CVE - CVE-2024-47674

CVE-ID
CVE-2024-47674	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: mm: avoid leaving partial pfn mappings around in error case As Jann points out, PFN mappings are special, because unlike normal memory mappings, there is no lifetime information associated with the mapping - it is just a raw mapping of PFNs with no reference counting of a 'struct page'. That's all very much intentional, but it does mean that it's easy to mess up the cleanup in case of errors. Yes, a failed mmap() will always eventually clean up any partial mappings, but without any explicit lifetime in the page table mapping itself, it's very easy to do the error handling in the wrong order. In particular, it's easy to mistakenly free the physical backing store before the page tables are actually cleaned up and (temporarily) have stale dangling PTE entries. To make this situation less error-prone, just make sure that any partial pfn mapping is torn down early, before any other error handling.
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/65d0db500d7c07f0f76fc24a4d837791c4862cd2 URL:https://git.kernel.org/stable/c/65d0db500d7c07f0f76fc24a4d837791c4862cd2 MISC:https://git.kernel.org/stable/c/79a61cc3fc0466ad2b7b89618a6157785f0293b3 URL:https://git.kernel.org/stable/c/79a61cc3fc0466ad2b7b89618a6157785f0293b3 MISC:https://git.kernel.org/stable/c/954fd4c81f22c4b6ba65379a81fd252971bf4ef3 URL:https://git.kernel.org/stable/c/954fd4c81f22c4b6ba65379a81fd252971bf4ef3 MISC:https://git.kernel.org/stable/c/a95a24fcaee1b892e47d5e6dcc403f713874ee80 URL:https://git.kernel.org/stable/c/a95a24fcaee1b892e47d5e6dcc403f713874ee80
Assigning CNA
kernel.org
Date Record Created
20240930	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 (20240930)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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