Linux Kernel up to 5.18.10 fscache_invalidate state issue

Summaryinfo

A vulnerability classified as problematic was found in Linux Kernel up to 5.18.10. This impacts the function fscache_invalidate. Such manipulation leads to state issue. This vulnerability is documented as CVE-2022-49655. The attack needs to be performed locally. There is not any exploit available. Upgrading the affected component is advised.

Detailsinfo

A vulnerability, which was classified as problematic, has been found in Linux Kernel up to 5.18.10. Affected by this issue is the function fscache_invalidate. The manipulation with an unknown input leads to a state issue vulnerability. Using CWE to declare the problem leads to CWE-371. The impact remains unknown. CVE summarizes:

In the Linux kernel, the following vulnerability has been resolved: fscache: Fix invalidation/lookup race If an NFS file is opened for writing and closed, fscache_invalidate() will be asked to invalidate the file - however, if the cookie is in the LOOKING_UP state (or the CREATING state), then request to invalidate doesn't get recorded for fscache_cookie_state_machine() to do something with. Fix this by making __fscache_invalidate() set a flag if it sees the cookie is in the LOOKING_UP state to indicate that we need to go to invalidation. Note that this requires a count on the n_accesses counter for the state machine, which that will release when it's done. fscache_cookie_state_machine() then shifts to the INVALIDATING state if it sees the flag. Without this, an nfs file can get corrupted if it gets modified locally and then read locally as the cache contents may not get updated.

The advisory is shared for download at git.kernel.org. This vulnerability is handled as CVE-2022-49655 since 02/26/2025. The exploitation is known to be difficult. The attack needs to be approached locally. There are known technical details, but no exploit is available.

Upgrading to version 5.18.11 eliminates this vulnerability. Applying the patch b1ae9f617f8a5c848d9205b8e228c6f0d1af754b/85e4ea1049c70fb99de5c6057e835d151fb647da is able to eliminate this problem. The bugfix is ready for download at git.kernel.org. The best possible mitigation is suggested to be upgrading to the latest version.

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Productinfo

Type

• Operating System

Vendor

• Linux

Name

• Kernel

Version

• 5.18.0
• 5.18.1
• 5.18.2
• 5.18.3
• 5.18.4
• 5.18.5
• 5.18.6
• 5.18.7
• 5.18.8
• 5.18.9
• 5.18.10

License

• open-source

Website

• Vendor: https://www.kernel.org/

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