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usb: chipidea: udc: fix DMA and SG cleanup in _ep_nuke()

Type: advisorySource: Official CVE List1 source record

In the Linux kernel, the following vulnerability has been resolved: usb: chipidea: udc: fix DMA and SG cleanup in _ep_nuke() The ChipIdea UDC driver can encounter "not page aligned sg buffer" errors when a USB device is reconnected after being disconnected during an active transfer. This occurs because _ep_nuke() returns requests to the gadget layer without properly unmapping DMA buffers or cleaning up scatter-gather bounce buffers. Root cause: When a disconnect happens during a multi-segment DMA transfer, the request's num_mapped_sgs field and sgt.sgl pointer remain set with stale values. The request is returned to the gadget driver with status -ESHUTDOWN but still has active DMA state. If the gadget driver reuses this request on reconnect without reinitializing it, the stale DMA state causes _hardware_enqueue() to skip DMA mapping (seeing non-zero num_mapped_sgs) and attempt to use freed/invalid DMA addresses, leading to alignment errors and potential memory corruption. The normal completion path via _hardware_dequeue() properly calls usb_gadget_unmap_request_by_dev() and sglist_do_debounce() before returning the request. The _ep_nuke() path must do the same cleanup to ensure requests are returned in a clean, reusable state. Fix: Add DMA unmapping and bounce buffer cleanup to _ep_nuke() to mirror the cleanup sequence in _hardware_dequeue(): - Call usb_gadget_unmap_request_by_dev() if num_mapped_sgs is set - Call sglist_do_debounce() with copy=false if bounce buffer exists T

Announced Source revision 1
Original source ↗

CVE-2026-43250

Primary source · Revision 1

Imported from structured advisory data. Source references identify upstream records or fields; verify affected versions and your deployed configuration.

Security context

Source reference: cve:CVE-2026-43250

Linux

Source reference: /containers/cna/affected/0/product

Affected versions
Not stated in this record
Fixed versions
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Prerequisites
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Linux

Source reference: /containers/cna/affected/1/product

Affected versions
Not stated in this record
Fixed versions
Not stated in this record
Prerequisites
Not stated in this record

Structured affected-version data

Original package identities and version rules from this source.

[
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "aa69a8093ff985873cb44fe1157bd6db29a20fe4",
        "lessThan": "aad97c92119cb85db105ddda4a44c86cc0748e8c",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "aa69a8093ff985873cb44fe1157bd6db29a20fe4",
        "lessThan": "1b72b834511d17f4d069d512f78671f3f210a2f1",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "aa69a8093ff985873cb44fe1157bd6db29a20fe4",
        "lessThan": "f4fbf2d4750d12ac8525d2efac1016fa0d84d4ec",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "aa69a8093ff985873cb44fe1157bd6db29a20fe4",
        "lessThan": "e74c436f8568af1c60942469d0a2300b3ada3857",
        "versionType": "git"
      },
      {
        "status": "affected",
        "version": "aa69a8093ff985873cb44fe1157bd6db29a20fe4",
        "lessThan": "cea2a1257a3b5ea3e769a445b34af13e6aa5a123",
        "versionType": "git"
      }
    ],
    "programFiles": [
      "drivers/usb/chipidea/udc.c"
    ],
    "defaultStatus": "unaffected"
  },
  {
    "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
    "vendor": "Linux",
    "product": "Linux",
    "versions": [
      {
        "status": "affected",
        "version": "2.6.29"
      },
      {
        "status": "unaffected",
        "version": "0",
        "lessThan": "2.6.29",
        "versionType": "semver"
      },
      {
        "status": "unaffected",
        "version": "6.6.160",
        "versionType": "semver",
        "lessThanOrEqual": "6.6.*"
      },
      {
        "status": "unaffected",
        "version": "6.12.75",
        "versionType": "semver",
        "lessThanOrEqual": "6.12.*"
      },
      {
        "status": "unaffected",
        "version": "6.18.16",
        "versionType": "semver",
        "lessThanOrEqual": "6.18.*"
      },
      {
        "status": "unaffected",
        "version": "6.19.6",
        "versionType": "semver",
        "lessThanOrEqual": "6.19.*"
      },
      {
        "status": "unaffected",
        "version": "7.0",
        "versionType": "original_commit_for_fix",
        "lessThanOrEqual": "*"
      }
    ],
    "programFiles": [
      "drivers/usb/chipidea/udc.c"
    ],
    "defaultStatus": "affected"
  }
]
Related CVEs
CVE-2026-43250

Source reference: /cveMetadata/cveId

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Event
#46278 · Revision 1
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