Skip to content
Noroxi
CVE.org (no NVD analysis yet)· CNA Linux

CVE-2026-98323: RDMA/siw: Bound fragmented header copies by the remaining length

Noroxi assessment

Priority: Monitor (action score 39/100)

  • 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: 0.51% (FIRST EPSS).
  • Anyone who can reach it over the internet 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 262dcd809723723ed8a4e05437ec7e9c21a8f17e, 2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7, 5.10.271; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1.

Low priority for now. Upgrade to Linux Linux 262dcd809723723ed8a4e05437ec7e9c21a8f17e, 2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7, 5.10.271; azl3 kernel 6.6.157.1-1 on Azure Linux 3.0 6.6.158.1-1 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: RDMA/siw: Bound fragmented header copies by the remaining length siw_get_hdr() can receive an extended DDP/RDMAP header across more than one TCP callback. The first callback may receive most of the header, while the next one still limits the copy to hdrlen - MIN_DDP_HDR instead of the number of missing bytes. This makes the destination move past the end of the header and overwrite the receive state, including fpdu_part_rcvd. A later callback can then use a negative fpdu_part_rcvd value as a copy offset, which creates an OOB write. Use the number of header bytes already received when calculating the next copy length.

CriticalCVSS 9.8 · v3.1—No exploit Fix available
Published
Oct 6, 2026
Updated
Oct 19, 2026
EPSS
0.5% · 43th percentile
CWE
—

Report tools

JSON

Action score

39

Monitor

Low priority for now.

CVSS
39 / 40 · 9.8 / 10
CISA KEV
0 / 30 · Not listed
EPSS
0 / 30 · 0.5%

CNA vs NVD score

NVD
—
CNA · Linux
9.8
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-2026-98323

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

One daily email digest (06:00 UTC); connect a webhook for KEV listings and weaponized exploits instantly.

Your free account also gets you

Running WordPress? Scan your site free with WP Lens

  • Stack alerts: add the products and versions you run, get the new CVEs that affect them
  • Uptime monitoring: 1 site, instant email when it goes down
  • Add your domain: subdomains and takeover risk scanned every week (1 domain)
  • 10 scans an hour on the security tools (3 a day without an account), an API key and MCP
  • All your scans in one panel: findings, what changed in the last scan, a report per domain or per client (PDF, share link)
All free tools

Sign up with email · Have an account? Sign in

Free account, no card. Unfollow any time.

Don't want an account? Get "Exploited this week" by email every MondayDon't want an account? RSS feed for linux records

Running WordPress? Scan your site free with WP Lens

Is your version affected? Check it

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.

We use this product, ask for help

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

    • e09caa38e10bcf027100cc22b0e3cc745a39ef0a, 0c14f795a9eab9344230f9933798b8ee496f497d, 7fada7c6962219b6fc4ff4e62e46a936af110dd9, 6.1affected
    • e3917c85f41ef1df64e27dc0e46ab0d803c5e73e and later · before 2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7affected · git
    • 308cd50f174c95a507527037f4de1a0396aa4325 and later · before af9f5b474a260ad23ffb9793d716a5e3bbce3b48affected · git
    • 754209850df8367c954ac1de7671c7430b1f342c and later · before 262dcd809723723ed8a4e05437ec7e9c21a8f17eaffected · git
    • 754209850df8367c954ac1de7671c7430b1f342c and later · before eb4d7a946970469b3ab0c762432bf161d5b0836caffected · git
    • 754209850df8367c954ac1de7671c7430b1f342c and later · before 8628f8ebf41669302513fb3f0bf0eba38b226742affected · git
    • 754209850df8367c954ac1de7671c7430b1f342c and later · before b72dcfb9bf1f0f0147cda03dc59e4002a315067faffected · git
    • 754209850df8367c954ac1de7671c7430b1f342c and later · before e6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9daffected · git
    • 754209850df8367c954ac1de7671c7430b1f342c and later · before 9ff797e516dbc1ecb73701ec4c24055712d44411affected · git
    • 5.10.150 and later · before 5.10.271affected · 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 6.12.113-1~deb12u16.12.113-1~deb12u1
Debian:13linuxbefore 6.12.113-16.12.113-1
Debian:14linuxbefore 7.2.8-17.2.8-1

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-2026-98321Oct 6, 2026 · netfilter: nf_nat: unregister and release hooks on error
    0Monitor
  • ← EarlierCVE-2026-98322Oct 6, 2026 · netfilter: nft_nat: fully initialise new_addr in netmap setup
    0Monitor
  • Later →CVE-2026-98324Oct 6, 2026 · dmaengine: pxa: fix double counting of the hw descriptors
    31Monitor

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 Linux262dcd809723723ed8a4e05437ec7e9c21a8f17eVendor (CNA)
Linux Linux2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7Vendor (CNA)
Linux Linux5.10.271Vendor (CNA)
Linux Linux5.15.222Vendor (CNA)
Linux Linux5.20Vendor (CNA)
Linux Linux5.5Vendor (CNA)
Linux Linux6.1Vendor (CNA)
Linux Linux8628f8ebf41669302513fb3f0bf0eba38b226742Vendor (CNA)
Linux Linux9ff797e516dbc1ecb73701ec4c24055712d44411Vendor (CNA)
Linux Linuxaf9f5b474a260ad23ffb9793d716a5e3bbce3b48Vendor (CNA)
Linux Linuxb72dcfb9bf1f0f0147cda03dc59e4002a315067fVendor (CNA)
Linux Linuxe6bdfdf3bcb02d0d626a45e8c98b7e63d2fddf9dVendor (CNA)
Linux Linuxeb4d7a946970469b3ab0c762432bf161d5b0836cVendor (CNA)
azl3 kernel 6.6.157.1-1 on Azure Linux 3.06.6.158.1-1 · Release NotesMicrosoft (MSRC)
debian:linux6.1.190-1 · Debian:12Package registry (OSV)
debian:linux6.12.113-1 · Debian:13Package registry (OSV)
debian:linux7.2.8-1 · Debian:14Package registry (OSV)
debian:linux-6.126.12.113-1~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.

  1. Published
  2. Fix recordedsame day
  3. TodayNov 6, 2026+31 d
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

  • Anyone who can reach it over the internet 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
high · data can be read
Integrity
high · data or configuration can be modified
Availability
high · the service can be disrupted
Attack vector
Network
Attack complexity
Low
Privileges required
None
User interaction
None
Scope
Unchanged
Confidentiality impact
High
Integrity impact
High
Availability impact
High

Weakness class (CWE)

—

CVSS vector

CVSS:3.1/AV:N/AC:L/PR:N/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. CVSS— → 9.8
  2. Severity— → critical
  3. Exploit maturity— → none
  4. 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