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CVE-2026-90435— RDMA/mlx5: Fix integer overflow of user QP buffer size

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.

在 Linux 内核中，以下漏洞已得到修复： RDMA/mlx5：修复用户 QP 缓冲区大小的整数溢出问题 函数通过将有符号整数形式的用户提供的 和 值进行左移运算来计算 QP 缓冲区大小。 当 的值足够大时，会引发有符号整数溢出，而这种情况属于未定义行为（undefined behavior），可能导致计算出的 值过小甚至为负数。其结果是， 会映射一个比硬件实际写入数据更小的缓冲区，从而引发潜在的安全或稳定性问题。 修复方法： 用 和 替换原有的移位和加法操作，从而拒绝无效的用户输入，防止整数溢出。 此外，在到达

CVSS 7.8 · High EPSS 0.18% · P7

Possible ATT&CK Techniques 1 AI

T1190 · Exploit Public-Facing Application

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c< ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20 affected
e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c< d99622e40aaa910ade681dfd4dc0fa240a011331 affected
e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c< c845e5e05140ea1bc64a5b1107942d93c876034d affected
e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c< 42fb8aefffff5b458aaa66803364a16e0ea44129 affected
e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c< d7fa2ff72ad1861eac194a4e0075d504ba8c246e affected
e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c< 5b6cfc6d7ff0959dd9766fdc24286a253b59ca77 affected
e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c< f917707f0de0832b8ab582391b1f64e549995c6c affected
e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c< dec47e4b0fe34afdf38caa72b4408ba95502e5de affected
… +10 more rows
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I. Basic Information for CVE-2026-90435

Vulnerability Information
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Vulnerability Title
RDMA/mlx5: Fix integer overflow of user QP buffer size
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: RDMA/mlx5: Fix integer overflow of user QP buffer size set_user_buf_size() computes the QP buffer size by left-shifting the user-supplied rq.wqe_cnt and rq.wqe_shift values as signed integers. A sufficiently large rq.wqe_cnt causes signed integer overflow, which is undefined behavior, and yields a small or negative buf_size, causing ib_umem_get() to map a buffer smaller than the hardware will actually write into. Replace the shifts and addition with check_shl_overflow() and check_add_overflow(), rejecting invalid user inputs. Moreover, guard the identical shift computing qp->sq.offset in _create_user_qp() before set_user_buf_size() is reached.
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

Affected Products

Vendor Product Affected Versions CPE Subscribe
Linux Linux e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c ~ ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20 -
Linux Linux 3.11 -

II. Public POCs for CVE-2026-90435

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III. Intelligence Information for CVE-2026-90435

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Patches & Fixes for CVE-2026-90435 (8)

Same Patch Batch · Linux · 2026-09-17 · 600 CVEs total

CVE-2026-92489 9.8 CRITICAL xfrm: Fix skb double-free in xfrm_dev_direct_output()
CVE-2026-90173 9.8 CRITICAL smb: smbdirect: free completion queues with ib_free_cq()
CVE-2026-90235 9.8 CRITICAL sunrpc: xprtsock: annotate shared socket callbacks with READ_ONCE/WRITE_ONCE
CVE-2026-90104 9.8 CRITICAL NFSv4.1: zero referring call lists before decoding
CVE-2026-90151 9.8 CRITICAL NFSv4: remove callback IDR entry on client allocation failure
CVE-2026-90110 9.4 CRITICAL inetpeer: randomize RB-tree node comparison using SipHash
CVE-2026-90414 9.1 CRITICAL IB/isert: reject PDUs declaring more data than was received
CVE-2026-90230 9.1 CRITICAL nvmet: fix heap out-of-bounds read in nvmet_auth_negotiate()
CVE-2026-90413 9.1 CRITICAL IB/isert: reject login PDUs declaring more data than was received
CVE-2026-90255 8.8 HIGH Bluetooth: hci_conn: fix the SCO setup context lifetime
CVE-2026-90329 8.8 HIGH HID: synchronize input before cleaning up a failed probe
CVE-2026-93189 8.8 HIGH HID: core: quiesce input in hid_hw_stop() to prevent use-after-free
CVE-2026-90286 8.8 HIGH drm/amdgpu/gfx6: Use PFP on the compute queues too
CVE-2026-90240 8.8 HIGH iommu/vt-d: Flush context cache with correct SID when tearing down aliases
CVE-2026-90357 8.8 HIGH wifi: mt76: mt7915: unlink TWT flow if the MCU rejects the agreement
CVE-2026-90367 8.8 HIGH wifi: mt76: mt7996: hold dev->mt76.mutex while disabling tx worker in SER
CVE-2026-90380 8.8 HIGH wifi: mt76: mt792x: fix use-after-free in mt76_rx_poll_complete
CVE-2026-90379 8.8 HIGH wifi: mt76: mt7921: Add PCIe AER handler support to prevent system crash
CVE-2026-90256 8.8 HIGH Bluetooth: L2CAP: use proto_lock for l2cap_data to fix l2cap_disconn_ind
CVE-2026-90371 8.8 HIGH wifi: mt76: fix RXDMAD_C buffer recycling race

Showing top 20 of 600 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2026-90435

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