CVE-2026-98324

Full vulnerability record from the local CVENow database.

Description

In the Linux kernel, the following vulnerability has been resolved: dmaengine: pxa: fix double counting of the hw descriptors pxad_alloc_desc() was converted from kzalloc(struct_size(sw_desc, hw_desc, nb_hw_desc), GFP_NOWAIT) to kzalloc_flex(), which sets the __counted_by() counter sw_desc->nb_desc itself - but only where the compiler has __builtin_counted_by_ref(), so from gcc 15.1 or clang 22.1 on. The loop below it still increments nb_desc, which makes it come out doubled there and correct elsewhere. nb_desc is what pxad_free_desc() iterates over and what set_updater_desc() indexes from, so set it explicitly and drop the increment. The error path has to lower it to the number of descriptors allocated so far, otherwise pxad_free_desc() would free entries that were never allocated.

Severity

HIGH

CVSS score

7.8 (v3.1)

Vulnerability status

Received

Source identifier

416baaa9-dc9f-4396-8d5f-8c081fb06d67

Published

2026-10-06 09:18:24.573000

Last modified

2026-10-19 10:18:34.593000

View original CVE JSON

{
  "id": "CVE-2026-98324",
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "published": "2026-10-06T09:18:24.573",
  "lastModified": "2026-10-19T10:18:34.593",
  "vulnStatus": "Received",
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: pxa: fix double counting of the hw descriptors\n\npxad_alloc_desc() was converted from\n\n        kzalloc(struct_size(sw_desc, hw_desc, nb_hw_desc), GFP_NOWAIT)\n\nto kzalloc_flex(), which sets the __counted_by() counter sw_desc->nb_desc\nitself - but only where the compiler has __builtin_counted_by_ref(), so\nfrom gcc 15.1 or clang 22.1 on. The loop below it still increments\nnb_desc, which makes it come out doubled there and correct elsewhere.\n\nnb_desc is what pxad_free_desc() iterates over and what\nset_updater_desc() indexes from, so set it explicitly and drop the\nincrement. The error path has to lower it to the number of descriptors\nallocated so far, otherwise pxad_free_desc() would free entries that were\nnever allocated."
    }
  ],
  "affected": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "affectedData": [
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "unaffected",
          "programFiles": [
            "drivers/dma/pxa_dma.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "69050f8d6d075dc01af7a5f2f550a8067510366f",
              "lessThan": "1de93785f32b450e9eae1e4fcfb7d03eb49eb27e",
              "versionType": "git",
              "status": "affected"
            },
            {
              "version": "69050f8d6d075dc01af7a5f2f550a8067510366f",
              "lessThan": "f6504be006aa4bb4bd26285f410a885c17920d65",
              "versionType": "git",
              "status": "affected"
            }
          ]
        },
        {
          "vendor": "Linux",
          "product": "Linux",
          "defaultStatus": "affected",
          "programFiles": [
            "drivers/dma/pxa_dma.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "versions": [
            {
              "version": "7.0",
              "status": "affected"
            },
            {
              "version": "0",
              "lessThan": "7.0",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.2.8",
              "lessThanOrEqual": "7.2.*",
              "versionType": "semver",
              "status": "unaffected"
            },
            {
              "version": "7.3",
              "lessThanOrEqual": "*",
              "versionType": "original_commit_for_fix",
              "status": "unaffected"
            }
          ]
        }
      ]
    }
  ],
  "metrics": {
    "cvssMetricV31": [
      {
        "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "type": "Secondary",
        "cvssData": {
          "version": "3.1",
          "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
          "baseScore": 7.8,
          "baseSeverity": "HIGH",
          "attackVector": "LOCAL",
          "attackComplexity": "LOW",
          "privilegesRequired": "LOW",
          "userInteraction": "NONE",
          "scope": "UNCHANGED",
          "confidentialityImpact": "HIGH",
          "integrityImpact": "HIGH",
          "availabilityImpact": "HIGH"
        },
        "exploitabilityScore": 1.8,
        "impactScore": 5.9
      }
    ]
  },
  "references": [
    {
      "url": "https://git.kernel.org/stable/c/1de93785f32b450e9eae1e4fcfb7d03eb49eb27e",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    },
    {
      "url": "https://git.kernel.org/stable/c/f6504be006aa4bb4bd26285f410a885c17920d65",
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ]
}