- Vulnerability/
- CVE-2024-40935
CVE-2024-40935: cachefiles: flush all requests after setting CACHEFILES_DEAD
First published: Fri Jul 12 2024(Updated: )
In the Linux kernel, the following vulnerability has been resolved: cachefiles: flush all requests after setting CACHEFILES_DEAD In ondemand mode, when the daemon is processing an open request, if the kernel flags the cache as CACHEFILES_DEAD, the cachefiles_daemon_write() will always return -EIO, so the daemon can't pass the copen to the kernel. Then the kernel process that is waiting for the copen triggers a hung_task. Since the DEAD state is irreversible, it can only be exited by closing /dev/cachefiles. Therefore, after calling cachefiles_io_error() to mark the cache as CACHEFILES_DEAD, if in ondemand mode, flush all requests to avoid the above hungtask. We may still be able to read some of the cached data before closing the fd of /dev/cachefiles. Note that this relies on the patch that adds reference counting to the req, otherwise it may UAF.
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| debian/linux | 5.10.223-1 5.10.226-1 6.1.115-1 6.1.119-1 6.11.10-1 6.12.5-1 |
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Reference Links
- https://git.kernel.org/stable/c/320ba9cbca78be79c912143bbba1d1b35ca55cf0
- https://git.kernel.org/stable/c/3bf0b8030296e9ee60d3d4c15849ad9ac0b47081
- https://git.kernel.org/stable/c/85e833cd7243bda7285492b0653c3abb1e2e757b
- https://git.kernel.org/stable/c/e73fac95084839c5178d97e81c6a2051251bdc00
- https://git.kernel.org/linus/85e833cd7243bda7285492b0653c3abb1e2e757b
- https://security-tracker.debian.org/tracker/CVE-2024-40935
- https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2024-40935
- https://nvd.nist.gov/vuln/detail/CVE-2024-40935
- https://launchpad.net/bugs/cve/CVE-2024-40935
- https://ubuntu.com/security/CVE-2024-40935
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