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NVD / CVE Program· CNA Linux

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

Noroxi assessment

Priority: Monitor (action score 31/100)

  • The sources we track (CISA KEV, Exploit-DB, Metasploit, Nuclei, GitHub) show no public exploit code or exploitation in the wild.
  • Probability of exploitation in the next 30 days: 0.12% (FIRST EPSS).
  • Someone with local access to the system can trigger it. A low-privileged account is enough. No user action is required. No special conditions are required; it is repeatable.
  • Fixed version: Linux Linux 42fb8aefffff5b458aaa66803364a16e0ea44129, 5b6cfc6d7ff0959dd9766fdc24286a253b59ca77, c845e5e05140ea1bc64a5b1107942d93c876034d.

Low priority for now. Upgrade to Linux Linux 42fb8aefffff5b458aaa66803364a16e0ea44129, 5b6cfc6d7ff0959dd9766fdc24286a253b59ca77, c845e5e05140ea1bc64a5b1107942d93c876034d or later.

Generated automatically from the record's data: CVSS (NVD and CNA), CISA KEV and SSVC, FIRST EPSS, exploit sources, fixed versions. How we calculate it

Primary sources: NVD · CVE.org · FIRST EPSS

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.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Sep 17, 2026
Updated
Oct 19, 2026
EPSS
0.1% · 2th percentile
CWE
—

Report tools

JSON

Action score

31

Monitor

Low priority for now.

CVSS
31 / 40 · 7.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.1%

CNA vs NVD score

NVD
—
CNA · Linux
7.8
NVD has not scored this yet; the score shown is the CNA’s.

The score given by the assigning authority versus NVD’s independent score. A gap means the severity is contested.

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  • Not in KEV: no record of exploitation in the wild
  • No public exploit code on record
  • A fix has been released

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When you'll hear from us

  • when it enters CISA KEV
  • when exploit code appears or is weaponized
  • when the record is updated (including a fixed version)
  • when EPSS rises 20 points in a week

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Noroxi analysis

What does it mean in your environment?

The assessment above is generated automatically from the record's data; it doesn't know your environment. Our team verifies on your systems whether this vulnerability is actually exploitable and which mitigation is enough.

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Affected systems

Is your version affected?

Pick the product and type the version you run. It's compared with this record's version ranges in your browser; the version isn't sent anywhere.

—

Versions reported by the vendor

Affected version ranges reported by the assigning authority (Linux). Independent of NVD's CPE analysis and usually ahead of it.

  • Linux Linux

    • 3.11affected
    • e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c and later · before ccce6b7ef1d7efc59ccba3421e1339c6e63a3d20affected · git
    • e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c and later · before d99622e40aaa910ade681dfd4dc0fa240a011331affected · git
    • e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c and later · before c845e5e05140ea1bc64a5b1107942d93c876034daffected · git
    • e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c and later · before 42fb8aefffff5b458aaa66803364a16e0ea44129affected · git
    • e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c and later · before d7fa2ff72ad1861eac194a4e0075d504ba8c246eaffected · git
    • e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c and later · before 5b6cfc6d7ff0959dd9766fdc24286a253b59ca77affected · git
    • e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c and later · before f917707f0de0832b8ab582391b1f64e549995c6caffected · git
    • e126ba97dba9edeb6fafa3665b5f8497fc9cdf8c and later · before dec47e4b0fe34afdf38caa72b4408ba95502e5deaffected · git
    • before 3.11not affected · semver

Package-level exposure

OSV and GitHub Advisory data: ecosystem, package and range. SBOM matching uses this table.

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.190-16.1.190-1
Debian:12linux-6.12before 6.12.111-1~deb12u16.12.111-1~deb12u1
Debian:13linuxbefore 6.12.111-16.12.111-1
Debian:14linuxbefore 7.2.6-17.2.6-1

Same product

linux: all records

Other highest-scoring records for the same primary product.

