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CVE-2026-98323

RDMA/siw: Bound fragmented header copies by the remaining length

No known exploitation. EPSS puts it in the 45th percentile. Fixed versions are out.

CVSS 3.19.8CriticalEPSS percentile45th0.6% chance in 30 daysCISA KEVNot listedNo confirmed exploitation
No public exploit knownFix1 product4 fixed builds listed below

Published Updated Sources: CVE.org, NVD

NVD CVE.org

What to do

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  • LinuxAffected: ≥ e3917c85f41ef1df64e27dc0e46ab0d803c5e73e, < 2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7Upgrade to: 2c6fbcf4bfac0b2b186acc8d91154c0fa24468a7Affected: ≥ 308cd50f174c95a507527037f4de1a0396aa4325, < af9f5b474a260ad23ffb9793d716a5e3bbce3b48Upgrade to: af9f5b474a260ad23ffb9793d716a5e3bbce3b48Affected: ≥ 754209850df8367c954ac1de7671c7430b1f342c, < 262dcd809723723ed8a4e05437ec7e9c21a8f17eUpgrade to: 262dcd809723723ed8a4e05437ec7e9c21a8f17eAffected: ≥ 754209850df8367c954ac1de7671c7430b1f342c, < eb4d7a946970469b3ab0c762432bf161d5b0836cUpgrade to: eb4d7a946970469b3ab0c762432bf161d5b0836c + 12 more branchesStated by: CVE record

Versions as the sources state them. Full version matrix after sign-in

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What it is

From the CVE record

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.

In plain language

No plain-language summary for this CVE yet.

Exploitation

Where each signal puts this CVE on the scale from published to confirmed exploited.

EPSS45th
CISA KEV

Not in the catalog. CISA has not confirmed exploitation.

Public exploits

No public exploit or proof of concept found in the sources we track.

EPSS

0.6% chance of exploitation activity in the next 30 days, which ranks it in the 45th percentile of scored CVEs.

Exploit Prediction Scoring System, FIRST.org. A probability, not a confirmation.

Lifecycle

3 events over 1 day, from the signal feeds we watch.

  1. Record updated
  2. Publishedrecord updated

Affected products

Technical detail

CVSS 3.1 vector

Open in the CVSS calculator

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

Scored 9.8 by NVD.

How it is reached

  • Attack Vector NetworkExploitable remotely over the network without any special conditions
  • Attack Complexity LowNo special conditions — the attack can be reliably reproduced
  • Privileges Required NoneNo authentication required — anyone can exploit this
  • User Interaction NoneNo user interaction needed — fully automated exploitation

Scope

  • Scope UnchangedImpact is limited to the vulnerable component itself

Impact if exploited

  • Confidentiality HighTotal information disclosure — all data in the component is compromised
  • Integrity HighTotal loss of integrity — attacker can modify any data in the component
  • Availability HighTotal denial of service — the component is completely unavailable

Sources

References in the record

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In the news

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