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CVE-2021-47004— f2fs: fix to avoid touching checkpointed data in get_victim()

EPSS 0.02% · P6
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I. Basic Information for CVE-2021-47004

Vulnerability Information
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Vulnerability Title
f2fs: fix to avoid touching checkpointed data in get_victim()
Source: NVD (National Vulnerability Database)
Vulnerability 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.
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Title
Linux kernel 安全漏洞
Source: CNNVD (China National Vulnerability Database)
Vulnerability Description
Linux kernel是美国Linux基金会的开源操作系统Linux所使用的内核。 Linux kernel 存在安全漏洞。目前尚无此漏洞的相关信息，请随时关注CNNVD或厂商公告。
Source: CNNVD (China National Vulnerability Database)
CVSS Information
N/A
Source: CNNVD (China National Vulnerability Database)
Vulnerability Type
N/A
Source: CNNVD (China National Vulnerability Database)

Affected Products

VendorProductAffected VersionsCPESubscribe
LinuxLinux 4354994f097d068a894aa1a0860da54571df3582 ~ 105155a8146ddb54c119d8318964eef3859d109d -
LinuxLinux 4.20 -

II. Public POCs for CVE-2021-47004

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III. Intelligence Information for CVE-2021-47004

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Same Patch Batch · Linux · 2024-02-28 · 86 CVEs total

CVE-2021-46995can: mcp251xfd: mcp251xfd_probe(): fix an error pointer dereference in probe
CVE-2021-46998ethernet:enic: Fix a use after free bug in enic_hard_start_xmit
CVE-2021-46999sctp: do asoc update earlier in sctp_sf_do_dupcook_a
CVE-2021-47001xprtrdma: Fix cwnd update ordering
CVE-2021-47003dmaengine: idxd: Fix potential null dereference on pointer status
CVE-2021-47005PCI: endpoint: Fix NULL pointer dereference for ->get_features()
CVE-2021-47007f2fs: fix panic during f2fs_resize_fs()
CVE-2021-47006ARM: 9064/1: hw_breakpoint: Do not directly check the event's overflow_handler hook
CVE-2021-47009KEYS: trusted: Fix memory leak on object td
CVE-2021-47002SUNRPC: Fix null pointer dereference in svc_rqst_free()
CVE-2021-46997arm64: entry: always set GIC_PRIO_PSR_I_SET during entry
CVE-2021-46996netfilter: nftables: Fix a memleak from userdata error path in new objects
CVE-2021-46994can: mcp251x: fix resume from sleep before interface was brought up
CVE-2021-46992netfilter: nftables: avoid overflows in nft_hash_buckets()
CVE-2021-46993sched: Fix out-of-bound access in uclamp
CVE-2021-46990powerpc/64s: Fix crashes when toggling entry flush barrier
CVE-2021-46991i40e: Fix use-after-free in i40e_client_subtask()
CVE-2021-46989hfsplus: prevent corruption in shrinking truncate
CVE-2021-46987btrfs: fix deadlock when cloning inline extents and using qgroups
CVE-2021-46988userfaultfd: release page in error path to avoid BUG_ON

Showing top 20 of 86 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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