Bug 2355514 (CVE-2023-52976)

Summary: CVE-2023-52976 kernel: efi: fix potential NULL deref in efi_mem_reserve_persistent
Product: [Other] Security Response Reporter: OSIDB Bzimport <bzimport>
Component: vulnerabilityAssignee: Product Security DevOps Team <prodsec-dev>
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Priority: low    
Version: unspecifiedCC: dfreiber, drow, jburrell, vkumar
Target Milestone: ---Keywords: Security
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Hardware: All   
OS: Linux   
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A flaw was found in the EFI module in the Linux kernel. A NULL pointer dereference can be triggered due to a missing check of the return value of the memremap function, causing a crash and resulting in a denial of service.
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Description OSIDB Bzimport 2025-03-27 17:05:06 UTC 
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]
Comment 1 Robb Gatica 2025-03-27 20:16:53 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025032704-CVE-2023-52976-eda3@gregkh/T
Comment 5 Avinash Hanwate 2025-03-28 04:32:11 UTC 
Upstream advisory:
https://lore.kernel.org/linux-cve-announce/2025032704-CVE-2023-52976-eda3@gregkh/T