CVE-2023-52909 Vulnerability Details

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CVE-2023-52909 Metadata Quick Info

CVE Published: 21/08/2024 | CVE Updated: 04/11/2024 | CVE Year: 2023
Source: Linux | Vendor: Linux | Product: Linux
Status : PUBLISHED

CVE-2023-52909 Description

In the Linux kernel, the following vulnerability has been resolved: nfsd: fix handling of cached open files in nfsd4_open codepath Commit fb70bf124b05 ("NFSD: Instantiate a struct file when creating a regular NFSv4 file") added the ability to cache an open fd over a compound. There are a couple of problems with the way this currently works: It\'s racy, as a newly-created nfsd_file can end up with its PENDING bit cleared while the nf is hashed, and the nf_file pointer is still zeroed out. Other tasks can find it in this state and they expect to see a valid nf_file, and can oops if nf_file is NULL. Also, there is no guarantee that we\'ll end up creating a new nfsd_file if one is already in the hash. If an extant entry is in the hash with a valid nf_file, nfs4_get_vfs_file will clobber its nf_file pointer with the value of op_file and the old nf_file will leak. Fix both issues by making a new nfsd_file_acquirei_opened variant that takes an optional file pointer. If one is present when this is called, we\'ll take a new reference to it instead of trying to open the file. If the nfsd_file already has a valid nf_file, we\'ll just ignore the optional file and pass the nfsd_file back as-is. Also rework the tracepoints a bit to allow for an "opened" variant and don\'t try to avoid counting acquisitions in the case where we already have a cached open file.

Metrics

CVSS Version: 3.1 | Base Score: n/a
Vector: n/a

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Weakness Enumeration (CWE)

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Source: Linux

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Source: NVD (National Vulnerability Database).