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CVE-2026-89441 (GCVE-0-2026-89441)

Vulnerability from cvelistv5 – Published: 2026-09-11 19:43 – Updated: 2026-09-13 06:29
VLAI
Title
mmc: via-sdmmc: cancel card-detect work on remove
Summary
In the Linux kernel, the following vulnerability has been resolved: mmc: via-sdmmc: cancel card-detect work on remove Disabling the device interrupt and freeing the IRQ prevents new card-detect work from being queued, but carddet_work already queued by the handler can still run after via_sd_remove() returns. via_sdc_card_detect() recovers the host through container_of() and dereferences its MMIO base; once remove() returns the host can be freed, so that work would touch freed memory. Cancel carddet_work after freeing the IRQ and before cancelling finish_bh_work, which the card-detect handler can also queue. carddet_work can re-enable the interrupt through via_reset_pcictrl(); mask it again afterwards. This issue was found by an in-house static analysis tool and confirmed by manual code review.
Severity
7.8 (High)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Assigner
References
Impacted products
Vendor Product Version CPE status
Linux Linux Affected: f0bf7f61b8405224bc52fc9a3ccd167a68126e00 , < f7ff3027ef004a331ef911a4886f12bc2e996037 (git)
Affected: f0bf7f61b8405224bc52fc9a3ccd167a68126e00 , < eaca730c6f5e3609df62a0469fb789235a93d276 (git)
Affected: f0bf7f61b8405224bc52fc9a3ccd167a68126e00 , < 57e5d877f898d5e5c9d672a77bb6bdd24f0d9bf5 (git)
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Linux Linux Affected: 2.6.31
Unaffected: 0 , < 2.6.31 (semver)
Unaffected: 6.18.50 , ≤ 6.18.* (semver)
Unaffected: 7.2.4 , ≤ 7.2.* (semver)
Unaffected: 7.3-rc1 , ≤ * (original_commit_for_fix)
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{
  "containers": {
    "cna": {
      "affected": [
        {
          "defaultStatus": "unaffected",
          "product": "Linux",
          "programFiles": [
            "drivers/mmc/host/via-sdmmc.c"
          ],
          "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git",
          "vendor": "Linux",
          "versions": [
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              "status": "affected",
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              "versionType": "git"
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          "vendor": "Linux",
          "versions": [
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              "status": "unaffected",
              "version": "0",
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              "versionType": "semver"
            },
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              "version": "7.2.4",
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              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
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      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
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                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "2.6.31",
                  "vulnerable": true
                },
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                  "versionEndExcluding": "7.2.4",
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                  "vulnerable": true
                },
                {
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                  "versionEndExcluding": "7.3-rc1",
                  "versionStartIncluding": "2.6.31",
                  "vulnerable": true
                }
              ],
              "negate": false,
              "operator": "OR"
            }
          ]
        }
      ],
      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: via-sdmmc: cancel card-detect work on remove\n\nDisabling the device interrupt and freeing the IRQ prevents new card-detect\nwork from being queued, but carddet_work already queued by the handler can\nstill run after via_sd_remove() returns. via_sdc_card_detect() recovers the\nhost through container_of() and dereferences its MMIO base; once remove()\nreturns the host can be freed, so that work would touch freed memory.\n\nCancel carddet_work after freeing the IRQ and before cancelling\nfinish_bh_work, which the card-detect handler can also queue. carddet_work\ncan re-enable the interrupt through via_reset_pcictrl(); mask it again\nafterwards.\n\nThis issue was found by an in-house static analysis tool and confirmed by\nmanual code review."
