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CVE-2021-46904— net: hso: fix null-ptr-deref during tty device unregistration

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tty设备注销期间存在NULL指针取消引用问题。

AI Predicted 7.8 Difficulty: Moderate EPSS 0.26% · P16

Possible ATT&CK Techniques 1 AI

T1200 · Hardware Additions

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux 72dc1c096c7051a48ab1dbb12f71976656b55eb5< a462067d7c8e6953a733bf5ade8db947b1bb5449 affected
72dc1c096c7051a48ab1dbb12f71976656b55eb5< 145c89c441d27696961752bf51b323f347601bee affected
72dc1c096c7051a48ab1dbb12f71976656b55eb5< caf5ac93b3b5d5fac032fc11fbea680e115421b4 affected
72dc1c096c7051a48ab1dbb12f71976656b55eb5< 92028d7a31e55d53e41cff679156b9432cffcb36 affected
72dc1c096c7051a48ab1dbb12f71976656b55eb5< 4a2933c88399c0ebc738db39bbce3ae89786d723 affected
72dc1c096c7051a48ab1dbb12f71976656b55eb5< dc195928d7e4ec7b5cfc6cd10dc4c8d87a7c72ac affected
72dc1c096c7051a48ab1dbb12f71976656b55eb5< 388d05f70f1ee0cac4a2068fd295072f1a44152a affected
72dc1c096c7051a48ab1dbb12f71976656b55eb5< 8a12f8836145ffe37e9c8733dce18c22fb668b66 affected
… +10 more rows
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I. Basic Information for CVE-2021-46904

Vulnerability Information
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Vulnerability Title
net: hso: fix null-ptr-deref during tty device unregistration
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: net: hso: fix null-ptr-deref during tty device unregistration Multiple ttys try to claim the same the minor number causing a double unregistration of the same device. The first unregistration succeeds but the next one results in a null-ptr-deref. The get_free_serial_index() function returns an available minor number but doesn't assign it immediately. The assignment is done by the caller later. But before this assignment, calls to get_free_serial_index() would return the same minor number. Fix this by modifying get_free_serial_index to assign the minor number immediately after one is found to be and rename it to obtain_minor() to better reflect what it does. Similary, rename set_serial_by_index() to release_minor() and modify it to free up the minor number of the given hso_serial. Every obtain_minor() should have corresponding release_minor() call.
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tty设备注销期间存在NULL指针取消引用问题。
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 72dc1c096c7051a48ab1dbb12f71976656b55eb5 ~ a462067d7c8e6953a733bf5ade8db947b1bb5449 -
Linux Linux 2.6.27 -

II. Public POCs for CVE-2021-46904

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III. Intelligence Information for CVE-2021-46904

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Other References for CVE-2021-46904 (8)

Same Patch Batch · Linux · 2024-02-25 · 11 CVEs total

CVE-2023-52469 7.8 HIGH drivers/amd/pm: fix a use-after-free in kv_parse_power_table
CVE-2023-52465 power: supply: Fix null pointer dereference in smb2_probe
CVE-2023-52467 mfd: syscon: Fix null pointer dereference in of_syscon_register()
CVE-2023-52468 class: fix use-after-free in class_register()
CVE-2023-52470 drm/radeon: check the alloc_workqueue return value in radeon_crtc_init()
CVE-2023-52471 ice: Fix some null pointer dereference issues in ice_ptp.c
CVE-2023-52472 crypto: rsa - add a check for allocation failure
CVE-2023-52473 thermal: core: Fix NULL pointer dereference in zone registration error path
CVE-2021-46905 net: hso: fix NULL-deref on disconnect regression
CVE-2022-48626 moxart: fix potential use-after-free on remove path

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2021-46904

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