NVD / CVE Program· CNA Linux

CVE-2026-68425: IB/mad: Drop unmatched RMPP responses before reassembly

Noroxi assessment

Priority: Monitor (action score 28/100)

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: 0.26% (FIRST EPSS).
Someone on the same network segment can trigger it. No account or password is required. No user action is required. No special conditions are required; it is repeatable.
Fixed version: Linux Linux 45416c87ebcece1e90f3bc5bc172d106b77c6b69, 6e1bd7f590b0ccfee07f7fe1d48b92059bd37d72, 9634fb1f4d404f36a20ffbcb8797369db69b06bb; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1.
Mentioned 1 time in Turkish national cyber security advisories (siberguvenlik.gov.tr).

Low priority for now. Upgrade to Linux Linux 45416c87ebcece1e90f3bc5bc172d106b77c6b69, 6e1bd7f590b0ccfee07f7fe1d48b92059bd37d72, 9634fb1f4d404f36a20ffbcb8797369db69b06bb; azl3 kernel 6.6.143.1-1 on Azure Linux 3.0 6.6.150.1-1 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: IB/mad: Drop unmatched RMPP responses before reassembly Kernel-handled RMPP receive processing starts reassembly for active DATA responses before the response is matched to an outstanding send. The normal match happens later, after ib_process_rmpp_recv_wc() has either assembled a complete message or consumed the segment. That ordering lets an unsolicited response that routes to a kernel RMPP agent by the high TID bits allocate or extend RMPP receive state before the full TID and source address are checked against a real request. A reordered burst can therefore reach the receive-side insertion path even though the response would not match any send. For kernel-handled RMPP DATA responses, require the existing ib_find_send_mad() match before entering RMPP reassembly. The matcher already checks the full TID, management class and source address/GID against the agent wait, backlog and in-flight send lists. If there is no match, drop the response without creating RMPP state. This leaves the RMPP window behavior unchanged and only rejects responses that have no corresponding request.

HighCVSS 7.1 · v3.1—No exploit Fix available

Published: Aug 10, 2026
Updated: Oct 19, 2026
EPSS: 0.2% · 17th percentile
CWE: CWE-400

Report tools

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Action score

Monitor

Low priority for now.

CVSS: 28 / 40 · 7.1 / 10
CISA KEV: 0 / 30 · Not listed
EPSS: 0 / 30 · 0.2%

CISA SSVC decision

Exploitation: none
Automatable: no
Technical impact: partial

Vulnrichment: CISA's decision-tree inputs.

CNA vs NVD score

NVD: —
CNA · Linux: 7.1; 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

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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.

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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
- 2.6.13affected
- fa619a77046bef30478697aba0553991033afb8e and later · before 45416c87ebcece1e90f3bc5bc172d106b77c6b69affected · git
- fa619a77046bef30478697aba0553991033afb8e and later · before 9634fb1f4d404f36a20ffbcb8797369db69b06bbaffected · git
- fa619a77046bef30478697aba0553991033afb8e and later · before bfb9e8243fd2099d1080d09222964d988f991d9baffected · git
- fa619a77046bef30478697aba0553991033afb8e and later · before dfa535c94406c03d3f0c869ef3ba5528e395737caffected · git
- fa619a77046bef30478697aba0553991033afb8e and later · before 6e1bd7f590b0ccfee07f7fe1d48b92059bd37d72affected · git
- fa619a77046bef30478697aba0553991033afb8e and later · before 98d2d468b4faa1fdc68c0c6c238389906ee3490caffected · git
- fa619a77046bef30478697aba0553991033afb8e and later · before ad9c9ad3204f63a46f0f7de29687a8e512f05e29affected · git
- fa619a77046bef30478697aba0553991033afb8e and later · before d2e52d610b9b09694261632340b801a421e0b0c5affected · git
- before 2.6.13not affected · semver

Package-level exposure

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

Ecosystem	Package	Affected range	Fix
Debian:12	linux	before 6.1.187-1	6.1.187-1
Debian:12	linux-6.12	before 6.12.101-1~deb12u1	6.12.101-1~deb12u1
Debian:13	linux	before 6.12.101-1	6.12.101-1
Debian:14	linux	before 7.1.6-1	7.1.6-1

