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CVE-2026-74345 Linux CVE debrief

A use-after-free vulnerability was found in the Linux kernel's RDMA/siw endpoint/socket association handling. The vulnerability occurs when disassociating a socket from an endpoint via siw_socket_disassoc(), which may release the last reference on that endpoint and free it. Therefore, don't clear the endpoint's socket pointer after calling that function, but within. This fixes a BUG: KASAN: slab-use-after-free in siw_cm_work_handler.

Vendor
Linux
Product
Unknown
CVSS
CRITICAL 9.8
CISA KEV
Not listed in stored evidence
Original CVE published
2026-08-15
Original CVE updated
2026-10-21
Advisory published
2026-08-15
Advisory updated
2026-10-21

Who should care

Linux kernel developers and maintainers, Linux distribution vendors, and users of Linux-based systems, particularly those responsible for vulnerability management, security teams, and operators of affected systems, should assess exposure and apply patches or mitigations as soon as possible.

Why it matters

This vulnerability is significant because it can be exploited remotely, potentially leading to denial of service or even remote code execution on affected Linux systems. Linux kernel developers, maintainers, and users should assess exposure and apply patches or mitigations as soon as possible.

  • Potential remote code execution
  • Denial of Service (DoS) via exploitation of the vulnerability
  • Elevation of privileges on affected systems

Technical summary

The vulnerability occurs in the Linux kernel's RDMA/siw endpoint/socket association handling. When disassociating a socket from an endpoint via siw_socket_disassoc(), it may release the last reference on that endpoint and free it. Therefore, don't clear the endpoint's socket pointer after calling that function, but within. This issue can be mitigated by reviewing and applying the provided patches to fix the vulnerability and updating the Linux kernel to the latest version. The vulnerability was introduced in Linux kernel and fixed by multiple commits: ff584d3735b13a1d7f8cd072f98fea40b6062518, b28d513393f81e2de00f82970487a9d001557e4e, f6183983ce1ff254d629a333739082b39d7c5eb6, b6cf763eee0a932792bef64ceaca568d324

Defensive priority

High

Recommended defensive actions

  • Review and apply the provided patches to fix the vulnerability
  • Update Linux kernel to the latest version
  • Monitor system for potential exploitation attempts
  • Review compensating controls for exposed systems while remediation is scheduled and verified
  • Check relevant monitoring, detection, and logs for exposed assets that need extra review
  • Track exceptions, retest remediated assets, and close the item only after evidence is documented
  • Confirm whether affected product deployments exist in managed environments and assign an owner for follow-up

Evidence notes

The vulnerability was introduced in Linux kernel and fixed by multiple commits: ff584d3735b13a1d7f8cd072f98fea40b6062518, b28d513393f81e2de00f82970487a9d001557e4e, f6183983ce1ff254d629a333739082b39d7c5eb6, b6cf763eee0a932792bef64ceaca568d324192fc, and ea4f6f6c53577fb3f05dbd78b15e586772d49831.

Sources and references

Verified primary and authoritative sources

  • CVE-2026-74345 CVE Program record

    Publisher, destination, and source semantics verified

    URL: https://www.cve.org/CVERecord?id=CVE-2026-74345

    CVE Program - Official CVE Program record with source-provided CVE metadata.

  • CVE-2026-74345 NVD vulnerability detail

    Publisher, destination, and source semantics verified

    URL: https://nvd.nist.gov/vuln/detail/CVE-2026-74345

    NIST National Vulnerability Database - Official NIST NVD detail page and source-specific vulnerability assessment.

Supplemental references

  • RDMA/siw: Fix endpoint/socket association handling

    Unverified legacy reference

    URL: https://raw.githubusercontent.com/CVEProject/cvelistV5/main/cves/2026/74xxx/CVE-2026-74345.json

    cve_program_cvelist_v5

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/ff584d3735b13a1d7f8cd072f98fea40b6062518

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/b28d513393f81e2de00f82970487a9d001557e4e

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/f6183983ce1ff254d629a333739082b39d7c5eb6

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/b6cf763eee0a932792bef64ceaca568d324192fc

    Supplemental source

  • Source reference

    Unverified legacy reference

    URL: https://git.kernel.org/stable/c/ea4f6f6c53577fb3f05dbd78b15e586772d49831

    Supplemental source

Methodology and review provenance

AI-assisted synthesis based on stored public vulnerability evidence. System validation, approval state, and publication status do not by themselves establish human review of this revision. PatchSiren helps prioritize defensive review and does not prove exposure or remediation on any system.