{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89441", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.703Z", "datePublished": "2026-09-11T19:43:10.083Z", "dateUpdated": "2026-10-21T12:47:28.538Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-21T12:47:28.538Z" }, "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": { "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" }, "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's 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." } ] } ], "affected": [ { "product": "Linux", "vendor": "Linux", "defaultStatus": "unaffected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/mmc/host/via-sdmmc.c" ], "versions": [ { "version": "f0bf7f61b8405224bc52fc9a3ccd167a68126e00", "lessThan": "55d71c70f11d9f92c7d2653774001e98cb509deb", "status": "affected", "versionType": "git" }, { "version": "f0bf7f61b8405224bc52fc9a3ccd167a68126e00", "lessThan": "0a3c70191868fb007c03ff79693ad4e4b3fdcbb8", "status": "affected", "versionType": "git" }, { "version": "f0bf7f61b8405224bc52fc9a3ccd167a68126e00", "lessThan": "f7ff3027ef004a331ef911a4886f12bc2e996037", "status": "affected", "versionType": "git" }, { "version": "f0bf7f61b8405224bc52fc9a3ccd167a68126e00", "lessThan": "eaca730c6f5e3609df62a0469fb789235a93d276", "status": "affected", "versionType": "git" }, { "version": "f0bf7f61b8405224bc52fc9a3ccd167a68126e00", "lessThan": "57e5d877f898d5e5c9d672a77bb6bdd24f0d9bf5", "status": "affected", "versionType": "git" } ] }, { "product": "Linux", "vendor": "Linux", "defaultStatus": "affected", "repo": "https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git", "programFiles": [ "drivers/mmc/host/via-sdmmc.c" ], "versions": [ { "version": "2.6.31", "status": "affected" }, { "version": "0", "lessThan": "2.6.31", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.160", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.112", "lessThanOrEqual": "6.12.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.18.50", "lessThanOrEqual": "6.18.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.2.4", "lessThanOrEqual": "7.2.*", "status": "unaffected", "versionType": "semver" }, { "version": "7.3", "lessThanOrEqual": "*", "status": "unaffected", "versionType": "original_commit_for_fix" } ] } ], "cpeApplicability": [ { "nodes": [ { "operator": "OR", "negate": false, "cpeMatch": [ { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.6.160" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.12.112" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "2.6.31", "versionEndExcluding": "7.3" } ] } ] } ], "references": [ { "url": "https://git.kernel.org/stable/c/55d71c70f11d9f92c7d2653774001e98cb509deb" }, { "url": "https://git.kernel.org/stable/c/0a3c70191868fb007c03ff79693ad4e4b3fdcbb8" }, { "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" } }, "adp": [ { "metrics": [ { "other": { "type": "ssvc", "content": { "id": "CVE-2026-89441", "role": "CISA Coordinator", "options": [ { "Exploitation": "none" }, { "Automatable": "no" }, { "Technical Impact": "total" } ], "version": "2.0.3", "timestamp": "2026-10-16T19:22:13.294951Z" } } } ], "title": "CISA ADP Vulnrichment", "providerMetadata": { "orgId": "134c704f-9b21-4f2e-91b3-4a467353bcc0", "shortName": "CISA-ADP", "dateUpdated": "2026-10-16T19:26:38.639Z" } } ] } }