Description
In the Linux kernel, the following vulnerability has been resolved: misc: nsm: pin the module while the device is open misc_open() installs a misc driver's file operations with fops_get(), which pins file_operations::owner before replacing the file's f_op. The NSM misc device leaves nsm_dev_fops.owner unset, so opening /dev/nsm does not take a module reference on the nsm driver. If the driver is built as a module, an open file descriptor can therefore survive rmmod of the module that provides its ioctl callbacks. A later ioctl through that descriptor can call into unloaded module text. Set nsm_dev_fops.owner to THIS_MODULE so the misc core holds the module while any /dev/nsm file descriptor is open, matching the lifetime expectation for the installed file operations.
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
b9873755a6c8ccfce79094c4dce9efa3ecb1a749 to < 1996639f824ce9468395cdb7bcb8f467fa787e77affectedb9873755a6c8ccfce79094c4dce9efa3ecb1a749 to < 1da310b94504d42001e9c32c43c5dc105b777e5faffectedb9873755a6c8ccfce79094c4dce9efa3ecb1a749 to < 9e9a82d00c3d10129fc310a7547b24a679d5d920affectedb9873755a6c8ccfce79094c4dce9efa3ecb1a749 to < 3b231f1e9990f4c21220d0a69733ce2105891ff9affected
Linux Linux
Default version status: affected
6.8affected0 to < 6.8unaffected6.12.101 to ≤ 6.12.*unaffected6.18.42 to ≤ 6.18.*unaffected7.1.6 to ≤ 7.1.*unaffected7.2 to ≤ *unaffected