7.5

CVE-2023-53817: crypto: lib/mpi - avoid null pointer deref in mpi_cmp_ui()

Deferred
AliasesUBUNTU-CVE-2023-53817DEBIAN-CVE-2023-53817
Published 09-12-2025Last modified 05-08-2026

Vulnerability summary

CVE-2023-53817 is a high (CVSS 7.5) vulnerability in linux. EPSS estimates a 0.51% chance of exploitation in the next 30 days, higher than 43.4% of scored vulnerabilities.

Priority
Prioritisesevere

Severe, CVSS 7.5 (CVE.org); no exploitation reported by the 5 checked sources; EPSS 1% (FIRST, 03-11-2026)

Source freshness unavailable

How is this decided?
CVSS score
7.5/10
010
High · v3.1 (CVE.org)
EPSS score
0.51%
0%100%
Low · 0.00 pp in 30 days
KEVNot listedNot listed by any tracked catalog.
RansomwareNot flaggedNo ransomware use recorded.
Public exploits0No public exploits recorded

Advisory lineage

Upstream 0 · Downstream 8 · Related 8
SUSE-SU-2026:0962-1SUSE-SU-2026:1041-1SUSE-SU-2026:1078-1SUSE-SU-2026:1081-1SUSE-SU-2026:20667-1SUSE-SU-2026:20720-1

Timeline

  1. 09-12-2025
    PublishedVulnerability first disclosed.
  2. 05-08-2026
    Last modifiedVulnerability information updated.

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()

CVSS metrics

5 scores · 4 sources · 2 versions

EPSS trend

Probability

0.51%

Chance of exploitation in the next 30 days

Percentile

43%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.51% on 04-10-2026

04-10-202603-11-2026

Known exploited

Compare KEV catalogs
CISA KEV

Not in the CISA KEV catalog.

ENISA CNW

Not in the ENISA CNW catalog.

CIRCL

Not in the CIRCL catalog.

Public exploits

0 found

No public exploits indexed.

Weaknesses

CWE · root cause

No weakness data has been published for this record.

Affected systems

Version check

Known conditions: network-reachable, no authentication, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu125 products
  • linuxAll versions (No fix recorded) | < 5.4.0-169.187 | < 5.15.0-94.104
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-awsAll versions (No fix recorded) | < 5.4.0-1116.126 | < 5.15.0-1053.58
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Debian1 product
  • linux< 6.1.55-1 | < 6.5.6-1
Linux1 product
  • linux≥ 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5, < fde791e8a96a64ea7b0ad2440e43586447a209c6 | ≥ 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5, < ae63e84ffda74267bf7277c38415ba38389229a0 | ≥ 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5, < 61f5453e9706e99713825594e0c8f9031485fb5f | ≥ 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5, < 0fc7147c694394f8a8cbc19570c6bc918cac0906 | ≥ 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5, < 67589d247909043e94d2dd5fb590958e0f99d58d | ≥ 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5, < d3ad023a39f1127dcfd331c562673355dc078650 | ≥ 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5, < 12ac013ad7ff0df066451e825801d805095b3776 | ≥ 12f008b6dc5ff1c822fdb2198d20e3dbdc92f3f5, < 9e47a758b70167c9301d2b44d2569f86c7796f2d | 3.7

3 vendors · 127 products

References

12 links
Show all 12 references