Description
In the Linux kernel, the following vulnerability has been resolved: NFSD: fix nfs4_file access extra count in nfsd4_add_rdaccess_to_wrdeleg In nfsd4_add_rdaccess_to_wrdeleg, if fp->fi_fds[O_RDONLY] is already set by another thread, __nfs4_file_get_access should not be called to increment the nfs4_file access count since that was already done by the thread that added READ access to the file. The extra fi_access count in nfs4_file can prevent the corresponding nfsd_file from being freed. When stopping nfs-server service, these extra access counts trigger a BUG in kmem_cache_destroy() that shows nfsd_file object remaining on __kmem_cache_shutdown. This problem can be reproduced by running the Git project's test suite over NFS.
CVSS breakdown
CVSS 3.1
Attack Vector
Network
Attack Complexity
Low
Privileges Required
None
User Interaction
None
Scope
Unchanged
Confidentiality
None
Integrity
None
Availability
High
Affected products
- Linux / Linuxc07dc84ed67c5a182273171639bacbbb87c12175 – 4584229395d0d65bd517780afe97ffea07cb2c3d
- Linux / Linux8072e34e1387d03102b788677d491e2bcceef6f5 – b81572b073441dfd32213e41857676d0dbff4665
- Linux / Linux8072e34e1387d03102b788677d491e2bcceef6f5 – b48f44f36e6607b2f818560f19deb86b4a9c717b
- Linux / Linux6.18.4 – 6.18.33
- Linux / Linux6.19 – 6.19
- Linux / Linux0 – 6.19
- Linux / Linux6.18.33 – 6.18.*
- Linux / Linux7.0.10 – 7.0.*
- Linux / Linux7.1 – *