CVE-2026-99028 (GCVE-0-2026-99028)

Vulnerability from cvelistv5 – Published: 2026-10-23 12:21 – Updated: 2026-10-23 12:21
VLAI
Title
net: xilinx: axienet: Free outstanding DMA buffers on dmaengine stop
Summary
In the Linux kernel, the following vulnerability has been resolved: net: xilinx: axienet: Free outstanding DMA buffers on dmaengine stop In the dmaengine path the driver pre-submits RX buffers and holds in-flight TX buffers whose SKBs are DMA-mapped by the driver and freed only in the completion callbacks. On ndo_stop() dmaengine_terminate_sync() aborts these descriptors without running their callbacks, and the driver then frees only the ring shells, leaking every SKB still owned by the engine and its DMA mapping on each ifdown. With 128 RX buffers pre-posted per channel, the mapping leak can eventually exhaust a limited IOMMU aperture. Clear the slot's skb in the TX and RX callbacks so a non-NULL skb marks a slot that still owns a live, DMA-mapped buffer, and on stop unmap and free every such buffer. axienet_dma_rx_cb() runs from the DMA tasklet and re-arms the RX ring on each completion, so it can race axienet_stop(): a completion may submit a fresh buffer after dmaengine_terminate_sync() has returned, leaving the channel armed with a buffer the teardown then frees while the engine may still write into it (dma_release_channel() does not stop it either). Add a lock that axienet_dma_rx_cb() holds across the @stopping check and the resubmit, and axienet_stop() holds to set @stopping before terminating. Once @stopping is set no callback can arm a new buffer, and any armed just before is aborted by the terminate, so teardown only frees buffers the engine no longer owns.
Severity
No CVSS data available.
Assigner
Linux CNA under the mitre root
CNA scorecard D 53/100 over 6848 records in the last 180 days details
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: 6a91b846af85a24241decd686269e8e038eb13d1 , < 079396129da5e7cb40ca0920aa1b9525bef6097c (git)
Affected: 6a91b846af85a24241decd686269e8e038eb13d1 , < eececf7c3a679d9c08175ad6bacbc8c31848f5af (git)
Affected: 6a91b846af85a24241decd686269e8e038eb13d1 , < 5e5cf3ad7c099ff86ea9e422cddb25a2e5317b58 (git)
Affected: 6a91b846af85a24241decd686269e8e038eb13d1 , < bcf2573a68a808a5b54cadafa72b6672e662c2bf (git)
guessed Create a notification for this product.
Linux Linux Affected: 6.8
Unaffected: 0 , < 6.8 (semver)
Unaffected: 6.12.114 , ≤ 6.12.* (semver)
Unaffected: 6.18.58 , ≤ 6.18.* (semver)
Unaffected: 7.2.11 , ≤ 7.2.* (semver)
Unaffected: 7.3 , ≤ * (original_commit_for_fix)
guessed Create a notification for this product.
Show details on NVD website
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/xilinx/xilinx_axienet.h",
            "drivers/net/ethernet/xilinx/xilinx_axienet_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "6a91b846af85a24241decd686269e8e038eb13d1",
              "versionType": "git"
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              "versionType": "git"
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              "versionType": "git"
            }
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        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "drivers/net/ethernet/xilinx/xilinx_axienet.h",
            "drivers/net/ethernet/xilinx/xilinx_axienet_main.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "6.8"
            },
            {
              "lessThan": "6.8",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.114",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.58",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "7.2.*",
              "status": "unaffected",
              "version": "7.2.11",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.3",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.12.114",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.58",
                  "versionStartIncluding": "6.8",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
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                },
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                  "versionEndExcluding": "7.3",
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                }
              ],
              "negate": false,
              "operator": "OR"
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      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: xilinx: axienet: Free outstanding DMA buffers on dmaengine stop\n\nIn the dmaengine path the driver pre-submits RX buffers and holds\nin-flight TX buffers whose SKBs are DMA-mapped by the driver and freed\nonly in the completion callbacks. On ndo_stop() dmaengine_terminate_sync()\naborts these descriptors without running their callbacks, and the driver\nthen frees only the ring shells, leaking every SKB still owned by the\nengine and its DMA mapping on each ifdown. With 128 RX buffers pre-posted\nper channel, the mapping leak can eventually exhaust a limited IOMMU\naperture.\n\nClear the slot\u0027s skb in the TX and RX callbacks so a non-NULL skb marks a\nslot that still owns a live, DMA-mapped buffer, and on stop unmap and free\nevery such buffer.\n\naxienet_dma_rx_cb() runs from the DMA tasklet and re-arms the RX ring on\neach completion, so it can race axienet_stop(): a completion may submit a\nfresh buffer after dmaengine_terminate_sync() has returned, leaving the\nchannel armed with a buffer the teardown then frees while the engine may\nstill write into it (dma_release_channel() does not stop it either). Add a\nlock that axienet_dma_rx_cb() holds across the @stopping check and the\nresubmit, and axienet_stop() holds to set @stopping before terminating.\nOnce @stopping is set no callback can arm a new buffer, and any armed just\nbefore is aborted by the terminate, so teardown only frees buffers the\nengine no longer owns."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-23T12:21:20.294Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
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          "url": "https://git.kernel.org/stable/c/079396129da5e7cb40ca0920aa1b9525bef6097c"
        },
        {
          "url": "https://git.kernel.org/stable/c/eececf7c3a679d9c08175ad6bacbc8c31848f5af"
        },
        {
