CVE WatchAug 4, 2026

CVE-2023-53360

In the Linux kernel, the following vulnerability has been resolved: NFSv4.2: Rework scratch handling for READ_PLUS (again) I found that th

CVSS

9.8

Critical

EPSS

0.4%

p34

KEV

—

Exploit Today

0-100

Published: Sep 17, 2025 · Last modified: Aug 4, 2026 · CWE-415

EPSS · 30d

0.4%EPSS · 30 days0.4%

2026-08-252026-09-22

Technical description

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.

Official references

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