CVE-2023-53360 (GCVE-0-2023-53360)
Vulnerability from cvelistv5
Published
2025-09-17 14:56
Modified
2026-08-05 09:13
Severity ?
9.8 (Critical) - CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:H/I:H/A:H
Summary
In the Linux kernel, the following vulnerability has been resolved: NFSv4.2: Rework scratch handling for READ_PLUS (again) I found that the read code might send multiple requests using the same nfs_pgio_header, but nfs4_proc_read_setup() is only called once. This is how we ended up occasionally double-freeing the scratch buffer, but also means we set a NULL pointer but non-zero length to the xdr scratch buffer. This results in an oops the first time decoding needs to copy something to scratch, which frequently happens when decoding READ_PLUS hole segments. I fix this by moving scratch handling into the pageio read code. I provide a function to allocate scratch space for decoding read replies, and free the scratch buffer when the nfs_pgio_header is freed.
References
Impacted products
Vendor Product Version
Linux Linux Version: 886959f425b6a936a30b82a297ae3aecb3b8230f
Version: fbd2a05f29a95d5b42b294bf47e55a711424965b
Version: fbd2a05f29a95d5b42b294bf47e55a711424965b
Version: fbd2a05f29a95d5b42b294bf47e55a711424965b
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