{"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":"2026-09-14T11:59:51.359Z"},"containers":{"cna":{"providerMetadata":{"orgId":"416baaa9-dc9f-4396-8d5f-8c081fb06d67","shortName":"Linux","dateUpdated":"2026-09-14T11:59:51.359Z"},"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-rc1","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-rc1"},{"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"}}}}