CVE-2023-52976

efi: fix potential NULL deref in efi_mem_reserve_persistent

State: Published
Severity: 5.5 Medium
Published: Mar 27, 2025
Updated: May 23, 2026
Reserved: Mar 27, 2025

Read the record on cve.org

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]

Scores

CVSS	Score	Vector	Source
3.1	5.5 Medium	CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H	CISA-ADP

Weaknesses

CWE-476 NULL Pointer Dereference

Affected Products

Product	Versions
LinuxLinux	18df7577adae6c6c778bf774b3aebcacbc1fb439 to before d92a25627bcdf264183670da73c9a60c0bac327eAffected 18df7577adae6c6c778bf774b3aebcacbc1fb439 to before 87d4ff18738fd71e7e3c10827c80257da6283697Affected 18df7577adae6c6c778bf774b3aebcacbc1fb439 to before d8fc0b5fb3e816a4a8684bcd3ed02cbef0fce23cAffected 18df7577adae6c6c778bf774b3aebcacbc1fb439 to before a2e6a9ff89f13666a1c3ff7195612ab949ea9afcAffected 18df7577adae6c6c778bf774b3aebcacbc1fb439 to before 966d47e1f27c45507c5df82b2a2157e5a4fd3909Affected b5961ecad7121fec138ebee7d9eba4863f9dc6e7Affected 5.1.16 to before 5.2Affected
LinuxLinux	5.2Affected before 5.2Not affected 5.4.232 through 5.4.Not affected 5.10.168 through 5.10.Not affected 5.15.93 through 5.15.Not affected 6.1.11 through 6.1.Not affected 6.2 and laterNot affected

Product

Versions

LinuxLinux

18df7577adae6c6c778bf774b3aebcacbc1fb439 to before d92a25627bcdf264183670da73c9a60c0bac327eAffected
18df7577adae6c6c778bf774b3aebcacbc1fb439 to before 87d4ff18738fd71e7e3c10827c80257da6283697Affected
18df7577adae6c6c778bf774b3aebcacbc1fb439 to before d8fc0b5fb3e816a4a8684bcd3ed02cbef0fce23cAffected
18df7577adae6c6c778bf774b3aebcacbc1fb439 to before a2e6a9ff89f13666a1c3ff7195612ab949ea9afcAffected
18df7577adae6c6c778bf774b3aebcacbc1fb439 to before 966d47e1f27c45507c5df82b2a2157e5a4fd3909Affected
b5961ecad7121fec138ebee7d9eba4863f9dc6e7Affected
5.1.16 to before 5.2Affected

LinuxLinux

5.2Affected
before 5.2Not affected
5.4.232 through 5.4.*Not affected
5.10.168 through 5.10.*Not affected
5.15.93 through 5.15.*Not affected
6.1.11 through 6.1.*Not affected
6.2 and laterNot affected

References

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