RDMA/mlx5: Fix integer overflow of user QP buffer size

MITRE NVD CVE.ORG JSON API

Summary

CVECVE-2026-90435
StatePUBLISHED
AssignerLinux
Source PriorityCVE Program / NVD first with legacy fallback
Published2026-09-17 17:17:48 UTC
Updated2026-09-18 18:17:59 UTC
DescriptionIn 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.

Risk And Classification

Primary CVSS: v3.1 7.8 HIGH from 416baaa9-dc9f-4396-8d5f-8c081fb06d67

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

EPSS: 0.001290000 probability, percentile 0.029060000 (date 2026-09-21)

VersionSourceTypeScoreSeverityVector
3.1416baaa9-dc9f-4396-8d5f-8c081fb06d67Secondary7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
3.1CNADECLARED7.8HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H

CVSS v3.1 Breakdown

Attack Vector
Local
Attack Complexity
Low
Privileges Required
Low
User Interaction
None
Scope
Unchanged
Confidentiality
High
Integrity
High
Availability
High

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

Vendor Declared Affected Products

SourceVendorProductVersionPlatforms
CNA Linux Linux affected e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20 git Not specified
CNA Linux Linux affected e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c d99622e40aaa910ade681dfd4dc0fa240a011331 git Not specified
CNA Linux Linux affected e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c c845e5e05140ea1bc64a5b1107942d93c876034d git Not specified
CNA Linux Linux affected e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c 42fb8aefffff5b458aaa66803364a16e0ea44129 git Not specified
CNA Linux Linux affected e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c d7fa2ff72ad1861eac194a4e0075d504ba8c246e git Not specified
CNA Linux Linux affected e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c 5b6cfc6d7ff0959dd9766fdc24286a253b59ca77 git Not specified
CNA Linux Linux affected e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c f917707f0de0832b8ab582391b1f64e549995c6c git Not specified
CNA Linux Linux affected e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c dec47e4b0fe34afdf38caa72b4408ba95502e5de git Not specified
CNA Linux Linux affected 3.11 Not specified
CNA Linux Linux unaffected 3.11 semver Not specified
CNA Linux Linux unaffected 5.10.270 5.10.* semver Not specified
CNA Linux Linux unaffected 5.15.221 5.15.* semver Not specified
CNA Linux Linux unaffected 6.1.188 6.1.* semver Not specified
CNA Linux Linux unaffected 6.6.157 6.6.* semver Not specified
CNA Linux Linux unaffected 6.12.110 6.12.* semver Not specified
CNA Linux Linux unaffected 6.18.52 6.18.* semver Not specified
CNA Linux Linux unaffected 7.2.6 7.2.* semver Not specified
CNA Linux Linux unaffected 7.3-rc1 * original_commit_for_fix Not specified

References

ReferenceSourceLinkTags
git.kernel.org/stable/c/dec47e4b0fe34afdf38caa72b4408ba95502e5de 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/5b6cfc6d7ff0959dd9766fdc24286a253b59ca77 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/42fb8aefffff5b458aaa66803364a16e0ea44129 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d99622e40aaa910ade681dfd4dc0fa240a011331 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/c845e5e05140ea1bc64a5b1107942d93c876034d 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/d7fa2ff72ad1861eac194a4e0075d504ba8c246e 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/f917707f0de0832b8ab582391b1f64e549995c6c 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
git.kernel.org/stable/c/ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20 416baaa9-dc9f-4396-8d5f-8c081fb06d67 git.kernel.org
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