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NVD / CVE Program· CNA Linux

CVE-2026-74378: RDMA/rxe: Fix TOCTOU heap overflow in get_srq_wqe

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: 0.14% (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 02558c86b6b761063e9399e6b939984500327ef1, 22b8fbded65b8c441b634a185f8da67657df6c50, 3cfa2a3adc51b7c57729961a03446962ff10e3d2.

Low priority for now. Upgrade to Linux Linux 02558c86b6b761063e9399e6b939984500327ef1, 22b8fbded65b8c441b634a185f8da67657df6c50, 3cfa2a3adc51b7c57729961a03446962ff10e3d2 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/rxe: Fix TOCTOU heap overflow in get_srq_wqe get_srq_wqe() reads wqe->dma.num_sge from the shared receive queue buffer, which is mapped into userspace. It validates num_sge against max_sge, but then re-reads the same field to calculate the memcpy size. A concurrent userspace thread can modify num_sge between validation and use, causing a heap buffer overflow when copying the WQE into qp->resp.srq_wqe. Read num_sge into a local variable and use it for both the bounds check and the size calculation.

HighCVSS 7.8 · v3.1—No exploit Fix available
Published
Aug 15, 2026
Updated
Oct 16, 2026
EPSS
0.1% · 3th 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%

CISA SSVC decision

Exploitation
none
Automatable
no
Technical impact
total

Vulnrichment: CISA's decision-tree inputs.

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.

Get told when this record changes

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

If any of these changes, we'll tell you in the daily email digest.

Follow CVE-2026-74378

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

    • 4.8affected
    • 8700e3e7c4857d28ebaa824509934556da0b3e76 and later · before c8db0e5ab0b6c540214c46c56aaac7cbcb0967feaffected · git
    • 8700e3e7c4857d28ebaa824509934556da0b3e76 and later · before e48daa94ad2d406225b73491fc935064716f0ec7affected · git
    • 8700e3e7c4857d28ebaa824509934556da0b3e76 and later · before 3cfa2a3adc51b7c57729961a03446962ff10e3d2affected · git
    • 8700e3e7c4857d28ebaa824509934556da0b3e76 and later · before cd19a6345e3727adafafa5954b58b13c92e13b80affected · git
    • 8700e3e7c4857d28ebaa824509934556da0b3e76 and later · before 3e07ea9579dc9553d2285c26c2823931358aa3b8affected · git
    • 8700e3e7c4857d28ebaa824509934556da0b3e76 and later · before 02558c86b6b761063e9399e6b939984500327ef1affected · git
    • 8700e3e7c4857d28ebaa824509934556da0b3e76 and later · before b9800d7953d119bcc068c74587d48e4ba0313629affected · git
    • 8700e3e7c4857d28ebaa824509934556da0b3e76 and later · before 22b8fbded65b8c441b634a185f8da67657df6c50affected · git
    • before 4.8not affected · semver

Package-level exposure

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

EcosystemPackageAffected rangeFix
Debian:12linuxbefore 6.1.180-16.1.180-1
Debian:13linuxbefore 6.12.100-16.12.100-1
Debian:14linuxbefore 7.1.5-17.1.5-1

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-2026-74376Aug 15, 2026 · md/raid10: reset read_slot when reusing r10bio for discard
    39Monitor
  • ← EarlierCVE-2026-74377Aug 15, 2026 · RDMA/rxe: Copy WQE to local buffer in non-SRQ receive path
    31Monitor
  • Later →CVE-2026-74380Aug 15, 2026 · gpu: host1x: Fix iommu_map_sgtable() return value check
    35Monitor

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 Linux02558c86b6b761063e9399e6b939984500327ef1Vendor (CNA)
Linux Linux22b8fbded65b8c441b634a185f8da67657df6c50Vendor (CNA)
Linux Linux3cfa2a3adc51b7c57729961a03446962ff10e3d2Vendor (CNA)
Linux Linux3e07ea9579dc9553d2285c26c2823931358aa3b8Vendor (CNA)
Linux Linuxb9800d7953d119bcc068c74587d48e4ba0313629Vendor (CNA)
Linux Linuxc8db0e5ab0b6c540214c46c56aaac7cbcb0967feVendor (CNA)
Linux Linuxcd19a6345e3727adafafa5954b58b13c92e13b80Vendor (CNA)
Linux Linuxe48daa94ad2d406225b73491fc935064716f0ec7Vendor (CNA)
debian:linux6.1.180-1 · 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. SSVC exploitation— → none
  2. 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