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CVE-2021-47475— comedi: vmk80xx: fix transfer-buffer overflows

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，该漏洞源于存在缓冲区溢出漏洞。

AI Predicted 6.8 Difficulty: Hard EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1205.001 · Port Knocking

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 985cafccbf9b7f862aa1c5ee566801e18b5161fb< 5229159f1d052821007aff1a1beb7873eacf1a9f affected
985cafccbf9b7f862aa1c5ee566801e18b5161fb< ec85bcff4ed09260243d8f39faba99e1041718ba affected
985cafccbf9b7f862aa1c5ee566801e18b5161fb< 40d2a7e278e2e7c0a5fd7e997e7eb63945bf93f7 affected
985cafccbf9b7f862aa1c5ee566801e18b5161fb< 7a2021b896de1ad559d33b5c5cdd20b982242088 affected
985cafccbf9b7f862aa1c5ee566801e18b5161fb< 199acd8c110e3ae62833c24f632b0bb1c9f012a9 affected
985cafccbf9b7f862aa1c5ee566801e18b5161fb< 33d7a470730dfe7c9bfc8da84575cf2cedd60d00 affected
985cafccbf9b7f862aa1c5ee566801e18b5161fb< 278484ae93297b1bb1ce755f9d3b6d95a48c7d47 affected
985cafccbf9b7f862aa1c5ee566801e18b5161fb< 06ac746d57e6d32b062e220415c607b7e2e0fa50 affected
… +12 more rows
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I. Basic Information for CVE-2021-47475

Vulnerability Information
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Vulnerability Title
comedi: vmk80xx: fix transfer-buffer overflows
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: comedi: vmk80xx: fix transfer-buffer overflows The driver uses endpoint-sized USB transfer buffers but up until recently had no sanity checks on the sizes. Commit e1f13c879a7c ("staging: comedi: check validity of wMaxPacketSize of usb endpoints found") inadvertently fixed NULL-pointer dereferences when accessing the transfer buffers in case a malicious device has a zero wMaxPacketSize. Make sure to allocate buffers large enough to handle also the other accesses that are done without a size check (e.g. byte 18 in vmk80xx_cnt_insn_read() for the VMK8061_MODEL) to avoid writing beyond the buffers, for example, when doing descriptor fuzzing. The original driver was for a low-speed device with 8-byte buffers. Support was later added for a device that uses bulk transfers and is presumably a full-speed device with a maximum 64-byte wMaxPacketSize.
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，该漏洞源于存在缓冲区溢出漏洞。
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 985cafccbf9b7f862aa1c5ee566801e18b5161fb ~ 5229159f1d052821007aff1a1beb7873eacf1a9f -
Linux Linux 2.6.31 -

II. Public POCs for CVE-2021-47475

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III. Intelligence Information for CVE-2021-47475

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Other References for CVE-2021-47475 (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-2021-47475

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