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Review reviewCritical

CVE-2026-64269

Linux

In the Linux kernel, the following vulnerability has been resolved: RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg When the server answers an RTRS READ, rdma_write_sg() builds the source scatter/gather entry for the IB_WR_RDMA_WRITE that returns data to the peer. Its length is taken directly from the wire descriptor: plist->length = le32_to_cpu(id->rd_msg->desc[0].len); rd_msg points into the chunk buffer that the remote peer filled via RDMA-WRITE-WITH-IMM (rtrs_srv_rdma_done() -> process_io_req() -> process_read()), so desc[0].len is attacker-controlled and, before t...

CVSS
9.1
EPSS
-
- percentile
CISA KEV
Not listed
Published
2026.07.25
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability-
Technical severityCVSS 9.1

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: RDMA/rtrs-srv: Bound RDMA-Write length to chunk size in rdma_write_sg When the server answers an RTRS READ, rdma_write_sg() builds the source scatter/gather entry for the IB_WR_RDMA_WRITE that returns data to the peer. Its length is taken directly from the wire descriptor: plist->length = le32_to_cpu(id->rd_msg->desc[0].len); rd_msg points into the chunk buffer that the remote peer filled via RDMA-WRITE-WITH-IMM (rtrs_srv_rdma_done() -> process_io_req() -> process_read()), so desc[0].len is attacker-controlled and, before t...

Affected product and versions

Product
Linux
Affected versions
>= 9cb837480424e78ed585376f944088246685aec3 < 68c09762172f6224e9ddf9b0a60bacbb36e443eb, >= 9cb837480424e78ed585376f944088246685aec3 < 6cada540150894e81042a0ae0c796a21a9a877da, >= 9cb837480424e78ed585376f944088246685aec3 < 2912f3d40355dabc08fdbaaf2764d02445fe88dc, >= 9cb837480424e78ed585376f944088246685aec3 < 6f40246f4312fdbab5a13cc440adebf95eb2aa66, >= 9cb837480424e78ed585376f944088246685aec3 < 5a45d0aa1fa50a333ce5763ade744e2d89838667, >= 9cb837480424e78ed585376f944088246685aec3 < da3e44add94b05dfde56f898421922f5cf35705f, >= 9cb837480424e78ed585376f944088246685aec3 < 963af8d97a8c6a117134a8d0db1415e0489200b1, >= 5.8
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:N/A:H
CWE
Not available