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CVE-2026-74377— RDMA/rxe: Copy WQE to local buffer in non-SRQ receive path

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，该漏洞源于非SRQ接收路径中WQE字段直接从映射到用户空间的共享队列缓冲区读取，允许恶意用户修改num_sge或sge条目，导致在rxe_resp_check_length()和copy_data()中出现越界读取。

CVSS 7.8 · High EPSS 0.13% · P3

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 14

VendorProduct Version RangeStatus
Linux Linux 8700e3e7c4857d28ebaa824509934556da0b3e76< 2e60378fb3c8b51c94103bb40014c4fe38fa5033 affected
8700e3e7c4857d28ebaa824509934556da0b3e76< fc72fd61cc8b2e2e3e92ae4c0e9cc30c9a7ecb78 affected
8700e3e7c4857d28ebaa824509934556da0b3e76< 9fa785137303f7109c23dea779b8dedc67c9b531 affected
8700e3e7c4857d28ebaa824509934556da0b3e76< 5420eebf3b3c162bfaf965f30e61cd1d689e5732 affected
8700e3e7c4857d28ebaa824509934556da0b3e76< a211b7904aed365e4e4f08a48ec6e6dd1ea7b16b affected
8700e3e7c4857d28ebaa824509934556da0b3e76< d6ab440240a04b8737ee4c7bb21af9182e451733 affected
4.8 affected
< 4.8 unaffected
… +6 more rows
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I. Basic Information for CVE-2026-74377

Vulnerability Information
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Vulnerability Title
RDMA/rxe: Copy WQE to local buffer in non-SRQ receive path
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/rxe: Copy WQE to local buffer in non-SRQ receive path For non-SRQ QPs, the responder reads WQE fields directly from the shared queue buffer mapped into userspace. This allows a malicious user to modify fields like num_sge or sge entries while the kernel is processing the WQE, leading to out-of-bounds reads in rxe_resp_check_length() and copy_data(). Introduce get_recv_wqe() that validates num_sge and copies the WQE to a kernel-local buffer before processing, matching the approach already used for SRQ WQEs in get_srq_wqe(). The srq_wqe buffer is reused since SRQ and non-SRQ paths are mutually exclusive per QP.
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，该漏洞源于非SRQ接收路径中WQE字段直接从映射到用户空间的共享队列缓冲区读取，允许恶意用户修改num_sge或sge条目，导致在rxe_resp_check_length()和copy_data()中出现越界读取。
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 ~ 2e60378fb3c8b51c94103bb40014c4fe38fa5033 -
Linux Linux 4.8 -

II. Public POCs for CVE-2026-74377

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III. Intelligence Information for CVE-2026-74377

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Patches & Fixes for CVE-2026-74377 (5)

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

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