CVE-2023-53360
NFSv4.2: Rework scratch handling for READ_PLUS (again)
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.
INFO
Published Date :
Sept. 17, 2025, 3:15 p.m.
Last Modified :
Sept. 17, 2025, 3:15 p.m.
Remotely Exploit :
No
Source :
416baaa9-dc9f-4396-8d5f-8c081fb06d67
Solution
- Update the Linux kernel to the latest version.
- Apply relevant patches for NFSv4.2 scratch handling.
- Verify scratch buffer allocation and freeing logic.
- Ensure proper handling of READ_PLUS hole segments.
References to Advisories, Solutions, and Tools
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CVE-2023-53360.
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While CVE identifies
specific instances of vulnerabilities, CWE categorizes the common flaws or
weaknesses that can lead to vulnerabilities. CVE-2023-53360 is
associated with the following CWEs:
Common Attack Pattern Enumeration and Classification (CAPEC)
Common Attack Pattern Enumeration and Classification
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stores attack patterns, which are descriptions of the common attributes and
approaches employed by adversaries to exploit the CVE-2023-53360
weaknesses.
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New CVE Received by 416baaa9-dc9f-4396-8d5f-8c081fb06d67
Sep. 17, 2025
Action Type Old Value New Value Added 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. Added Reference https://git.kernel.org/stable/c/303a78052091c81e9003915c521fdca1c7e117af Added Reference https://git.kernel.org/stable/c/a2f4cb206bd94b3f4a7bb05fcdce9525283b5681 Added Reference https://git.kernel.org/stable/c/adac9f0ddd2b291c7ce41f549fdb27a13616cff5 Added Reference https://git.kernel.org/stable/c/ae5d5672f1db711e91db6f52df5cb16ecd8f5692