Buffer overflow in Linux
CVE-2023-53680
In the Linux kernel, the following vulnerability has been resolved: NFSD: Avoid calling OPDESC() with ops->opnum == OP_ILLEGAL OPDESC() simply indexes into nfsd4_ops[] by the op's operation number, without range checking that value. It assumes callers are careful to avoid calling it with an out-of-bounds opnum value. nfsd4_decode_compound() is not so careful, and can invoke OPDESC() with opnum set to OP_ILLEGAL, which is 10044 -- well beyond the end of nfsd4_ops[].
Vulnerability class: Buffer Overflow
EPSS: 0.001 (4.1th percentile) — read the EPSS interpretation.
CVSS v3 metric
CVSS v3 base score 7.5 (High). Vector: CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H.
Affected products
- Linux — versions f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8, 4.14, 0
- Linux Linux_kernel — versions 6.3
Weakness classification (CWE)
Public proof-of-concept exploits
References
Frequently asked questions
- What is CVE-2023-53680?
- CVE-2023-53680 is a high-severity vulnerability in Linux, classified under Out-of-bounds Write. CVSS score: 7.5/10. Published 2025-10-07.
- How severe is CVE-2023-53680?
- High severity. CVSS v3 base score is 7.5 out of 10.
- Is CVE-2023-53680 known to be exploited?
- 1 public proof-of-concept repositories are indexed. Not currently listed in the CISA KEV catalog.