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Review reviewHigh

CVE-2023-53817

Linux

In the Linux kernel, the following vulnerability has been resolved: crypto: lib/mpi - avoid null pointer deref in mpi_cmp_ui() During NVMeTCP Authentication a controller can trigger a kernel oops by specifying the 8192 bit Diffie Hellman group and passing a correctly sized, but zeroed Diffie Hellamn value. mpi_cmp_ui() was detecting this if the second parameter was 0, but 1 is passed from dh_is_pubkey_valid(). This causes the null pointer u->d to be dereferenced towards the end of mpi_cmp_ui()

CVSS
7.5
EPSS
0.47%
38.2% percentile
CISA KEV
Not listed
Published
2025.12.09
PRIORITY ASSESSMENT

Review review

The CVSS severity warrants an early asset and exposure review.

Known exploitationNot established by KEV
Exploit probability0.47%
Technical severityCVSS 7.5

Vulnerability overview

In the Linux kernel, the following vulnerability has been resolved: crypto: lib/mpi - avoid null pointer deref in mpi_cmp_ui() During NVMeTCP Authentication a controller can trigger a kernel oops by specifying the 8192 bit Diffie Hellman group and passing a correctly sized, but zeroed Diffie Hellamn value. mpi_cmp_ui() was detecting this if the second parameter was 0, but 1 is passed from dh_is_pubkey_valid(). This causes the null pointer u->d to be dereferenced towards the end of mpi_cmp_ui()

Affected product and versions

Product
Linux
Affected versions
>= 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 < fde791e8a96a64ea7b0ad2440e43586447a209c6, >= 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 < ae63e84ffda74267bf7277c38415ba38389229a0, >= 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 < 61f5453e9706e99713825594e0c8f9031485fb5f, >= 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 < 0fc7147c694394f8a8cbc19570c6bc918cac0906, >= 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 < 67589d247909043e94d2dd5fb590958e0f99d58d, >= 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 < d3ad023a39f1127dcfd331c562673355dc078650, >= 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 < 12ac013ad7ff0df066451e825801d805095b3776, >= 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 < 9e47a758b70167c9301d2b44d2569f86c7796f2d, >= 3.7
Fixed versions
No verified fixed-version field is available yet

Recommended response sequence

Confirm exposure before applying a vendor-supported change.

Full remediation guide
  1. 1
    Identify

    Confirm that Linux 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:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H
CWE
Not available
CVE-2023-53817 — Linux | SECUFOCUS NOW