CVE - CVE-2021-47004

CVE-ID
CVE-2021-47004	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: f2fs: fix to avoid touching checkpointed data in get_victim() In CP disabling mode, there are two issues when using LFS or SSR \| AT_SSR mode to select victim: 1. LFS is set to find source section during GC, the victim should have no checkpointed data, since after GC, section could not be set free for reuse. Previously, we only check valid chpt blocks in current segment rather than section, fix it. 2. SSR \| AT_SSR are set to find target segment for writes which can be fully filled by checkpointed and newly written blocks, we should never select such segment, otherwise it can cause panic or data corruption during allocation, potential case is described as below: a) target segment has 'n' (n < 512) ckpt valid blocks b) GC migrates 'n' valid blocks to other segment (segment is still in dirty list) c) GC migrates '512 - n' blocks to target segment (segment has 'n' cp_vblocks and '512 - n' vblocks) d) If GC selects target segment via {AT,}SSR allocator, however there is no free space in targe segment.
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/105155a8146ddb54c119d8318964eef3859d109d URL:https://git.kernel.org/stable/c/105155a8146ddb54c119d8318964eef3859d109d MISC:https://git.kernel.org/stable/c/1e116f87825f01a6380286472196882746b16f63 URL:https://git.kernel.org/stable/c/1e116f87825f01a6380286472196882746b16f63 MISC:https://git.kernel.org/stable/c/211372b2571520e394b56b431a0705586013b3ff URL:https://git.kernel.org/stable/c/211372b2571520e394b56b431a0705586013b3ff MISC:https://git.kernel.org/stable/c/61461fc921b756ae16e64243f72af2bfc2e620db URL:https://git.kernel.org/stable/c/61461fc921b756ae16e64243f72af2bfc2e620db
Assigning CNA
kernel.org
Date Record Created
20240227	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 (20240227)
Votes (Legacy)

Comments (Legacy)

Proposed (Legacy)
N/A
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