  • CVE-2026-74705udp: fix potential use-after-free in tunnel segmentation
    40Plan
  • CVE-2026-74612veth: fix skb length accounting after XDP frag adjustment
    40Plan
  • CVE-2026-74475vxlan: use neigh_ha_snapshot() in route_shortcircuit()
    40Plan

Published before and after this one in the same product

  • ← EarlierCVE-2026-90433Sep 17, 2026 · spi: oc-tiny: switch to managed controller allocation
    0Monitor
  • ← EarlierCVE-2026-90434Sep 17, 2026 · isofs: release zisofs block pointer buffer head
    0Monitor
  • Later →CVE-2026-92476Sep 17, 2026 · crypto: keembay - Initialize completion before requesting IRQ
    0Monitor

Remediation

Which version to upgrade to

Fix versions compiled from the vendor, package registries and Microsoft. Verify the vendor's note before upgrading.

Product / packageFixed versionSource
Linux Linux42fb8aefffff5b458aaa66803364a16e0ea44129Vendor (CNA)
Linux Linux5b6cfc6d7ff0959dd9766fdc24286a253b59ca77Vendor (CNA)
Linux Linuxc845e5e05140ea1bc64a5b1107942d93c876034dVendor (CNA)
Linux Linuxccce6b7ef1d7efc59ccba3421e1339c6e63a3d20Vendor (CNA)
Linux Linuxd7fa2ff72ad1861eac194a4e0075d504ba8c246eVendor (CNA)
Linux Linuxd99622e40aaa910ade681dfd4dc0fa240a011331Vendor (CNA)
Linux Linuxdec47e4b0fe34afdf38caa72b4408ba95502e5deVendor (CNA)
Linux Linuxf917707f0de0832b8ab582391b1f64e549995c6cVendor (CNA)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.111-1 · Debian:13Package registry (OSV)
debian:linux-6.126.12.111-1~deb12u1 · Debian:12Package registry (OSV)

Exploit status

No known public exploit

No public exploit has been observed yet. That doesn't mean you're safe, only that the bar is a little higher.

Research context

For pentesters and researchers: attack profile, score disagreement, timeline, patch commits, credits, variant and chain candidates, bug bounty scope. All derived from existing data; no exploit code.

Timeline

From publication to today: proof of concept, Metasploit module, CISA KEV and fix record. Dates are as reported by the sources.

No dated events beyond publication.

EPSS, last 120 days

FIRST EPSS daily score; only changes of 0.01 or more are recorded (step chart).

Patch and commit links

Commit, PR and diff links among the references. A starting point for patch-diffing and variant hunting; fixes, not exploits.

No commit or PR link among the references.

Credits

All researchers

Finders, reporters and analysts named in the CNA record. Click a name for that researcher’s other records.

No credits in the CNA record.

Variant candidates

Same product, same weakness class, within 18 months. If the patch missed the root cause, the sibling bug is here.

No nightly-computed relations.

Chain candidates

An authentication bypass and a privilege-requiring bug in the same product, published close together: combined they may become an unauthenticated path.

—

Bug bounty scope

No known public program.

Source: bounty-targets-data (public HackerOne, Bugcrowd, Intigriti, YesWeHack listings).

Technical details

Attack conditions

  • Someone with local access to the system can trigger it.
  • A low-privileged account is enough.
  • No user action is required.
  • No special conditions are required; it is repeatable.

If successful

Confidentiality
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Local
Attack complexity
Low
Privileges required
Low
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

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

nvd-secondary

Attack context

MITRE CAPEC attack patterns and ATT&CK techniques for this weakness class (CWE). A starting point for detection rules and threat hunting.

MITRE has no CAPEC/ATT&CK mapping for this CWE.

Change log

  1. Fix✗ → ✓

For records you follow, these changes also arrive as notifications. →

References

Show all references (7 more)

Vendor advisories and official records. Exploit/PoC links are deliberately left out.

All records