CVE - CVE-2024-35872

CVE-ID
CVE-2024-35872	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/secretmem: fix GUP-fast succeeding on secretmem folios folio_is_secretmem() currently relies on secretmem folios being LRU folios, to save some cycles. However, folios might reside in a folio batch without the LRU flag set, or temporarily have their LRU flag cleared. Consequently, the LRU flag is unreliable for this purpose. In particular, this is the case when secretmem_fault() allocates a fresh page and calls filemap_add_folio()->folio_add_lru(). The folio might be added to the per-cpu folio batch and won't get the LRU flag set until the batch was drained using e.g., lru_add_drain(). Consequently, folio_is_secretmem() might not detect secretmem folios and GUP-fast can succeed in grabbing a secretmem folio, crashing the kernel when we would later try reading/writing to the folio, because the folio has been unmapped from the directmap. Fix it by removing that unreliable check.
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/201e4aaf405dfd1308da54448654053004c579b5 URL:https://git.kernel.org/stable/c/201e4aaf405dfd1308da54448654053004c579b5 MISC:https://git.kernel.org/stable/c/43fad1d0284de30159661d0badfc3cbaf7e6f8f8 URL:https://git.kernel.org/stable/c/43fad1d0284de30159661d0badfc3cbaf7e6f8f8 MISC:https://git.kernel.org/stable/c/65291dcfcf8936e1b23cfd7718fdfde7cfaf7706 URL:https://git.kernel.org/stable/c/65291dcfcf8936e1b23cfd7718fdfde7cfaf7706 MISC:https://git.kernel.org/stable/c/6564b014af92b677c1f07c44d7f5b595d589cf6e URL:https://git.kernel.org/stable/c/6564b014af92b677c1f07c44d7f5b595d589cf6e MISC:https://git.kernel.org/stable/c/9c2b4b657739ecda38e3b383354a29566955ac48 URL:https://git.kernel.org/stable/c/9c2b4b657739ecda38e3b383354a29566955ac48
Assigning CNA
kernel.org
Date Record Created
20240517	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 (20240517)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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