5.5

CVE-2023-52976: efi: fix potential NULL deref in efi_mem_reserve_persistent

Modified
AliasesUBUNTU-CVE-2023-52976DEBIAN-CVE-2023-52976
Published 27-03-2025Last modified 23-05-2026

Vulnerability summary

CVE-2023-52976 is a medium (CVSS 5.5) NULL Pointer Dereference vulnerability in linux. EPSS estimates a 0.28% chance of exploitation in the next 30 days, higher than 20.6% of scored vulnerabilities.

Priority
Routine

Not severe (CVSS 5.5, local access); no exploitation reported by the 5 checked sources

Source freshness unavailable

How is this decided?
CVSS score
5.5/10
010
Medium · v3.1 (CVE.org)
EPSS score
0.28%
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 5 · Related 4
RHSA-2024:2394SUSE-SU-2025:1176-1SUSE-SU-2025:1183-1SUSE-SU-2025:1195-1SUSE-SU-2025:1241-1

Timeline

  1. 27-03-2025
    PublishedVulnerability first disclosed.
  2. 23-05-2026
    Last modifiedVulnerability information updated.

Description

In the Linux kernel, the following vulnerability has been resolved: efi: fix potential NULL deref in efi_mem_reserve_persistent When iterating on a linked list, a result of memremap is dereferenced without checking it for NULL. This patch adds a check that falls back on allocating a new page in case memremap doesn't succeed. Found by Linux Verification Center (linuxtesting.org) with SVACE. [ardb: return -ENOMEM instead of breaking out of the loop]

CVSS metrics

4 scores · 4 sources · 1 version

EPSS trend

Probability

0.28%

Chance of exploitation in the next 30 days

Percentile

21%

Versus all other CVEs

30-day change

No change 0.00 pp

From 0.28% 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

Affected systems

Version check

Known conditions: local access, low-privilege account, no user interaction (CVSS vector). Other conditions: not stated in public data.

Ubuntu109 products
  • linux< 5.4.0-149.166 | < 5.15.0-72.79
  • linux-allwinner-5.19All versions (No fix recorded)
  • linux-aws< 5.4.0-1102.110 | < 5.15.0-1036.40
  • linux-aws-5.0All versions (No fix recorded)
  • linux-aws-5.11All versions (No fix recorded)
Linux2 products
  • linux≥ 18df7577adae6c6c778bf774b3aebcacbc1fb439, < d92a25627bcdf264183670da73c9a60c0bac327e | ≥ 18df7577adae6c6c778bf774b3aebcacbc1fb439, < 87d4ff18738fd71e7e3c10827c80257da6283697 | ≥ 18df7577adae6c6c778bf774b3aebcacbc1fb439, < d8fc0b5fb3e816a4a8684bcd3ed02cbef0fce23c | ≥ 18df7577adae6c6c778bf774b3aebcacbc1fb439, < a2e6a9ff89f13666a1c3ff7195612ab949ea9afc | ≥ 18df7577adae6c6c778bf774b3aebcacbc1fb439, < 966d47e1f27c45507c5df82b2a2157e5a4fd3909 | b5961ecad7121fec138ebee7d9eba4863f9dc6e7 | ≥ 5.1.16, < 5.2 | 5.2
  • linux_kernel≥ 5.1.16, < 5.4.232 | ≥ 5.5, < 5.10.168 | ≥ 5.11, < 5.15.93 | ≥ 5.16, < 6.1.11 | 6.2:rc1 | 6.2:rc2 | 6.2:rc3 | 6.2:rc4 | 6.2:rc5 | 6.2:rc6
Debian1 product
  • linux< 6.1.11-1

3 vendors · 112 products

References

9 links