CVE-2026-98323: RDMA/siw: Bound fragmented header copies by the remaining length
- Is it exploited?
Not on CISA's list. CISA has not added it to the Known Exploited Vulnerabilities catalog as of . If CISA adds it, this page shows it as known exploited.
- How likely is exploitation in the next 30 days?
- 0.5%
Down from 0.6% on .
EPSS score, percentile 43.7 of all scored records. A probability estimated by FIRST, not a report of exploitation.
- How severe?
- 9.8 Critical
CVSS v3.1 base score, given by the CNA
- What should I do?
CISA has set no required action, because the vulnerability is not in KEV.
The CVE record links no vendor advisory, patch or mitigation.
- Which versions are affected?
Affected
- from 5.10.150 to before 5.10.271
- 6.1
Unaffected before 6.1; 5.10.271; 5.15.222; 6.1.189; 6.6.158; 6.12.112; and 3 more
Source: CISA KEV 2026.10.29, as of ; FIRST EPSS, as of ; CVE List, as of . About the data.
What to do
Advisories and patches
The CVE record links no vendor advisory, patch or mitigation.
This summary is based on the CVE record as of . Check the vendor's advisory before you act: affected versions and fixes can change.
Affected products and versions
As listed in the CVE record.
| Status | Versions |
|---|---|
| Affected | from e3917c85f41e to before 2c6fbcf4bfac |
| Affected | from 308cd50f174c to before af9f5b474a26 |
| Affected | from 754209850df8 to before 262dcd809723 |
| Affected | from 754209850df8 to before eb4d7a946970 |
| Affected | from 754209850df8 to before 8628f8ebf416 |
| Affected | from 754209850df8 to before b72dcfb9bf1f |
| Affected | from 754209850df8 to before e6bdfdf3bcb0 |
| Affected | from 754209850df8 to before 9ff797e516db |
| Affected | e09caa38e10b |
| Affected | 0c14f795a9ea |
| Affected | 7fada7c69622 |
| Affected | from 5.10.150 to before 5.10.271 |
Versions not listed are: unaffected.
And 4 more version entries in the CVE record.
| Status | Versions |
|---|---|
| Affected | 6.1 |
| Unaffected | before 6.1 |
| Unaffected | 5.10.271 |
| Unaffected | 5.15.222 |
| Unaffected | 6.1.189 |
| Unaffected | 6.6.158 |
| Unaffected | 6.12.112 |
| Unaffected | 6.18.54 |
| Unaffected | 7.2.8 |
| Unaffected | 7.3 |
Versions not listed are: affected.
Versions the record lists as unaffected: 5.10.271, 5.15.222, 6.1.189, 6.6.158, 6.12.112, 6.18.54, 7.2.8, 7.3.
Source: CVE List, as of . About the data.
About this vulnerability
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 des…
Summary: CVE record, as of .
- CISA has not added CVE-2026-98323 to its Known Exploited Vulnerabilities (KEV) catalog, as of 29 Oct 2026.
- The CVE record was published on 6 Oct 2026.
- The CVE record carries a CVSS v3.1 base score of 9.8 (Critical), given by its CNA.
- FIRST's EPSS model puts the probability of exploitation in the next 30 days at 0.5% (percentile 43.7), as of 29 Oct 2026. EPSS is a statistical estimate, not a report of exploitation.
Source: CISA KEV 2026.10.29, as of ; CVE List, as of ; FIRST EPSS, as of . About the data.
Description
RDMA/siw: Bound fragmented header copies by the remaining length
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.
Source: CVE List, as of . About the data.
Timeline
| Date | Event |
|---|---|
| CVE record published | |
| CVE record last updated |
References
8
Known exploited Linux vulnerabilities
- CVE-2026-46300: Linux Kernel Missing Initialization of a Variable Vulnerability
- CVE-2025-39682: Linux Kernel Improper Check for Unusual or Exceptional Conditions Vulnerability
- CVE-2025-39964: Linux Kernel Race Condition Vulnerability
- CVE-2026-53266: Linux Kernel Out-of-Bounds Write Vulnerability
- CVE-2026-53362: Linux Kernel Unspecified Vulnerability