        }
      ],
      "metrics": [
        {
          "cvssV3_1": {
            "baseScore": 7.8,
            "baseSeverity": "HIGH",
            "vectorString": "CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H",
            "version": "3.1"
          },
          "scenarios": [
            {
              "lang": "en",
              "value": "AV:L - The UAF is reached from via_sd_remove() on the VIA VT9530 PCI SD/MMC host when unbind, rmmod, or PCI hot-remove leaves carddet_work pending; no network, Bluetooth, or USB hotplug path enters this teardown.\nAC:L - CIR IRQ queues carddet_work and via_sdc_card_detect() sleeps in via_reset_pcictrl while the attacker retries PCI unbind/rebind, so both sides of the missing cancel_work_sync race are attacker-controlled and retryable; such UAFs score AC:L.\nPR:L - Per CNA driver-removal UAF precedent, including sibling CVE-2026-89440 on this same via-sdmmc driver, an unprivileged local user on a machine with this PCI reader can spray the freed host while teardown proceeds; init-namespace root is not required.\nUI:N - No victim action such as mounting media or opening a file is required; the attacker queues carddet_work (or uses in-flight CIR work) and coordinates with driver removal themselves.\nS:U - The use-after-free corrupts the host kernel\u0027s via_crdr_mmc_host/mmc_host heap object within the same security authority; it is not a VM escape, IOMMU/DMA isolation bypass, or sandbox breakout.\nC:H - via_sdc_card_detect() recovers the freed via_crdr_mmc_host via container_of() and dereferences its MMIO bases, lock, and mrq; this kernel heap UAF enables arbitrary read via slab reuse.\nI:H - The dangling worker performs MMIO writes (DMA soft-reset, via_reset_pcictrl), may queue finish_bh_work, and can re-enable PCIINTCTRL after free_irq, yielding heap-spray write and control-flow hijack primitives.\nA:H - Use-after-free of sdhost after iounmap and devm mmc_free_host causes a kernel oops or panic even when not fully exploited, so availability impact is High."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-09-13T06:29:23.396Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/f7ff3027ef004a331ef911a4886f12bc2e996037"
        },
        {
          "url": "https://git.kernel.org/stable/c/eaca730c6f5e3609df62a0469fb789235a93d276"
        },
        {
          "url": "https://git.kernel.org/stable/c/57e5d877f898d5e5c9d672a77bb6bdd24f0d9bf5"
        }
      ],
      "title": "mmc: via-sdmmc: cancel card-detect work on remove",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89441",
    "datePublished": "2026-09-11T19:43:10.083Z",
    "dateReserved": "2026-09-11T19:38:34.703Z",
    "dateUpdated": "2026-09-13T06:29:23.396Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2",
  "vulnerability-lookup:meta": {
    "epss": {
      "cve": "CVE-2026-89441",
      "date": "2026-09-15",
      "epss": "0.00127",
      "percentile": "0.02693"
    },
    "nvd": "{\"cve\":{\"id\":\"CVE-2026-89441\",\"sourceIdentifier\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"published\":\"2026-09-11T20:19:24.487\",\"lastModified\":\"2026-09-13T07:17:08.650\",\"vulnStatus\":\"Received\",\"cveTags\":[],\"descriptions\":[{\"lang\":\"en\",\"value\":\"In the Linux kernel, the following vulnerability has been resolved:\\n\\nmmc: via-sdmmc: cancel card-detect work on remove\\n\\nDisabling the device interrupt and freeing the IRQ prevents new card-detect\\nwork from being queued, but carddet_work already queued by the handler can\\nstill run after via_sd_remove() returns. via_sdc_card_detect() recovers the\\nhost through container_of() and dereferences its MMIO base; once remove()\\nreturns the host can be freed, so that work would touch freed memory.\\n\\nCancel carddet_work after freeing the IRQ and before cancelling\\nfinish_bh_work, which the card-detect handler can also queue. carddet_work\\ncan re-enable the interrupt through via_reset_pcictrl(); mask it again\\nafterwards.