Metrics
Affected Vendors & Products
Thu, 12 Sep 2024 15:15:00 +0000
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First Time appeared |
Linux
Linux linux Kernel |
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Weaknesses | CWE-476 | |
CPEs | cpe:2.3:o:linux:linux_kernel:*:*:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.2:rc1:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.2:rc2:*:*:*:*:*:* cpe:2.3:o:linux:linux_kernel:6.2:rc3:*:*:*:*:*:* |
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Vendors & Products |
Linux
Linux linux Kernel |
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Metrics |
cvssV3_1
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cvssV3_1
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Wed, 11 Sep 2024 13:30:00 +0000
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Metrics |
ssvc
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Wed, 21 Aug 2024 21:30:00 +0000
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References |
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Metrics |
threat_severity
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cvssV3_1
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Wed, 21 Aug 2024 06:30:00 +0000
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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. | |
Title | nfsd: fix handling of cached open files in nfsd4_open codepath | |
References |
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Status: PUBLISHED
Assigner: Linux
Published: 2024-08-21T06:10:50.303Z
Updated: 2024-09-12T17:33:12.921Z
Reserved: 2024-08-21T06:07:11.015Z
Link: CVE-2023-52909
Updated: 2024-09-11T12:42:17.697Z
Status : Analyzed
Published: 2024-08-21T07:15:06.857
Modified: 2024-09-12T14:52:54.573
Link: CVE-2023-52909