Goal Reached Thanks to every supporter — we hit 100%!

Goal: 1000 CNY · Raised: 1110 CNY

100%
Buy Us a Coffee

CVE-2021-47461— userfaultfd: fix a race between writeprotect and exit_mmap()

EPSS 0.02% · P6

Affected Version Matrix 8

VendorProductVersion RangeStatus
LinuxLinux63b2d4174c4ad1f40b48d7138e71bcb564c1fe03< 3cda4bfffd4f755645577aaa9e96a606657b4525affected
63b2d4174c4ad1f40b48d7138e71bcb564c1fe03< 149958ecd0627a9f1e9c678c25c665400054cd6aaffected
63b2d4174c4ad1f40b48d7138e71bcb564c1fe03< cb185d5f1ebf900f4ae3bf84cee212e6dd035acaaffected
5.7affected
< 5.7unaffected
5.10.76≤ 5.10.*unaffected
5.14.15≤ 5.14.*unaffected
5.15≤ *unaffected
Get alerts for future matching vulnerabilitiesLog in to subscribe

I. Basic Information for CVE-2021-47461

Vulnerability Information
Have questions about the vulnerability? See if Shenlong's analysis helps!
View Shenlong Deep Dive ↗

Although we use advanced large model technology, its output may still contain inaccurate or outdated information.Shenlong tries to ensure data accuracy, but please verify and judge based on the actual situation.

Vulnerability Title
userfaultfd: fix a race between writeprotect and exit_mmap()
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: userfaultfd: fix a race between writeprotect and exit_mmap() A race is possible when a process exits, its VMAs are removed by exit_mmap() and at the same time userfaultfd_writeprotect() is called. The race was detected by KASAN on a development kernel, but it appears to be possible on vanilla kernels as well. Use mmget_not_zero() to prevent the race as done in other userfaultfd operations.
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，该漏洞源于writeprotect 和 exit_mmap() 之间存在竞争。
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 63b2d4174c4ad1f40b48d7138e71bcb564c1fe03 ~ 3cda4bfffd4f755645577aaa9e96a606657b4525 -
LinuxLinux 5.7 -

II. Public POCs for CVE-2021-47461

#POC DescriptionSource LinkShenlong Link
AI-Generated POCPremium

No public POC found.

Login to generate AI POC

III. Intelligence Information for CVE-2021-47461

请登录查看更多情报信息。

Other References for CVE-2021-47461 (3)

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-2021-47461

No comments yet

Leave a comment