CVE-2026-89440

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.

Affected Software

VendorProductVersion RangeStatus
LinuxLinuxe4e46fb61e3bb4628170810d3f2b996b709b90d9 < efe7f25dd27e35063477b4b0e7eed3675669fd99affected
LinuxLinuxe4e46fb61e3bb4628170810d3f2b996b709b90d9 < 2550f89589caad7402d618d7dffc038582c94b6baffected
LinuxLinuxe4e46fb61e3bb4628170810d3f2b996b709b90d9 < c2b8a624911999399cc14822fec3e35032b3cee4affected
LinuxLinuxe4e46fb61e3bb4628170810d3f2b996b709b90d9 < 088eaa92fcebaa6b957ccf9635afdf39643a577daffected
LinuxLinux076bcd2c93e16b05c10564e299d6e5d26a766d00affected
LinuxLinux12b8e81b77c05c658efd9cde3585bbd65ae39b59affected
LinuxLinux95025a8dd0ec015872f6c16473fe04d6264e68caaffected
LinuxLinuxf59ef2a47a228e51322ad76752a55a8917c56e38affected
LinuxLinux63400da6cd37a9793c19bb6aed7131b58b975a04affected
LinuxLinux0959cc1685eb19774300d43ef25e318b457b156baffected
LinuxLinux0ec94795114edc7e24ec71849dce42bfa61dafa3affected
LinuxLinuxba91b413983a9235792523c6b9f7ba2586c4d75daffected
LinuxLinux4.9.337 < 4.10affected
LinuxLinux4.14.303 < 4.15affected
LinuxLinux4.19.270 < 4.20affected
LinuxLinux5.4.229 < 5.5affected
LinuxLinux5.10.163 < 5.11affected
LinuxLinux5.15.86 < 5.16affected
LinuxLinux6.0.16 < 6.1affected
LinuxLinux6.1.2 < 6.2affected
LinuxLinux6.2affected
LinuxLinux0 < 6.2unaffected
LinuxLinux6.12.109 <= 6.12.*unaffected
LinuxLinux6.18.50 <= 6.18.*unaffected
LinuxLinux7.2.4 <= 7.2.*unaffected
LinuxLinux7.3-rc1 <= *unaffected

Weaknesses

References