GHSA-4W7V-GF5R-FHPH

Vulnerability from github – Published: 2026-08-15 06:32 – Updated: 2026-08-17 06:33
VLAI
Details

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

md/raid10: reset read_slot when reusing r10bio for discard

put_all_bios() always drops devs[i].bio, but it only drops devs[i].repl_bio when r10_bio->read_slot < 0. If discard reuses an r10bio that was previously used for a read, read_slot can still be non-negative, and discard cleanup can skip bio_put() on repl_bio.

Reset read_slot to -1 when preparing an r10bio for discard so the replacement bio is always released correctly.

Severity
9.8 (Critical)
CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
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{
  "affected": [],
  "aliases": [
    "CVE-2026-74376"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-08-15T06:22:39Z",
    "severity": "CRITICAL"
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmd/raid10: reset read_slot when reusing r10bio for discard\n\nput_all_bios() always drops devs[i].bio, but it only drops\ndevs[i].repl_bio when r10_bio-\u003eread_slot \u003c 0. If discard reuses an\nr10bio that was previously used for a read, read_slot can still be\nnon-negative, and discard cleanup can skip bio_put() on repl_bio.\n\nReset read_slot to -1 when preparing an r10bio for discard so the\nreplacement bio is always released correctly.",
  "id": "GHSA-4w7v-gf5r-fhph",
  "modified": "2026-08-17T06:33:41Z",
  "published": "2026-08-15T06:32:31Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-74376"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/3cb2a606ce4902eceabe68338df0653312f861f8"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/561c9711e4f545d6464a023168bdee03b00fa945"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/6b8a26af065ddc93de2aa5c9f0df98dce9723442"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/742e4afd247d9c972695227716b03d432a7e1d26"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/b7313f23ea5a79b199a007bfad64a866cc2c22e7"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/ce3030e92f14362880055de5fe3c258971118853"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/eb04e3e9c14ed15914f5fd2eae8b6435f54f095f"
    }
  ],
  "schema_version": "1.4.0",
  "severity": [
    {
      "score": "CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H",
      "type": "CVSS_V3"
    }
  ]
}



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