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CVE-2021-47477— comedi: dt9812: fix DMA buffers on stack

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，该漏洞源于不支持 DMA 的系统上存在堆栈信息泄漏问题。

AI Predicted 5.3 Difficulty: Moderate EPSS 0.72% · P53

Possible ATT&CK Techniques 1 AI

T1059 · Command and Scripting Interpreter

Affected Version Matrix 20

VendorProduct Version RangeStatus
Linux Linux 63274cd7d38a3322d90b66a5bc976de1fb899051< a6af69768d5cb4b2528946d53be5fa19ade37723 affected
63274cd7d38a3322d90b66a5bc976de1fb899051< 365a346cda82f51d835c49136a00a9df8a78c7f2 affected
63274cd7d38a3322d90b66a5bc976de1fb899051< 8a52bc480992c7c9da3ebfea456af731f50a4b97 affected
63274cd7d38a3322d90b66a5bc976de1fb899051< 39ea61037ae78f14fa121228dd962ea3280eacf3 affected
63274cd7d38a3322d90b66a5bc976de1fb899051< 3efb7af8ac437085b6c776e5b54830b149d86efe affected
63274cd7d38a3322d90b66a5bc976de1fb899051< 786f5b03450454557ff858a8bead5d7c0cbf78d6 affected
63274cd7d38a3322d90b66a5bc976de1fb899051< 3ac273d154d634e2034508a14db82a95d7ad12ed affected
63274cd7d38a3322d90b66a5bc976de1fb899051< 20cebb8b620dc987e55ddc46801de986e081757e affected
… +12 more rows
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I. Basic Information for CVE-2021-47477

Vulnerability Information
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Vulnerability Title
comedi: dt9812: fix DMA buffers on stack
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: comedi: dt9812: fix DMA buffers on stack USB transfer buffers are typically mapped for DMA and must not be allocated on the stack or transfers will fail. Allocate proper transfer buffers in the various command helpers and return an error on short transfers instead of acting on random stack data. Note that this also fixes a stack info leak on systems where DMA is not used as 32 bytes are always sent to the device regardless of how short the command is.
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，该漏洞源于不支持 DMA 的系统上存在堆栈信息泄漏问题。
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 63274cd7d38a3322d90b66a5bc976de1fb899051 ~ a6af69768d5cb4b2528946d53be5fa19ade37723 -
Linux Linux 2.6.29 -

II. Public POCs for CVE-2021-47477

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III. Intelligence Information for CVE-2021-47477

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Other References for CVE-2021-47477 (8)

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-2021-47476 comedi: ni_usb6501: fix NULL-deref in command paths
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-2021-47477

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