CVE-2024-40935
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…
Does this matter?
High impact if exploited, but EPSS currently rates exploitation as unlikely (0.26%). Schedule it in the normal patch cycle and watch for a rise in EPSS or a public exploit.
Description
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.
- CVSS 3.1
- 7.8 HIGHCVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
- EPSS
- 0.26% probability · 18th percentile
- CISA KEV
- Not listed
- Weakness
- CWE-416
- Affected
- linux/linux kernel
- Source
- 416baaa9-dc9f-4396-8d5f-8c081fb06d67
References
- https://git.kernel.org/stable/c/320ba9cbca78be79c912143bbba1d1b35ca55cf0Patch
- https://git.kernel.org/stable/c/3bf0b8030296e9ee60d3d4c15849ad9ac0b47081Patch
- https://git.kernel.org/stable/c/85e833cd7243bda7285492b0653c3abb1e2e757bPatch
- https://git.kernel.org/stable/c/e73fac95084839c5178d97e81c6a2051251bdc00Patch
- https://git.kernel.org/stable/c/320ba9cbca78be79c912143bbba1d1b35ca55cf0Patch
- https://git.kernel.org/stable/c/3bf0b8030296e9ee60d3d4c15849ad9ac0b47081Patch
- https://git.kernel.org/stable/c/85e833cd7243bda7285492b0653c3abb1e2e757bPatch
- https://git.kernel.org/stable/c/e73fac95084839c5178d97e81c6a2051251bdc00Patch
- https://lists.debian.org/debian-lts-announce/2025/01/msg00001.html
Source: NVD record, EPSS from FIRST.org, KEV from CISA. Refreshed daily.