb on DMA map failure
CVE-2026-72201 9.8 CRITICAL ntfs: validate index entries on reading

Showing top 20 of 845 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-74378

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