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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": [
            {
              "lessThan": "f7ff3027ef004a331ef911a4886f12bc2e996037",
              "status": "affected",
              "version": "f0bf7f61b8405224bc52fc9a3ccd167a68126e00",
              "versionType": "git"
            },
            {
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              "status": "affected",
              "version": "f0bf7f61b8405224bc52fc9a3ccd167a68126e00",
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            },
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          ],
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          "vendor": "Linux",
          "versions": [
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              "status": "affected",
              "version": "2.6.31"
            },
            {
              "lessThan": "2.6.31",
              "status": "unaffected",
              "version": "0",
              "versionType": "semver"
            },
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              "versionType": "semver"
            },
            {
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              "status": "unaffected",
              "version": "7.2.4",
              "versionType": "semver"
            },
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              "status": "unaffected",
              "version": "7.3-rc1",
              "versionType": "original_commit_for_fix"
            }
          ]
        }
      ],
      "cpeApplicability": [
        {
          "nodes": [
            {
              "cpeMatch": [
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "6.18.50",
                  "versionStartIncluding": "2.6.31",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "versionEndExcluding": "7.2.4",
                  "versionStartIncluding": "2.6.31",
                  "vulnerable": true
                },
                {
                  "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*",
                  "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": "2026-09-16",
      "epss": "0.00127",
      "percentile": "0.02718"
    },
    "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

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.


Related by attack behaviour

Vulnerabilities whose description is nearest to this one in the vector space of the CIRCL/vulnerability-attack-technique-biencoder model. This is a similarity search over the bi-encoder space (plain cosine), not a classification, and it has no measured accuracy.