{ "dataType": "CVE_RECORD", "dataVersion": "5.2", "cveMetadata": { "cveId": "CVE-2026-89440", "assignerOrgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "state": "PUBLISHED", "assignerShortName": "Linux", "dateReserved": "2026-09-11T19:38:34.703Z", "datePublished": "2026-09-11T19:43:09.402Z", "dateUpdated": "2026-10-19T08:46:49.770Z" }, "containers": { "cna": { "providerMetadata": { "orgId": "416baaa9-dc9f-4396-8d5f-8c081fb06d67", "shortName": "Linux", "dateUpdated": "2026-10-19T08:46:49.770Z" }, "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": { "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 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's 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." } ] } ], "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": "63400da6cd37a9793c19bb6aed7131b58b975a04", "lessThan": "5bb5327b92aae17e91c7228953c350a6ee3c94e8", "status": "affected", "versionType": "git" }, { "version": "0959cc1685eb19774300d43ef25e318b457b156b", "lessThan": "d045596706d1b25d38af4a79980b017639fea9d1", "status": "affected", "versionType": "git" }, { "version": "ba91b413983a9235792523c6b9f7ba2586c4d75d", "lessThan": "806409f12fdb14c9e4c56a64494c9b75f356cd49", "status": "affected", "versionType": "git" }, { "version": "e4e46fb61e3bb4628170810d3f2b996b709b90d9", "lessThan": "dde5b9c91e9fc64e54a2f186d3ae95868b4dbb02", "status": "affected", "versionType": "git" }, { "version": "e4e46fb61e3bb4628170810d3f2b996b709b90d9", "lessThan": "efe7f25dd27e35063477b4b0e7eed3675669fd99", "status": "affected", "versionType": "git" }, { "version": "e4e46fb61e3bb4628170810d3f2b996b709b90d9", "lessThan": "2550f89589caad7402d618d7dffc038582c94b6b", "status": "affected", "versionType": "git" }, { "version": "e4e46fb61e3bb4628170810d3f2b996b709b90d9", "lessThan": "c2b8a624911999399cc14822fec3e35032b3cee4", "status": "affected", "versionType": "git" }, { "version": "e4e46fb61e3bb4628170810d3f2b996b709b90d9", "lessThan": "088eaa92fcebaa6b957ccf9635afdf39643a577d", "status": "affected", "versionType": "git" }, { "version": "076bcd2c93e16b05c10564e299d6e5d26a766d00", "status": "affected", "versionType": "git" }, { "version": "12b8e81b77c05c658efd9cde3585bbd65ae39b59", "status": "affected", "versionType": "git" }, { "version": "95025a8dd0ec015872f6c16473fe04d6264e68ca", "status": "affected", "versionType": "git" }, { "version": "f59ef2a47a228e51322ad76752a55a8917c56e38", "status": "affected", "versionType": "git" }, { "version": "0ec94795114edc7e24ec71849dce42bfa61dafa3", "status": "affected", "versionType": "git" }, { "version": "5.10.163", "lessThan": "5.10.270", "status": "affected", "versionType": "semver" }, { "version": "5.15.86", "lessThan": "5.15.221", "status": "affected", "versionType": "semver" }, { "version": "6.1.2", "lessThan": "6.1.188", "status": "affected", "versionType": "semver" }, { "version": "4.9.337", "lessThan": "4.10", "status": "affected", "versionType": "semver" }, { "version": "4.14.303", "lessThan": "4.15", "status": "affected", "versionType": "semver" }, { "version": "4.19.270", "lessThan": "4.20", "status": "affected", "versionType": "semver" }, { "version": "5.4.229", "lessThan": "5.5", "status": "affected", "versionType": "semver" }, { "version": "6.0.16", "lessThan": "6.1", "status": "affected", "versionType": "semver" } ] }, { "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": "6.2", "status": "affected" }, { "version": "0", "lessThan": "6.2", "status": "unaffected", "versionType": "semver" }, { "version": "5.10.270", "lessThanOrEqual": "5.10.*", "status": "unaffected", "versionType": "semver" }, { "version": "5.15.221", "lessThanOrEqual": "5.15.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.1.188", "lessThanOrEqual": "6.1.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.6.157", "lessThanOrEqual": "6.6.*", "status": "unaffected", "versionType": "semver" }, { "version": "6.12.109", "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": "5.10.163", "versionEndExcluding": "5.10.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.15.86", "versionEndExcluding": "5.15.221" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.1.2", "versionEndExcluding": "6.1.188" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.6.157" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.12.109" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "6.18.50" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.2.4" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.2", "versionEndExcluding": "7.3" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.9.337" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.14.303" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "4.19.270" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "5.4.229" }, { "vulnerable": true, "criteria": "cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:*", "versionStartIncluding": "6.0.16" } ] } ] } ], "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" } } } }