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CVE-2021-47450— KVM: arm64: Fix host stage-2 PGD refcount

EPSS 0.01% · P3

Affected Version Matrix 6

VendorProductVersion RangeStatus
LinuxLinux1025c8c0c6accfcbdc8f52ca1940160f65cd87d6< b372264c66ef78f2cab44e877fbd765ad6d24c39affected
1025c8c0c6accfcbdc8f52ca1940160f65cd87d6< 1d58a17ef54599506d44c45ac95be27273a4d2b1affected
5.13affected
< 5.13unaffected
5.14.15≤ 5.14.*unaffected
5.15≤ *unaffected
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I. Basic Information for CVE-2021-47450

Vulnerability Information
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Vulnerability Title
KVM: arm64: Fix host stage-2 PGD refcount
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: KVM: arm64: Fix host stage-2 PGD refcount The KVM page-table library refcounts the pages of concatenated stage-2 PGDs individually. However, when running KVM in protected mode, the host's stage-2 PGD is currently managed by EL2 as a single high-order compound page, which can cause the refcount of the tail pages to reach 0 when they shouldn't, hence corrupting the page-table. Fix this by introducing a new hyp_split_page() helper in the EL2 page allocator (matching the kernel's split_page() function), and make use of it from host_s2_zalloc_pages_exact().
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。攻击者利用该漏洞导致页表损坏。
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 1025c8c0c6accfcbdc8f52ca1940160f65cd87d6 ~ b372264c66ef78f2cab44e877fbd765ad6d24c39 -
LinuxLinux 5.13 -

II. Public POCs for CVE-2021-47450

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III. Intelligence Information for CVE-2021-47450

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Other References for CVE-2021-47450 (1)

Same Patch Batch · Linux · 2024-05-22 · 63 CVEs total

CVE-2021-47477comedi: dt9812: fix DMA buffers on stack
CVE-2021-47493ocfs2: fix race between searching chunks and release journal_head from buffer_head
CVE-2021-47495usbnet: sanity check for maxpacket
CVE-2021-47496net/tls: Fix flipped sign in tls_err_abort() calls
CVE-2021-47494cfg80211: fix management registrations locking
CVE-2021-47481RDMA/mlx5: Initialize the ODP xarray when creating an ODP MR
CVE-2021-47482net: batman-adv: fix error handling
CVE-2021-47480scsi: core: Put LLD module refcnt after SCSI device is released
CVE-2021-47478isofs: Fix out of bound access for corrupted isofs image
CVE-2021-47479staging: rtl8712: fix use-after-free in rtl8712_dl_fw
CVE-2021-47483regmap: Fix possible double-free in regcache_rbtree_exit()
CVE-2021-47476comedi: ni_usb6501: fix NULL-deref in command paths
CVE-2021-47475comedi: vmk80xx: fix transfer-buffer overflows
CVE-2021-47474comedi: vmk80xx: fix bulk-buffer overflow
CVE-2021-47473scsi: qla2xxx: Fix a memory leak in an error path of qla2x00_process_els()
CVE-2021-47471drm: mxsfb: Fix NULL pointer dereference crash on unload
CVE-2021-47470mm, slub: fix potential use-after-free in slab_debugfs_fops
CVE-2021-47468isdn: mISDN: Fix sleeping function called from invalid context
CVE-2021-47467kunit: fix reference count leak in kfree_at_end
CVE-2021-47466mm, slub: fix potential memoryleak in kmem_cache_open()

Showing top 20 of 63 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-47450

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