CVE-2022-48829
NFSD: Fix NFSv3 SETATTR/CREATE's handling of large file sizes
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Description
In the Linux kernel, the following vulnerability has been resolved: NFSD: Fix NFSv3 SETATTR/CREATE's handling of large file sizes iattr::ia_size is a loff_t, so these NFSv3 procedures must be careful to deal with incoming client size values that are larger than s64_max without corrupting the value. Silently capping the value results in storing a different value than the client passed in which is unexpected behavior, so remove the min_t() check in decode_sattr3(). Note that RFC 1813 permits only the WRITE procedure to return NFS3ERR_FBIG. We believe that NFSv3 reference implementations also return NFS3ERR_FBIG when ia_size is too large.
Affected
Our own answer: ranges merged, affected separated from platform-only, with confidence and review flags.
Remediation
No guide yetNo remediation guidance has been written for this CVE yet. What the record does show:
Patch and advisory references
- https://git.kernel.org/stable/c/37f2d2cd8eadddbbd9c7bda327a9393399b2f89b
- https://git.kernel.org/stable/c/72c14aed6838b5d90b4dd926b6a339b34bb02e08
- https://git.kernel.org/stable/c/a231ae6bb50e7c0a9e9efd7b0d10687f1d71b3a3
- https://git.kernel.org/stable/c/a648fdeb7c0e17177a2280344d015dba3fbe3314
- https://git.kernel.org/stable/c/aa9051ddb4b378bd22e72a67bc77b9fc1482c5f0
References (7)
SSVC — Action Prioritization
SSVC signals action urgency (what to patch first), separate from CVSS which measures severity.
CVSS
- Attack Vector
- LOCAL
- Complexity
- LOW
- Privileges
- LOW
- User Interaction
- NONE
- Scope
- UNCHANGED
- Confidentiality
- NONE
- Integrity
- NONE
- Availability
- HIGH
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