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CVE-2021-47476— comedi: ni_usb6501: fix NULL-deref in command paths

Quick assessment

Affected
Linux Linux
Exploitation
No confirmed in-the-wild exploitation; assess based on exposure
Recommended action
Check the vendor advisory and references for a fixed version. If immediate upgrade is impossible, restrict exposure and increase monitoring.

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，该漏洞源于零大小指针取消引用。

AI Predicted 4.4 Difficulty: Moderate EPSS 0.39% · P31

Possible ATT&CK Techniques 1 AI

T1206

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux a03bb00e50ab4c07107da58a52a0bff7943f360c< 58478143771b20ab219937b1c30a706590a59224 affected
a03bb00e50ab4c07107da58a52a0bff7943f360c< aa39738423503825625853b643b9e99d11c23816 affected
a03bb00e50ab4c07107da58a52a0bff7943f360c< df7b1238f3b599a0b9284249772cdfd1ea83a632 affected
a03bb00e50ab4c07107da58a52a0bff7943f360c< bc51111bf6e8e7b6cc94b133e4c291273a16acd1 affected
a03bb00e50ab4c07107da58a52a0bff7943f360c< b0156b7c9649d8f55a2ce3d3258509f1b2a181c3 affected
a03bb00e50ab4c07107da58a52a0bff7943f360c< ef143dc0c3defe56730ecd3a9de7b3e1d7e557c1 affected
a03bb00e50ab4c07107da58a52a0bff7943f360c< 4a9d43cb5d5f39fa39fc1da438517004cc95f7ea affected
a03bb00e50ab4c07107da58a52a0bff7943f360c< d6a727a681a39ae4f73081a9bedb45d14f95bdd1 affected
… +12 more rows
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I. Basic Information for CVE-2021-47476

Vulnerability Information
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Vulnerability Title
comedi: ni_usb6501: fix NULL-deref in command paths
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: comedi: ni_usb6501: fix NULL-deref in command paths The driver uses endpoint-sized USB transfer buffers but had no sanity checks on the sizes. This can lead to zero-size-pointer dereferences or overflowed transfer buffers in ni6501_port_command() and ni6501_counter_command() if a (malicious) device has smaller max-packet sizes than expected (or when doing descriptor fuzz testing). Add the missing sanity checks to probe().
Source: CVE Program / CVE List V5
CVSS Information
N/A
Source: CVE Program / CVE List V5
Vulnerability Type
N/A
Source: CVE Program / CVE List V5
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，该漏洞源于零大小指针取消引用。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux a03bb00e50ab4c07107da58a52a0bff7943f360c ~ 58478143771b20ab219937b1c30a706590a59224 -
Linux Linux 3.18 -

II. Public POCs for CVE-2021-47476

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III. Intelligence Information for CVE-2021-47476

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Other References for CVE-2021-47476 (9)

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

CVE-2021-47496 9.8 CRITICAL net/tls: Fix flipped sign in tls_err_abort() calls
CVE-2021-47478 9.1 CRITICAL isofs: Fix out of bound access for corrupted isofs image
CVE-2021-47450 8.8 HIGH KVM: arm64: Fix host stage-2 PGD refcount
CVE-2021-47433 8.1 HIGH btrfs: fix abort logic in btrfs_replace_file_extents
CVE-2021-47451 7.8 HIGH netfilter: xt_IDLETIMER: fix panic that occurs when timer_type has garbage value
CVE-2021-47459 7.8 HIGH can: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv
CVE-2021-47483 7.8 HIGH regmap: Fix possible double-free in regcache_rbtree_exit()
CVE-2021-47461 7.8 HIGH userfaultfd: fix a race between writeprotect and exit_mmap()
CVE-2021-47494 7.8 HIGH cfg80211: fix management registrations locking
CVE-2021-47493 7.8 HIGH ocfs2: fix race between searching chunks and release journal_head from buffer_head
CVE-2021-47492 7.8 HIGH mm, thp: bail out early in collapse_file for writeback page
CVE-2021-47485 7.8 HIGH IB/qib: Protect from buffer overflow in struct qib_user_sdma_pkt fields
CVE-2021-47446 7.8 HIGH drm/msm/a4xx: fix error handling in a4xx_gpu_init()
CVE-2021-47447 7.8 HIGH drm/msm/a3xx: fix error handling in a3xx_gpu_init()
CVE-2021-47448 7.5 HIGH mptcp: fix possible stall on recvmsg()
CVE-2021-47458 7.1 HIGH ocfs2: mount fails with buffer overflow in strlen
CVE-2021-47465 7.1 HIGH KVM: PPC: Book3S HV: Fix stack handling in idle_kvm_start_guest()
CVE-2021-47438 7.1 HIGH net/mlx5e: Fix memory leak in mlx5_core_destroy_cq() error path
CVE-2021-47477 comedi: dt9812: fix DMA buffers on stack
CVE-2021-47474 comedi: vmk80xx: fix bulk-buffer overflow

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-2021-47476

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