CVE-2026-93037 (GCVE-0-2026-93037)

Vulnerability from cvelistv5 – Published: 2026-09-17 16:10 – Updated: 2026-09-18 17:55
VLAI
Title
RDMA/hfi1: Propagate sdma_txinit_ahg() errors
Summary
In the Linux kernel, the following vulnerability has been resolved: RDMA/hfi1: Propagate sdma_txinit_ahg() errors set_txreq_header_ahg() ignores the return value of sdma_txinit_ahg(). If sdma_txinit_ahg() fails, it returns before initializing tx->txreq. However, set_txreq_header_ahg() ignores the error and returns the AHG change count, causing the caller to continue processing the request as though initialization had succeeded. Propagate sdma_txinit_ahg() failures to the caller and abort request processing when initialization fails. Found by Linux Verification Center (linuxtesting.org) with SVACE.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: e3304b7cc4f14d365f46d6847a35563ae8b017f7 , < cb73c2fe6e9cf563c99f22b7c8bca0d5f70d603e (git)
Affected: e3304b7cc4f14d365f46d6847a35563ae8b017f7 , < 122a730675565ff2ad210537c3fc3afb8291d482 (git)
Affected: e3304b7cc4f14d365f46d6847a35563ae8b017f7 , < bf974994150cfd14bfc599748925f4d426e00d90 (git)
Affected: e3304b7cc4f14d365f46d6847a35563ae8b017f7 , < fd6dee13f3857259b6b2ddd28e1ed95fd94ae2f9 (git)
Affected: e3304b7cc4f14d365f46d6847a35563ae8b017f7 , < 5b7cefffd15d87c8103865f887cdcf9077d8094b (git)
Affected: e3304b7cc4f14d365f46d6847a35563ae8b017f7 , < 3416db552eb378e54cb2f2ce0db5f0df88654bda (git)
Affected: e3304b7cc4f14d365f46d6847a35563ae8b017f7 , < ca99431820e8cac19f6a091c04da54cbe8d64f52 (git)
Affected: e3304b7cc4f14d365f46d6847a35563ae8b017f7 , < 091c6162c022cbdfb64219708a71728cfd1d4600 (git)
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Linux Linux Affected: 4.14
Unaffected: 0 , < 4.14 (semver)
Unaffected: 5.10.270 , ≤ 5.10.* (semver)
Unaffected: 5.15.221 , ≤ 5.15.* (semver)
Unaffected: 6.1.188 , ≤ 6.1.* (semver)
Unaffected: 6.6.157 , ≤ 6.6.* (semver)
Unaffected: 6.12.110 , ≤ 6.12.* (semver)
Unaffected: 6.18.52 , ≤ 6.18.* (semver)
Unaffected: 7.2.6 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
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          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nRDMA/hfi1: Propagate sdma_txinit_ahg() errors\n\nset_txreq_header_ahg() ignores the return value of sdma_txinit_ahg().\n\nIf sdma_txinit_ahg() fails, it returns before initializing tx-\u003etxreq.\nHowever, set_txreq_header_ahg() ignores the error and returns the AHG\nchange count, causing the caller to continue processing the request as\nthough initialization had succeeded.\n\nPropagate sdma_txinit_ahg() failures to the caller and abort request\nprocessing when initialization fails.\n\nFound by Linux Verification Center (linuxtesting.org) with SVACE."
        }
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            "version": "3.1"
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              "value": "AV:L - The attacker-controlled bytes are the sdma_req_info/header/iovecs copy_from_user()\u0027d in hfi1_user_sdma_process_request(), reached only from hfi1_write_iter() on the hfi1 user cdev. A remote Omni-Path peer does not supply that request; kernel verbs already check sdma_txinit_ahg() and are not this bug.\nAC:L - On the AHG path (npkts\u003e1 and HFI1_CAP_IS_USET(SDMA_AHG) so ahg_idx\u003e=0), the attacker sets a later packet\u0027s datalen to 0 or info.fragsize\u003eMAX_SDMA_PKT_SIZE so sdma_txinit_ahg() returns -ENODATA/-EMSGSIZE. set_txreq_header_ahg() still returns the AHG index count, and user_sdma_send_pkts() continues with no race.\nPR:L - hfi1_user_devnode() creates /dev/hfi1_N with mode 0666, and hfi1_file_open()/assign_ctxt() perform no capability checks, so an ordinary unprivileged local user can assign a context and writev() the crafted SDMA request.\nUI:N - Exploitation is the attacker\u0027s own open, HFI1_IOCTL_ASSIGN_CTXT, and writev() of a multi-packet user SDMA request; no other user must mount media, open a file, or otherwise interact.\nS:U - The uninitialized user_sdma_txreq.txreq is consumed by make_tx_sdma_desc() and submit_tx() inside the host hfi1 driver; impact is host-kernel memory/DMA corruption, not a guest-to-host, IOMMU, or other authority-boundary escape.\nC:H - user_sdma_send_pkts() still calls hfi1_add_pages_to_sdma_packet() after the failed sdma_txinit_ahg(), and make_tx_sdma_desc() reads/writes through uninitialized tx-\u003edescp. A recycled txreq_cache object whose extended descp was kfree\u0027d in __sdma_txclean() is a use-after-free, enabling kernel info disclosure.\nI:H - make_tx_sdma_desc() writes DMA address and length through that uninitialized/dangling descp, and submit_tx() copies those descriptors into the SDMA ring. That is an arbitrary kernel write and hardware DMA of attacker-influenced descriptors, enabling control-flow hijack.\nA:H - submit_tx() always loads descp-\u003eqw[0] even when num_desc is 0, so a NULL descp from an uninitialized txreq is a kernel NULL-deref oops; garbage num_desc/descriptors also crash or halt the SDMA engine."
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        {
          "url": "https://git.kernel.org/stable/c/091c6162c022cbdfb64219708a71728cfd1d4600"
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      "title": "RDMA/hfi1: Propagate sdma_txinit_ahg() errors",
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    "datePublished": "2026-09-17T16:10:31.452Z",
    "dateReserved": "2026-09-17T15:57:05.656Z",
    "dateUpdated": "2026-09-18T17:55:40.342Z",
    "state": "PUBLISHED"
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          }
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        "lastModified": "2026-09-18T18:18:18.580",
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                "confidentialityImpact": "HIGH",
                "integrityImpact": "HIGH",
                "privilegesRequired": "LOW",
                "scope": "UNCHANGED",
                "userInteraction": "NONE",
                "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
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              "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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        "published": "2026-09-17T17:17:56.750",
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        "vulnStatus": "Received"
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      "current_release_date": "2026-09-22T16:26:00Z",
      "cve": "CVE-2026-93037",
      "id": "CVE-2026-93037",
      "initial_release_date": "2026-09-22T16:26:00Z",
      "product_status:known_affected": "329",
      "product_status:known_not_affected": "18",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-93037",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-93037.json",
      "version": "2"
    }
  }
}



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Taxonomy of the tags.





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.



Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.