GHSA-262V-749M-59X9

Vulnerability from github – Published: 2026-10-06 09:31 – Updated: 2026-10-06 09:31
VLAI
Details

In the Linux kernel, the following vulnerability has been resolved:

dmaengine: mmp_pdma: fix wrong sg length in mmp_pdma_prep_slave_sg()

In mmp_pdma_prep_slave_sg(), for_each_sg() iterates the scatterlist putting each entry into 'sg', but the entry length is read from 'sgl' (the list head) instead of 'sg' (the current entry):

for_each_sg(sgl, sg, sg_len, i) {
    addr = sg_dma_address(sg);
    avail = sg_dma_len(sgl);   /* should be 'sg' */

Consequently 'avail' is always the length of the first entry. For multi-sg lists this causes out-of-bounds reads when a later entry is shorter than the first, and silent data loss when it is longer. Single-sg or uniformly-sized lists happen to mask the issue.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-98298"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-10-06T09:18:20Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\ndmaengine: mmp_pdma: fix wrong sg length in mmp_pdma_prep_slave_sg()\n\nIn mmp_pdma_prep_slave_sg(), for_each_sg() iterates the scatterlist\nputting each entry into \u0027sg\u0027, but the entry length is read from \u0027sgl\u0027\n(the list head) instead of \u0027sg\u0027 (the current entry):\n\n    for_each_sg(sgl, sg, sg_len, i) {\n        addr = sg_dma_address(sg);\n        avail = sg_dma_len(sgl);   /* should be \u0027sg\u0027 */\n\nConsequently \u0027avail\u0027 is always the length of the first entry. For\nmulti-sg lists this causes out-of-bounds reads when a later entry is\nshorter than the first, and silent data loss when it is longer.\nSingle-sg or uniformly-sized lists happen to mask the issue.",
  "id": "GHSA-262v-749m-59x9",
  "modified": "2026-10-06T09:31:34Z",
  "published": "2026-10-06T09:31:34Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-98298"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/075bc7b1d3dde5ed43fbaabbc1a69f09b7fc3a47"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/2148db529f082d6e3ca95413bf943442f4ef30cc"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/4a33886057e6d127555efb022879c583e966acc5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/54ccc01012a240476edf641bf1a2b8bff54fe6ae"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/88a505330eb06128f7ce79a4c5e4832b7601b3d1"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bae65e4925928f77824ca0103122e2ed20ef5802"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d920c07aa6d89ec11afdb6976aafaee9563a5234"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/f448a5f5bd10d792440a1b08cf2e8f311767032d"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}



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