CVE-2023-52976: efi: fix potential NULL deref in efi_mem_reserve_persistent
First published: Thu Mar 27 2025(Updated: )
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]
Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67
| Affected Software | Affected Version | How to fix |
|---|---|---|
| Linux Kernel | ||
| Linux Kernel | >=5.1.16<5.4.232 | |
| Linux Kernel | >=5.5<5.10.168 | |
| Linux Kernel | >=5.11<5.15.93 | |
| Linux Kernel | >=5.16<6.1.11 | |
| Linux Kernel | =6.2-rc1 | |
| Linux Kernel | =6.2-rc2 | |
| Linux Kernel | =6.2-rc3 | |
| Linux Kernel | =6.2-rc4 | |
| Linux Kernel | =6.2-rc5 | |
| Linux Kernel | =6.2-rc6 |
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Reference Links
- https://git.kernel.org/stable/c/d92a25627bcdf264183670da73c9a60c0bac327e
- https://git.kernel.org/stable/c/87d4ff18738fd71e7e3c10827c80257da6283697
- https://git.kernel.org/stable/c/d8fc0b5fb3e816a4a8684bcd3ed02cbef0fce23c
- https://git.kernel.org/stable/c/a2e6a9ff89f13666a1c3ff7195612ab949ea9afc
- https://git.kernel.org/stable/c/966d47e1f27c45507c5df82b2a2157e5a4fd3909
Frequently Asked Questions
What is the severity of CVE-2023-52976?
The severity of CVE-2023-52976 is considered moderate since it involves a potential NULL dereference in the Linux kernel.
How do I fix CVE-2023-52976?
To fix CVE-2023-52976, update your Linux kernel to the latest version where this vulnerability has been patched.
What are the potential impacts of CVE-2023-52976?
CVE-2023-52976 could potentially lead to null pointer dereferences, resulting in system crashes or instability.
Which versions of the Linux kernel are affected by CVE-2023-52976?
CVE-2023-52976 affects various versions of the Linux kernel prior to the patch being applied.
Is CVE-2023-52976 being actively exploited?
As of now, there is no public indication that CVE-2023-52976 is being actively exploited in the wild.
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