CVE-2026-89440 (GCVE-0-2026-89440)
Vulnerability from cvelistv5
Published
2026-09-11 19:43
Modified
2026-10-19 08:46
Severity ?
7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: mmc: via-sdmmc: stop card-detect handling on probe failure request_irq() registers the SD card-detect interrupt and the probe enables it before mmc_add_host() runs. If mmc_add_host() fails, the error path only unmaps the registers and returns: the interrupt stays registered, so the handler keeps running against the host once it is freed. via_sdc_isr() dereferences sdhost and its MMIO base and schedules carddet_work, which via_sdc_card_detect() also runs against freed memory through its container_of() dereference. Add a probe-error path that disables and frees the interrupt and cancels carddet_work before unmapping. carddet_work can re-enable the device interrupt via via_reset_pcictrl(), which restores PCIINTCTRL, so mask it again after cancelling the work. This issue was found by an in-house static analysis tool and confirmed by manual code review.
References
Impacted products
Vendor Product Version
Linux Linux Version: 63400da6cd37a9793c19bb6aed7131b58b975a04
Version: 0959cc1685eb19774300d43ef25e318b457b156b
Version: ba91b413983a9235792523c6b9f7ba2586c4d75d
Version: e4e46fb61e3bb4628170810d3f2b996b709b90d9
Version: e4e46fb61e3bb4628170810d3f2b996b709b90d9
Version: e4e46fb61e3bb4628170810d3f2b996b709b90d9
Version: e4e46fb61e3bb4628170810d3f2b996b709b90d9
Version: e4e46fb61e3bb4628170810d3f2b996b709b90d9
Version: 076bcd2c93e16b05c10564e299d6e5d26a766d00
Version: 12b8e81b77c05c658efd9cde3585bbd65ae39b59
Version: 95025a8dd0ec015872f6c16473fe04d6264e68ca
Version: f59ef2a47a228e51322ad76752a55a8917c56e38
Version: 0ec94795114edc7e24ec71849dce42bfa61dafa3
Version: 5.10.163   ≤
Version: 5.15.86   ≤
Version: 6.1.2   ≤
Version: 4.9.337   ≤
Version: 4.14.303   ≤
Version: 4.19.270   ≤
Version: 5.4.229   ≤
Version: 6.0.16   ≤
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{
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      "descriptions": [
        {
          "lang": "en",
          "value": "In the Linux kernel, the following vulnerability has been resolved:\n\nmmc: via-sdmmc: stop card-detect handling on probe failure\n\nrequest_irq() registers the SD card-detect interrupt and the probe enables\nit before mmc_add_host() runs. If mmc_add_host() fails, the error path only\nunmaps the registers and returns: the interrupt stays registered, so the\nhandler keeps running against the host once it is freed. via_sdc_isr()\ndereferences sdhost and its MMIO base and schedules carddet_work, which\nvia_sdc_card_detect() also runs against freed memory through its\ncontainer_of() dereference.\n\nAdd a probe-error path that disables and frees the interrupt and cancels\ncarddet_work before unmapping. carddet_work can re-enable the device\ninterrupt via via_reset_pcictrl(), which restores PCIINTCTRL, so mask it\nagain after cancelling the work.\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 leftover IRQ use-after-free is in the VIA VT9530 PCI SD/MMC host probe path (via_sd_probe enabling via_sdc_isr before mmc_add_host) on systems that already have this onboard/PCI reader; it is not reached by network packets or USB hotplug.\nAC:L - The driver arms the shared card-detect IRQ before mmc_add_host(); a failed add leaves via_sdc_isr registered against freed sdhost indefinitely, so a local attacker who induces device_add failure (memory pressure/reprobe) and reclaims the host slab does not depend on an uncontrolled race.\nPR:L - An unprivileged local user on a machine with this PCI reader can be present when probe fails and then spray the heap while the dangling shared IRQ fires; capability-gated PCI sysfs unbind is not required for the UAF itself, so PR:L is the higher-severity defensible bar.\nUI:N - No victim action such as inserting an SD card, mounting media, or opening a file is required; after failed probe the leftover ISR and carddet_work run from hardware or shared interrupts without another user\u0027s involvement.\nS:U - The use-after-free corrupts kernel heap and IRQ/workqueue state inside the host OS; this is standard in-kernel memory corruption, not a VM escape, IOMMU/DMA isolation bypass, or other cross-authority breakout.\nC:H - via_sdc_isr spin_locks and dereferences the freed via_crdr_mmc_host (MMIO bases and status registers) and may queue carddet_work that recovers the same object via container_of(), a kernel UAF that enables arbitrary disclosure via slab reuse.\nI:H - The same UAF lets a reclaimed host object supply lock, MMIO, and work pointers used for MMIO writes, work scheduling, and via_reset_pcictrl, enabling heap spraying and control-flow hijack rather than a crash-only outcome.\nA:H - IRQ-context dereference of freed sdhost after iounmap and devm mmc_free_host causes a kernel oops or panic even without full exploitation, so availability impact is High."
            }
          ]
        }
      ],
      "providerMetadata": {
        "dateUpdated": "2026-10-19T08:46:49.770Z",
        "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
        "shortName": "Linux"
      },
      "references": [
        {
          "url": "https://git.kernel.org/stable/c/5bb5327b92aae17e91c7228953c350a6ee3c94e8"
        },
        {
          "url": "https://git.kernel.org/stable/c/d045596706d1b25d38af4a79980b017639fea9d1"
        },
        {
          "url": "https://git.kernel.org/stable/c/806409f12fdb14c9e4c56a64494c9b75f356cd49"
        },
        {
          "url": "https://git.kernel.org/stable/c/dde5b9c91e9fc64e54a2f186d3ae95868b4dbb02"
        },
        {
          "url": "https://git.kernel.org/stable/c/efe7f25dd27e35063477b4b0e7eed3675669fd99"
        },
        {
          "url": "https://git.kernel.org/stable/c/2550f89589caad7402d618d7dffc038582c94b6b"
        },
        {
          "url": "https://git.kernel.org/stable/c/c2b8a624911999399cc14822fec3e35032b3cee4"
        },
        {
          "url": "https://git.kernel.org/stable/c/088eaa92fcebaa6b957ccf9635afdf39643a577d"
        }
      ],
      "title": "mmc: via-sdmmc: stop card-detect handling on probe failure",
      "x_generator": {
        "engine": "bippy-1.2.0"
      }
    }
  },
  "cveMetadata": {
    "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67",
    "assignerShortName": "Linux",
    "cveId": "CVE-2026-89440",
    "datePublished": "2026-09-11T19:43:09.402Z",
    "dateReserved": "2026-09-11T19:38:34.703Z",
    "dateUpdated": "2026-10-19T08:46:49.770Z",
    "state": "PUBLISHED"
  },
  "dataType": "CVE_RECORD",
  "dataVersion": "5.2"
}


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