misc: nsm: pin the module while the device is open
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 6.12.101, 6.18.42, 7.1.6
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
- Exploitation: none
- Automatable: no
- Technical impact: total
Summary
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.
Timeline
- CVE published
- CISA SSVC assessment
Exploitation: none · Automatable: no · Technical impact: total
- Record last updated
Affected versions
- Linux Linux
From b9873755a6c8ccfce79094c4dce9efa3ecb1a749 · fixed in 1996639f824ce9468395cdb7bcb8f467fa787e77; From b9873755a6c8ccfce79094c4dce9efa3ecb1a749 · fixed in 1da310b94504d42001e9c32c43c5dc105b777e5f; From b9873755a6c8ccfce79094c4dce9efa3ecb1a749 · fixed in 9e9a82d00c3d10129fc310a7547b24a679d5d920; From b9873755a6c8ccfce79094c4dce9efa3ecb1a749 · fixed in 3b231f1e9990f4c21220d0a69733ce2105891ff9
- Linux Linux
6.8
- KernelLinux
From 6.8.0 · fixed in 6.12.101; From 6.13.0 · fixed in 6.18.42; From 6.19.0 · fixed in 7.1.6