\\n\\nThis issue was found by an in-house static analysis tool and confirmed by\\nmanual code review.\"}],\"affected\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"affectedData\":[{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"unaffected\",\"programFiles\":[\"drivers/mmc/host/via-sdmmc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"f0bf7f61b8405224bc52fc9a3ccd167a68126e00\",\"lessThan\":\"f7ff3027ef004a331ef911a4886f12bc2e996037\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f0bf7f61b8405224bc52fc9a3ccd167a68126e00\",\"lessThan\":\"eaca730c6f5e3609df62a0469fb789235a93d276\",\"versionType\":\"git\",\"status\":\"affected\"},{\"version\":\"f0bf7f61b8405224bc52fc9a3ccd167a68126e00\",\"lessThan\":\"57e5d877f898d5e5c9d672a77bb6bdd24f0d9bf5\",\"versionType\":\"git\",\"status\":\"affected\"}]},{\"vendor\":\"Linux\",\"product\":\"Linux\",\"defaultStatus\":\"affected\",\"programFiles\":[\"drivers/mmc/host/via-sdmmc.c\"],\"repo\":\"https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git\",\"versions\":[{\"version\":\"2.6.31\",\"status\":\"affected\"},{\"version\":\"0\",\"lessThan\":\"2.6.31\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"6.18.50\",\"lessThanOrEqual\":\"6.18.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.2.4\",\"lessThanOrEqual\":\"7.2.*\",\"versionType\":\"semver\",\"status\":\"unaffected\"},{\"version\":\"7.3-rc1\",\"lessThanOrEqual\":\"*\",\"versionType\":\"original_commit_for_fix\",\"status\":\"unaffected\"}]}]}],\"metrics\":{\"cvssMetricV31\":[{\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\",\"type\":\"Secondary\",\"cvssData\":{\"version\":\"3.1\",\"vectorString\":\"CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H\",\"baseScore\":7.8,\"baseSeverity\":\"HIGH\",\"attackVector\":\"LOCAL\",\"attackComplexity\":\"LOW\",\"privilegesRequired\":\"LOW\",\"userInteraction\":\"NONE\",\"scope\":\"UNCHANGED\",\"confidentialityImpact\":\"HIGH\",\"integrityImpact\":\"HIGH\",\"availabilityImpact\":\"HIGH\"},\"exploitabilityScore\":1.8,\"impactScore\":5.9}]},\"references\":[{\"url\":\"https://git.kernel.org/stable/c/57e5d877f898d5e5c9d672a77bb6bdd24f0d9bf5\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/eaca730c6f5e3609df62a0469fb789235a93d276\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"},{\"url\":\"https://git.kernel.org/stable/c/f7ff3027ef004a331ef911a4886f12bc2e996037\",\"source\":\"416baaa9-dc9f-4396-8d5f-8c081fb06d67\"}]}}",
    "redhat_vex": {
      "aggregate_severity": "Moderate",
      "current_release_date": "2026-09-14T21:44:13+00:00",
      "cve": "CVE-2026-89441",
      "id": "CVE-2026-89441",
      "initial_release_date": "2026-09-11T00:00:00+00:00",
      "product_status:known_affected": "276",
      "source": "Red Hat CSAF VEX",
      "status": "final",
      "title": "kernel: mmc: via-sdmmc: cancel card-detect work on remove",
      "url": "https://security.access.redhat.com/data/csaf/v2/vex/2026/cve-2026-89441.json",
      "version": "3"
    },
    "suse_vex": {
      "aggregate_severity": "moderate",
      "current_release_date": "2026-09-15T00:59:22Z",
      "cve": "CVE-2026-89441",
      "id": "CVE-2026-89441",
      "initial_release_date": "2026-09-12T16:28:25Z",
      "product_status:known_affected": "353",
      "source": "SUSE CSAF VEX",
      "status": "interim",
      "title": "SUSE CVE CVE-2026-89441",
      "url": "https://ftp.suse.com/pub/projects/security/csaf-vex/cve-2026-89441.json",
      "version": "4"
    }
  }
}



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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

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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.


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