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CVE-2026-90435

HIGHCVSS 7.8/10

Last modified

CVE-2026-90435 is a high-severity vulnerability rated 7.8/10 on the CVSS scale. 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..

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.

Metrics

CVSS 3.1
7.8/10

CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

Affected Software

Source: CNA advisory (CVE.org). NVD analysis pending.

VendorProductVersions
LinuxLinux>= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c, < ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20; >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c, < d99622e40aaa910ade681dfd4dc0fa240a011331; >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c, < c845e5e05140ea1bc64a5b1107942d93c876034d; >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c, < 42fb8aefffff5b458aaa66803364a16e0ea44129; >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c, < d7fa2ff72ad1861eac194a4e0075d504ba8c246e; >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c, < 5b6cfc6d7ff0959dd9766fdc24286a253b59ca77; >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c, < f917707f0de0832b8ab582391b1f64e549995c6c; >= e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c, < dec47e4b0fe34afdf38caa72b4408ba95502e5de
LinuxLinux3.11

References

Timeline

Published
Last Modified
Status
Received

Frequently Asked Questions

What is CVE-2026-90435?
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.
How severe is CVE-2026-90435?
CVE-2026-90435 has a CVSS score of 7.8/10 (HIGH severity).
How do I fix CVE-2026-90435?
Check the vendor references and advisories linked above for patched versions and mitigation guidance. You can also run a Strix scan to test if your systems are affected.

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Source: NVD / NIST