CVE-2023-53360 (GCVE-0-2023-53360)

Vulnerability from cvelistv5 – Published: 2025-09-17 14:56 – Updated: 2026-01-14 18:53
VLAI?
Title
NFSv4.2: Rework scratch handling for READ_PLUS (again)
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.
Severity ?
5.5 (Medium)
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H
CWE
Assigner
References
Impacted products
Vendor Product Version
Linux Linux Affected: 886959f425b6a936a30b82a297ae3aecb3b8230f , < adac9f0ddd2b291c7ce41f549fdb27a13616cff5 (git)
Affected: fbd2a05f29a95d5b42b294bf47e55a711424965b , < a2f4cb206bd94b3f4a7bb05fcdce9525283b5681 (git)
Affected: fbd2a05f29a95d5b42b294bf47e55a711424965b , < ae5d5672f1db711e91db6f52df5cb16ecd8f5692 (git)
Affected: fbd2a05f29a95d5b42b294bf47e55a711424965b , < 303a78052091c81e9003915c521fdca1c7e117af (git)
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    Linux Linux Affected: 6.4
Unaffected: 0 , < 6.4 (semver)
Unaffected: 6.4.16 , ≤ 6.4.* (semver)
Unaffected: 6.5.3 , ≤ 6.5.* (semver)
Unaffected: 6.6 , ≤ * (original_commit_for_fix)
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  • Confirmed: The vulnerability has been validated from an analyst's perspective.
  • Published Proof of Concept: A public proof of concept is available for this vulnerability.
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  • Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.



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