          "url": "https://git.kernel.org/stable/c/5e5cf3ad7c099ff86ea9e422cddb25a2e5317b58"
        },
        {
          "url": "https://git.kernel.org/stable/c/bcf2573a68a808a5b54cadafa72b6672e662c2bf"
        }
      ],
      "title": "net: xilinx: axienet: Free outstanding DMA buffers on dmaengine stop",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-99028",
    "datePublished": "2026-10-23T12:21:20.294Z",
    "dateReserved": "2026-09-25T10:25:14.386Z",
    "dateUpdated": "2026-10-23T12:21:20.294Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
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      "date": "2026-11-03",
      "epss": "0.00168",
      "percentile": "0.06213"
    },
    "microsoft_vex": {
      "current_release_date": "2026-10-25T01:04:58.000Z",
      "cve": "CVE-2026-99028",
      "id": "msrc_CVE-2026-99028",
      "initial_release_date": "2026-10-25T01:04:58.000Z",
      "product_status:under_investigation": "1",
      "source": "Microsoft CSAF VEX",
      "status": "final",
      "title": "net: xilinx: axienet: Free outstanding DMA buffers on dmaengine stop",
      "url": "https://msrc.microsoft.com/csaf/vex/2026/msrc_cve-2026-99028.json",
      "version": "1"
    },
    "nvd": {
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                "defaultStatus": "unaffected",
                "product": "Linux",
                "programFiles": [
                  "drivers/net/ethernet/xilinx/xilinx_axienet.h",
                  "drivers/net/ethernet/xilinx/xilinx_axienet_main.c"
                ],
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                  },
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                    "status": "affected",
                    "version": "6a91b846af85a24241decd686269e8e038eb13d1",
                    "versionType": "git"
                  }
                ]
              },
              {
                "defaultStatus": "affected",
                "product": "Linux",
                "programFiles": [
                  "drivers/net/ethernet/xilinx/xilinx_axienet.h",
                  "drivers/net/ethernet/xilinx/xilinx_axienet_main.c"
                ],
                "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
                "vendor": "Linux",
                "versions": [
                  {
                    "status": "affected",
                    "version": "6.8"
                  },
                  {
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                    "status": "unaffected",
                    "version": "0",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.12.*",
                    "status": "unaffected",
                    "version": "6.12.114",
                    "versionType": "semver"
                  },
                  {
                    "lessThanOrEqual": "6.18.*",
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                    "version": "6.18.58",
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                  }
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            ],
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          }
        ],
        "cveTags": [],
        "descriptions": [
          {
            "lang": "en",
            "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nnet: xilinx: axienet: Free outstanding DMA buffers on dmaengine stop\n\nIn the dmaengine path the driver pre-submits RX buffers and holds\nin-flight TX buffers whose SKBs are DMA-mapped by the driver and freed\nonly in the completion callbacks. On ndo_stop() dmaengine_terminate_sync()\naborts these descriptors without running their callbacks, and the driver\nthen frees only the ring shells, leaking every SKB still owned by the\nengine and its DMA mapping on each ifdown. With 128 RX buffers pre-posted\nper channel, the mapping leak can eventually exhaust a limited IOMMU\naperture.\n\nClear the slot\u0027s skb in the TX and RX callbacks so a non-NULL skb marks a\nslot that still owns a live, DMA-mapped buffer, and on stop unmap and free\nevery such buffer.\n\naxienet_dma_rx_cb() runs from the DMA tasklet and re-arms the RX ring on\neach completion, so it can race axienet_stop(): a completion may submit a\nfresh buffer after dmaengine_terminate_sync() has returned, leaving the\nchannel armed with a buffer the teardown then frees while the engine may\nstill write into it (dma_release_channel() does not stop it either). Add a\nlock that axienet_dma_rx_cb() holds across the @stopping check and the\nresubmit, and axienet_stop() holds to set @stopping before terminating.\nOnce @stopping is set no callback can arm a new buffer, and any armed just\nbefore is aborted by the terminate, so teardown only frees buffers the\nengine no longer owns."
          }
        ],
        "id": "CVE-2026-99028",
        "lastModified": "2026-10-23T13:17:25.843",
        "metrics": {},
        "published": "2026-10-23T13:17:25.843",
        "references": [
          {
            "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
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          },
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          }
        ],
        "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "vulnStatus": "Received"
      }
    },
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-10-29T08:13:23+00:00",
      "cve": "CVE-2026-99028",
      "id": "CVE-2026-99028",
      "initial_release_date": "2026-10-23T00:00:00+00:00",
      "product_status:known_not_affected": "278",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: net: xilinx: axienet: Free outstanding DMA buffers on dmaengine stop",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-99028.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-10-28T00:47:42Z",
      "cve": "CVE-2026-99028",
      "id": "CVE-2026-99028",
      "initial_release_date": "2026-10-23T23:51:38Z",
      "product_status:known_affected": "13",
      "product_status:known_not_affected": "335",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-99028",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/2026/cve-2026-99028.json",
      "version": "4"
    }
  }
}



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