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Review reviewHigh

CVE-2023-53680

Linux Linux, linux kernel

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[].

CVSS
7.8
EPSS
0.28%
20.2% percentile
CISA KEV
Not listed
Published
2025.10.08
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.28%
Technical severityCVSS 7.8

Vulnerability overview

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[].

Affected product and versions

Product
Linux Linux, linux kernel
Affected versions
>= f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 < 50827896c365e0f6c8b55ed56d444dafd87c92c5, >= f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 < a64160124d5a078be0c380b1e8a0bad2d040d3a1, >= f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 < ffcbcf087581ae68ddc0a21460f7ecd4315bdd0e, >= f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 < f352c41fa718482979e7e6b71b4da2b718e381cc, >= f4f9ef4a1b0a1ca80b152e28e176d69515bdf7e8 < 804d8e0a6e54427268790472781e03bc243f4ee3, >= 4.14, >= 4.14 < 5.10.220, >= 5.11 < 5.15.107, >= 5.16 < 6.1.24, >= 6.2 < 6.2.11, 6.3
Fixed versions
5.10.220, 5.15.107, 6.1.24, 6.2.11

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux Linux, linux kernel and an affected version are present.

  2. 2
    Prioritize

    Combine exploitation signals with asset exposure and business criticality.

  3. 3
    Remediate

    Follow the vendor advisory or supported update path and preserve rollback options.

  4. 4
    Verify

    Recheck the version, service health, access paths, and relevant logs.

Technical data

CVSS vector
CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:H/I:H/A:H
CWE
CWE-787
CVE-2023-53680 — Linux Linux, linux kernel | SECUFOCUS NOW