CVE-2023-53817

crypto: lib/mpi - avoid null pointer deref in mpi_cmp_ui()

State: Published
Severity: 7.5 High
Published: Dec 9, 2025
Updated: Aug 5, 2026
Reserved: Dec 8, 2025

Description

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()

Scores

CVSS	Score	Vector	Source
3.1	7.5 High	CVSS:3.1/AV:N/AC:L/PR:N/UI:N/S:U/C:N/I:N/A:H	Linux

Weaknesses

The record names no weakness.

Affected Products

Product	Versions
LinuxLinux	12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 to before fde791e8a96a64ea7b0ad2440e43586447a209c6Affected 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 to before ae63e84ffda74267bf7277c38415ba38389229a0Affected 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 to before 61f5453e9706e99713825594e0c8f9031485fb5fAffected 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 to before 0fc7147c694394f8a8cbc19570c6bc918cac0906Affected 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 to before 67589d247909043e94d2dd5fb590958e0f99d58dAffected 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 to before d3ad023a39f1127dcfd331c562673355dc078650Affected 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 to before 12ac013ad7ff0df066451e825801d805095b3776Affected 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 to before 9e47a758b70167c9301d2b44d2569f86c7796f2dAffected
LinuxLinux	3.7Affected before 3.7Not affected 4.14.326 through 4.14.Not affected 4.19.295 through 4.19.Not affected 5.4.257 through 5.4.Not affected 5.10.197 through 5.10.Not affected 5.15.133 through 5.15.Not affected 6.1.55 through 6.1.Not affected 6.5.5 through 6.5.*Not affected 6.6 and laterNot affected

Product

Versions

LinuxLinux

12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 to before fde791e8a96a64ea7b0ad2440e43586447a209c6Affected
12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 to before ae63e84ffda74267bf7277c38415ba38389229a0Affected
12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 to before 61f5453e9706e99713825594e0c8f9031485fb5fAffected
12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 to before 0fc7147c694394f8a8cbc19570c6bc918cac0906Affected
12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 to before 67589d247909043e94d2dd5fb590958e0f99d58dAffected
12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 to before d3ad023a39f1127dcfd331c562673355dc078650Affected
12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 to before 12ac013ad7ff0df066451e825801d805095b3776Affected
12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5 to before 9e47a758b70167c9301d2b44d2569f86c7796f2dAffected

LinuxLinux

3.7Affected
before 3.7Not affected
4.14.326 through 4.14.*Not affected
4.19.295 through 4.19.*Not affected
5.4.257 through 5.4.*Not affected
5.10.197 through 5.10.*Not affected
5.15.133 through 5.15.*Not affected
6.1.55 through 6.1.*Not affected
6.5.5 through 6.5.*Not affected
6.6 and laterNot affected

References

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