CVE-2026-43484 (GCVE-0-2026-43484)

Vulnerability from cvelistv5 – Published: 2026-05-13 15:08 – Updated: 2026-05-13 15:08
VLAI?
Title
mmc: core: Avoid bitfield RMW for claim/retune flags
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.
Severity ?
No CVSS data available.
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 6c0cedd1ef9527ef13e66875746570e76a3188a7 , < 41dce4dae583a8ce06a7ebf4ce704c46a142957c (git)
Affected: 6c0cedd1ef9527ef13e66875746570e76a3188a7 , < bb7fc2498c3bb25fa6a91f22f4760005325cfbd5 (git)
Affected: 6c0cedd1ef9527ef13e66875746570e76a3188a7 , < 270277c2ab631044867adb1bd2f2433d3892de6e (git)
Affected: 6c0cedd1ef9527ef13e66875746570e76a3188a7 , < 45038e03f15e992c48603fff8c6b1c9be5397ac9 (git)
Affected: 6c0cedd1ef9527ef13e66875746570e76a3188a7 , < 0e06cc511c61cff1591e5435a207759adcc76b6d (git)
Affected: 6c0cedd1ef9527ef13e66875746570e76a3188a7 , < d3a3caf44c8ec26f5d63dc17c1c7242effa60ebc (git)
Affected: 6c0cedd1ef9527ef13e66875746570e76a3188a7 , < 901084c51a0a8fb42a3f37d2e9c62083c495f824 (git)
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Linux Linux Affected: 4.15
Unaffected: 0 , < 4.15 (semver)
Unaffected: 5.15.203 , ≤ 5.15.* (semver)
Unaffected: 6.1.167 , ≤ 6.1.* (semver)
Unaffected: 6.6.130 , ≤ 6.6.* (semver)
Unaffected: 6.12.78 , ≤ 6.12.* (semver)
Unaffected: 6.18.19 , ≤ 6.18.* (semver)
Unaffected: 6.19.9 , ≤ 6.19.* (semver)
Unaffected: 7.0 , ≤ * (original_commit_for_fix)
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{
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            "include/linux/mmc/host.h"
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          "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."
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-05-13T15:08:30.919Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
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          "url": "https://git.kernel.org/stable/c/901084c51a0a8fb42a3f37d2e9c62083c495f824"
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      "title": "mmc: core: Avoid bitfield RMW for claim/retune flags",
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    "dateReserved": "2026-05-01T14:12:56.012Z",
    "dateUpdated": "2026-05-13T15:08:30.919Z",
    "state": "PUBLISHED"
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  }
}


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Forecast uses a logistic model when the trend is rising, or an exponential decay model when the trend is falling. Fitted via linearized least squares.

Sightings

Author Source Type Date Other

Nomenclature

  • Seen: The vulnerability was mentioned, discussed, or observed by the user.
  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
  • Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
  • Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
  • Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
  • Not confirmed: The user expressed doubt about the validity of the vulnerability.
  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



Detection rules are retrieved from Rulezet.