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CVE-2025-38264 (GCVE-0-2025-38264)

Vulnerability from cvelistv5 – Published: 2025-07-09 10:42 – Updated: 2026-08-05 12:00
VLAI
Title
nvme-tcp: sanitize request list handling
Summary
In the Linux kernel, the following vulnerability has been resolved: nvme-tcp: sanitize request list handling Validate the request in nvme_tcp_handle_r2t() to ensure it's not part of any list, otherwise a malicious R2T PDU might inject a loop in request list processing.
Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 3f2304f8c6d6ed97849057bd16fee99e434ca796 , < 78a4adcd3fedb0728436e8094848ebf4c6bae006 (git)
Affected: 3f2304f8c6d6ed97849057bd16fee99e434ca796 , < f054ea62598197714a6ca7b3b387a027308f8b13 (git)
Affected: 3f2304f8c6d6ed97849057bd16fee99e434ca796 , < 0bf04c874fcb1ae46a863034296e4b33d8fbd66c (git)
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Linux Linux Affected: 5.0
Unaffected: 0 , < 5.0 (semver)
Unaffected: 6.12.36 , ≤ 6.12.* (semver)
Unaffected: 6.15.5 , ≤ 6.15.* (semver)
Unaffected: 6.16 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/nvme/host/tcp.c"
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          "vendor": "Linux",
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              "status": "affected",
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              "versionType": "git"
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              "version": "0",
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnvme-tcp: sanitize request list handling\n\nValidate the request in nvme_tcp_handle_r2t() to ensure it\u0027s not part of\nany list, otherwise a malicious R2T PDU might inject a loop in request\nlist processing."
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              "value": "AV:N - The vulnerable code is the NVMe-over-TCP host driver\u0027s PDU receive path, parsing an R2T PDU sent by a remote NVMe-oF target over TCP (port 4420); the malicious input arrives purely over the network from a compromised/rogue target or an on-path attacker.\nAC:L - The target fully controls PDU content and timing \u2014 placing two R2T PDUs for the same command_id in a single TCP segment guarantees both are processed inside one nvme_tcp_recv_skb() pass with no send-path progress between them, creating the llist cycle deterministically with no race to win and no memory-layout dependency.\nPR:N - NVMe/TCP requires no authentication by default (TLS and DH-HMAC-CHAP are optional, off in stock configs), so the remote peer needs zero privileges or credentials on the victim host \u2014 it simply answers I/O it is already being sent.\nUI:N - No victim action is required; once the host is connected to the target, ordinary filesystem/block I/O generates the in-flight commands and the malicious target triggers the bug on its own by replying with duplicate R2T PDUs.\nS:U - The corruption and the resulting hang are confined to the host kernel\u0027s own memory and scheduling authority; no VM, IOMMU, or sandbox boundary is crossed.\nC:H - Beyond the list corruption, duplicate queueing lets the RX path reset req-\u003estate/offset/pdu_len while the TX path is consuming the request, desynchronizing req-\u003eiter so nvme_tcp_req_cur_page() reads past the bvec array and sock_sendmsg() splices unintended kernel pages directly to the attacker-controlled socket.\nI:H - Attacker-controlled input produces kernel linked-list pointer corruption (double llist_add plus repeated list_add of an already-linked entry into send_list) and lets an in-flight request\u0027s PDU header, ttag, and iterator state be rewritten mid-transfer, which is memory/state corruption leverageable for further control over kernel structures.\nA:H - The injected cycle makes nvme_tcp_process_req_list() spin forever in the nvme_tcp_wq kworker while holding queue-\u003esend_mutex with no cond_resched(), producing a CPU soft lockup, RCU stalls, and a permanently wedged storage queue \u2014 a deterministic, unauthenticated remote kernel hang."
            }
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    "assignerShortName": "Linux",
    "cveId": "CVE-2025-38264",
    "datePublished": "2025-07-09T10:42:38.602Z",
    "dateReserved": "2025-04-16T04:51:23.997Z",
    "dateUpdated": "2026-08-05T12:00:51.571Z",
    "state": "PUBLISHED"
  },
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      "product_status:under_investigation": "3",
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      "status": "final",
      "title": "nvme-tcp: sanitize request list handling",
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      "version": "21"
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    "redhat_vex": {
      "aggregate_severity": "Important",
      "current_release_date": "2026-07-30T08:52:00+00:00",
      "cve": "CVE-2025-38264",
      "id": "CVE-2025-38264",
      "initial_release_date": "2025-07-09T00:00:00+00:00",
      "product_status:fixed": "307",
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      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: nvme-tcp: sanitize request list handling",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2025/cve-2025-38264.json",
      "version": "3"
    }
  }
}



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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.


Detection rules are retrieved from Rulezet.