FKIE_CVE-2026-43484

Vulnerability from fkie_nvd - Published: 2026-05-13 16:16 - Updated: 2026-06-17 10:49
Severity
Summary
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.
References
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/0e06cc511c61cff1591e5435a207759adcc76b6d
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/270277c2ab631044867adb1bd2f2433d3892de6e
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/41dce4dae583a8ce06a7ebf4ce704c46a142957c
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/45038e03f15e992c48603fff8c6b1c9be5397ac9
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/901084c51a0a8fb42a3f37d2e9c62083c495f824
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/bb7fc2498c3bb25fa6a91f22f4760005325cfbd5
416baaa9-dc9f-4396-8d5f-8c081fb06d67https://git.kernel.org/stable/c/d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc
Impacted products
Vendor Product Version
To clipboard 

{
  "affected": [
    {
      "affectedData": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "include/linux/mmc/host.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "lessThan": "41dce4dae583a8ce06a7ebf4ce704c46a142957c",
              "status": "affected",
              "version": "6c0cedd1ef9527ef13e66875746570e76a3188a7",
              "versionType": "git"
            },
            {
              "lessThan": "bb7fc2498c3bb25fa6a91f22f4760005325cfbd5",
              "status": "affected",
              "version": "6c0cedd1ef9527ef13e66875746570e76a3188a7",
              "versionType": "git"
            },
            {
              "lessThan": "270277c2ab631044867adb1bd2f2433d3892de6e",
              "status": "affected",
              "version": "6c0cedd1ef9527ef13e66875746570e76a3188a7",
              "versionType": "git"
            },
            {
              "lessThan": "45038e03f15e992c48603fff8c6b1c9be5397ac9",
              "status": "affected",
              "version": "6c0cedd1ef9527ef13e66875746570e76a3188a7",
              "versionType": "git"
            },
            {
              "lessThan": "0e06cc511c61cff1591e5435a207759adcc76b6d",
              "status": "affected",
              "version": "6c0cedd1ef9527ef13e66875746570e76a3188a7",
              "versionType": "git"
            },
            {
              "lessThan": "d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc",
              "status": "affected",
              "version": "6c0cedd1ef9527ef13e66875746570e76a3188a7",
              "versionType": "git"
            },
            {
              "lessThan": "901084c51a0a8fb42a3f37d2e9c62083c495f824",
              "status": "affected",
              "version": "6c0cedd1ef9527ef13e66875746570e76a3188a7",
              "versionType": "git"
            }
          ]
        },
        {
          "defaultStatus": "affected",
          "product": "Linux",
          "programFiles": [
            "include/linux/mmc/host.h"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
            {
              "status": "affected",
              "version": "4.15"
            },
            {
              "lessThan": "4.15",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "5.15.*",
              "status": "unaffected",
              "version": "5.15.203",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.1.*",
              "status": "unaffected",
              "version": "6.1.167",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.6.*",
              "status": "unaffected",
              "version": "6.6.130",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.12.*",
              "status": "unaffected",
              "version": "6.12.78",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.18.*",
              "status": "unaffected",
              "version": "6.18.19",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "6.19.*",
              "status": "unaffected",
              "version": "6.19.9",
              "versionType": "semver"
            },
            {
              "lessThanOrEqual": "*",
              "status": "unaffected",
              "version": "7.0",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67"
    }
  ],
  "cveTags": [],
  "descriptions": [
    {
      "lang": "en",
      "value": "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": "CVE-2026-43484",
  "lastModified": "2026-06-17T10:49:47.733",
  "metrics": {},
  "published": "2026-05-13T16:16:51.623",
  "references": [
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/0e06cc511c61cff1591e5435a207759adcc76b6d"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/270277c2ab631044867adb1bd2f2433d3892de6e"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/41dce4dae583a8ce06a7ebf4ce704c46a142957c"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/45038e03f15e992c48603fff8c6b1c9be5397ac9"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/901084c51a0a8fb42a3f37d2e9c62083c495f824"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/bb7fc2498c3bb25fa6a91f22f4760005325cfbd5"
    },
    {
      "source": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
      "url": "https://git.kernel.org/stable/c/d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc"
    }
  ],
  "sourceIdentifier": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
  "vulnStatus": "Awaiting Analysis"
}


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