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CVE-2021-47434— xhci: Fix command ring pointer corruption while aborting a command

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，该漏洞源于在中止命令时命令环指针损坏。

AI Predicted 3.7 Difficulty: Moderate EPSS 0.24% · P14

Possible ATT&CK Techniques 1 AI

T1068 · Exploitation for Privilege Escalation

Affected Version Matrix 24

VendorProduct Version RangeStatus
Linux Linux b92cc66c047ff7cf587b318fe377061a353c120f< 22bcb65ea41072ab5d03c0c6290e04e0df6d09a0 affected
b92cc66c047ff7cf587b318fe377061a353c120f< 62c182b5e763e5f4062e72678e72ce3e02dd4d1b affected
b92cc66c047ff7cf587b318fe377061a353c120f< 01c2dcb67e71c351006dd17cbba86c26b7f61eaf affected
b92cc66c047ff7cf587b318fe377061a353c120f< dec944bb7079b37968cf69c8a438f91f15c4cc61 affected
b92cc66c047ff7cf587b318fe377061a353c120f< e54abefe703ab7c4e5983e889babd1447738ca42 affected
b92cc66c047ff7cf587b318fe377061a353c120f< ff0e50d3564f33b7f4b35cadeabd951d66cfc570 affected
bc47204b268516ae4085ebdc81a34ddda71b77c4 affected
88bd928daafb5912c269af628b1e5347620c9a62 affected
… +16 more rows
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I. Basic Information for CVE-2021-47434

Vulnerability Information
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Vulnerability Title
xhci: Fix command ring pointer corruption while aborting a command
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: xhci: Fix command ring pointer corruption while aborting a command The command ring pointer is located at [6:63] bits of the command ring control register (CRCR). All the control bits like command stop, abort are located at [0:3] bits. While aborting a command, we read the CRCR and set the abort bit and write to the CRCR. The read will always give command ring pointer as all zeros. So we essentially write only the control bits. Since we split the 64 bit write into two 32 bit writes, there is a possibility of xHC command ring stopped before the upper dword (all zeros) is written. If that happens, xHC updates the upper dword of its internal command ring pointer with all zeros. Next time, when the command ring is restarted, we see xHC memory access failures. Fix this issue by only writing to the lower dword of CRCR where all control bits are located.
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，该漏洞源于在中止命令时命令环指针损坏。
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

Vendor Product Affected Versions CPE Subscribe
Linux Linux b92cc66c047ff7cf587b318fe377061a353c120f ~ 22bcb65ea41072ab5d03c0c6290e04e0df6d09a0 -
Linux Linux 3.7 -

II. Public POCs for CVE-2021-47434

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III. Intelligence Information for CVE-2021-47434

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Other References for CVE-2021-47434 (5)

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-2021-47446 7.8 HIGH drm/msm/a4xx: fix error handling in a4xx_gpu_init()
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-2021-47459 7.8 HIGH can: j1939: j1939_netdev_start(): fix UAF for rx_kref of j1939_priv
CVE-2021-47447 7.8 HIGH drm/msm/a3xx: fix error handling in a3xx_gpu_init()
CVE-2021-47451 7.8 HIGH netfilter: xt_IDLETIMER: fix panic that occurs when timer_type has garbage value
CVE-2021-47485 7.8 HIGH IB/qib: Protect from buffer overflow in struct qib_user_sdma_pkt fields
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-2021-47448 7.5 HIGH mptcp: fix possible stall on recvmsg()
CVE-2021-47438 7.1 HIGH net/mlx5e: Fix memory leak in mlx5_core_destroy_cq() error path
CVE-2021-47465 7.1 HIGH KVM: PPC: Book3S HV: Fix stack handling in idle_kvm_start_guest()
CVE-2021-47458 7.1 HIGH ocfs2: mount fails with buffer overflow in strlen
CVE-2021-47479 staging: rtl8712: fix use-after-free in rtl8712_dl_fw
CVE-2024-36010 igb: Fix string truncation warnings in igb_set_fw_version

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-2021-47434

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