GHSA-42P4-9577-4WFH

Vulnerability from github – Published: 2026-05-13 18:30 – Updated: 2026-05-13 18:30
VLAI?
Details

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

mmc: core: Avoid bitfield RMW for claim/retune flags

Move claimed and retune control flags out of the bitfield word to avoid unrelated RMW side effects in asynchronous contexts.

The host->claimed bit shared a word with retune flags. Writes to claimed in __mmc_claim_host() or retune_now in mmc_mq_queue_rq() can overwrite other bits when concurrent updates happen in other contexts, triggering spurious WARN_ON(!host->claimed). Convert claimed, can_retune, retune_now and retune_paused to bool to remove shared-word coupling.

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{
  "affected": [],
  "aliases": [
    "CVE-2026-43484"
  ],
  "database_specific": {
    "cwe_ids": [],
    "github_reviewed": false,
    "github_reviewed_at": null,
    "nvd_published_at": "2026-05-13T16:16:51Z",
    "severity": null
  },
  "details": "In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: core: Avoid bitfield RMW for claim/retune flags\n\nMove claimed and retune control flags out of the bitfield word to\navoid unrelated RMW side effects in asynchronous contexts.\n\nThe host-\u003eclaimed bit shared a word with retune flags. Writes to claimed\nin __mmc_claim_host() or retune_now in mmc_mq_queue_rq() can overwrite\nother bits when concurrent updates happen in other contexts, triggering\nspurious WARN_ON(!host-\u003eclaimed). Convert claimed, can_retune,\nretune_now and retune_paused to bool to remove shared-word coupling.",
  "id": "GHSA-42p4-9577-4wfh",
  "modified": "2026-05-13T18:30:57Z",
  "published": "2026-05-13T18:30:57Z",
  "references": [
    {
      "type": "ADVISORY",
      "url": "https://nvd.nist.gov/vuln/detail/CVE-2026-43484"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/0e06cc511c61cff1591e5435a207759adcc76b6d"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/270277c2ab631044867adb1bd2f2433d3892de6e"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/41dce4dae583a8ce06a7ebf4ce704c46a142957c"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/45038e03f15e992c48603fff8c6b1c9be5397ac9"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/901084c51a0a8fb42a3f37d2e9c62083c495f824"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/bb7fc2498c3bb25fa6a91f22f4760005325cfbd5"
    },
    {
      "type": "WEB",
      "url": "https://git.kernel.org/stable/c/d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc"
    }
  ],
  "schema_version": "1.4.0",
  "severity": []
}


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