CVE - CVE-2024-50017

CVE-ID
CVE-2024-50017	Learn more at National Vulnerability Database (NVD) • CVSS Severity Rating • Fix Information • Vulnerable Software Versions • SCAP Mappings • CPE Information
Description
In the Linux kernel, the following vulnerability has been resolved: x86/mm/ident_map: Use gbpages only where full GB page should be mapped. When ident_pud_init() uses only GB pages to create identity maps, large ranges of addresses not actually requested can be included in the resulting table; a 4K request will map a full GB. This can include a lot of extra address space past that requested, including areas marked reserved by the BIOS. That allows processor speculation into reserved regions, that on UV systems can cause system halts. Only use GB pages when map creation requests include the full GB page of space. Fall back to using smaller 2M pages when only portions of a GB page are included in the request. No attempt is made to coalesce mapping requests. If a request requires a map entry at the 2M (pmd) level, subsequent mapping requests within the same 1G region will also be at the pmd level, even if adjacent or overlapping such requests could have been combined to map a full GB page. Existing usage starts with larger regions and then adds smaller regions, so this should not have any great consequence.
References
Note: References are provided for the convenience of the reader to help distinguish between vulnerabilities. The list is not intended to be complete.
MISC:https://git.kernel.org/stable/c/a23823098ab2c277c14fc110b97d8d5c83597195 URL:https://git.kernel.org/stable/c/a23823098ab2c277c14fc110b97d8d5c83597195 MISC:https://git.kernel.org/stable/c/cc31744a294584a36bf764a0ffa3255a8e69f036 URL:https://git.kernel.org/stable/c/cc31744a294584a36bf764a0ffa3255a8e69f036 MISC:https://git.kernel.org/stable/c/d80a99892f7a992d103138fa4636b2c33abd6740 URL:https://git.kernel.org/stable/c/d80a99892f7a992d103138fa4636b2c33abd6740
Assigning CNA
kernel.org
Date Record Created
20241021	Disclaimer: The record creation date may reflect when the CVE ID was allocated or reserved, and does not necessarily indicate when this vulnerability was discovered, shared with the affected vendor, publicly disclosed, or updated in CVE.
Phase (Legacy)
Assigned (20241021)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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