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-2026-68419Aug 10, 2026 · RDMA/irdma: Prevent rereg_mr for non-mem regions
31Monitor
← EarlierCVE-2026-68421Aug 10, 2026 · sched_ext: Don't warn on core-sched forced idle in put_prev_task_scx()
0Monitor
Later →CVE-2026-68426Aug 10, 2026 · xfrm: fix stale skb->prev after async crypto steals a GSO segment
39Monitor

Remediation

Which version to upgrade to

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

Product / package	Fixed version	Source
Linux Linux	45416c87ebcece1e90f3bc5bc172d106b77c6b69	Vendor (CNA)
Linux Linux	6e1bd7f590b0ccfee07f7fe1d48b92059bd37d72	Vendor (CNA)
Linux Linux	9634fb1f4d404f36a20ffbcb8797369db69b06bb	Vendor (CNA)
Linux Linux	98d2d468b4faa1fdc68c0c6c238389906ee3490c	Vendor (CNA)
Linux Linux	ad9c9ad3204f63a46f0f7de29687a8e512f05e29	Vendor (CNA)
Linux Linux	bfb9e8243fd2099d1080d09222964d988f991d9b	Vendor (CNA)
Linux Linux	d2e52d610b9b09694261632340b801a421e0b0c5	Vendor (CNA)
Linux Linux	dfa535c94406c03d3f0c869ef3ba5528e395737c	Vendor (CNA)
azl3 kernel 6.6.143.1-1 on Azure Linux 3.0	6.6.150.1-1 · CBL-Mariner Releases	Microsoft (MSRC)
debian:linux	6.1.187-1 · Debian:12	Package registry (OSV)
debian:linux-6.12	6.12.101-1~deb12u1 · Debian:12	Package 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.

CVE-2026-6397422 days apartBluetooth: hci_sync: Set HCI_CMD_DRAIN_WORKQUEUE during device close
35Monitor
CVE-2026-681290 days apartgve: fix Rx queue stall on alloc failure
30Monitor

Chain candidates

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

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Bug bounty scope

No known public program.

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

National notice (Türkiye Cybersecurity Directorate / USOM)

Official security notices citing this record; remediation advice is on the agency's page.

TR-26-0800 · Aug 11, 2026(Linux Kernel Güvenlik Bildirimi)

All national notices →

Technical details

Attack conditions

Someone on the same network segment can trigger it.
No account or password is required.
No user action is required.
No special conditions are required; it is repeatable.

If successful

Confidentiality: none
Integrity: low · data or configuration can be modified
Availability: high · the service can be disrupted

Attack vector: Adjacent
Attack complexity: Low
Privileges required: None
User interaction: None
Scope: Unchanged
Confidentiality impact: None
Integrity impact: Low
Availability impact: High

Weakness class (CWE)

CWE-400 · Uncontrolled Resource Consumption

CVSS vector

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

nvd-secondary

Root cause

Code that parses nested structures sets no depth or size limit. A small input can turn into a disproportionate processing load.

The bug in code

The whole CWE-400 class

A representative example of this vulnerability class. Not the vendor's source code; it shows the faulty pattern and its fix.

Vulnerable

1function expand(node) {
2  return node.children.map(expand);
3}

Fixed

1const MAX_DEPTH = 32;
2function expand(node, depth = 0) {
3  if (depth > MAX_DEPTH) throw new Error("too deep");
4  return node.children.map((c) => expand(c, depth + 1));
5}

Attack context

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

Attack patterns (CAPEC)

ATT&CK techniques

Endpoint Denial of ServiceT1499

Change log

SSVC exploitation— → noneOct 16, 2026, 5:07 PM UTC
Fix✗ → ✓Sep 28, 2026, 10:07 PM UTC

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

References

git.kernel.org/stable/c/45416c87ebcece1e90f3bc5bc172d106b77c6b69

Show all references (7 more)

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

All records