Tracker / CVE-2024-40913
CVE-2024-40913
High 7.8
In the Linux kernel, the following vulnerability has been resolved: cachefiles: defer exposing anon_fd until after copy_to_user() succeeds After installing the anonymous fd, we can now see it in userland and close it. However, at this point we may not have gotten the reference count of the cache, but we will put it during colse fd, so this may cause a cache UAF. So grab the cache reference count before fd_install(). In addition, by kernel convention, fd is taken over by the user land after fd_install(), and the kernel should not call close_fd() after that, i.e., it should call fd_install() after everything is ready, thus fd_install() is called after copy_to_user() succeeds.
Affected products and versions
| linux | linux_kernel |
|---|---|
| linux | linux_kernel · 5.19 → 6.1.95 |
| linux | linux_kernel · 6.2 → 6.6.35 |
| linux | linux_kernel · 6.7 → 6.9.6 |
Analysis
This page is not indexable yet.Until it carries original analysis — what it actually exposes, how to check in two minutes whether a system was touched, what to do if it was — the page stays noindex. The database decides that, not the template.