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CVE-2021-47649— udmabuf: validate ubuf->pagecount

EPSS 0.01% · P1

Affected Version Matrix 14

VendorProductVersion RangeStatus
LinuxLinuxfbb0de795078190a9834b3409e4b009cfb18a6d4< 5d50f851dd307c07ca5591297093f19967c834a9affected
fbb0de795078190a9834b3409e4b009cfb18a6d4< b267a8118c2b171bf7d67b90ed64154eeab9fae0affected
fbb0de795078190a9834b3409e4b009cfb18a6d4< 811b667cefbea9cb7511a874b169d6a92907137eaffected
fbb0de795078190a9834b3409e4b009cfb18a6d4< a3728d32fc61eb0fe283cb8ff60b2c8f751e2202affected
fbb0de795078190a9834b3409e4b009cfb18a6d4< 9e9b4a269f84d3230f2af84ff42322db676440d9affected
fbb0de795078190a9834b3409e4b009cfb18a6d4< 2b6dd600dd72573c23ea180b5b0b2f1813405882affected
4.20affected
< 4.20unaffected
… +6 more rows
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I. Basic Information for CVE-2021-47649

Vulnerability Information
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Vulnerability Title
udmabuf: validate ubuf->pagecount
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: udmabuf: validate ubuf->pagecount Syzbot has reported GPF in sg_alloc_append_table_from_pages(). The problem was in ubuf->pages == ZERO_PTR. ubuf->pagecount is calculated from arguments passed from user-space. If user creates udmabuf with list.size == 0 then ubuf->pagecount will be also equal to zero; it causes kmalloc_array() to return ZERO_PTR. Fix it by validating ubuf->pagecount before passing it to kmalloc_array().
Source: NVD (National Vulnerability Database)
CVSS Information
N/A
Source: NVD (National Vulnerability Database)
Vulnerability Type
N/A
Source: NVD (National Vulnerability Database)
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，该漏洞源于未验证ubuf->pagecount。
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

VendorProductAffected VersionsCPESubscribe
LinuxLinux fbb0de795078190a9834b3409e4b009cfb18a6d4 ~ 5d50f851dd307c07ca5591297093f19967c834a9 -
LinuxLinux 4.20 -

II. Public POCs for CVE-2021-47649

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III. Intelligence Information for CVE-2021-47649

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Same Patch Batch · Linux · 2025-02-26 · 706 CVEs total

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CVE-2022-49490drm/msm/mdp5: Return error code in mdp5_pipe_release when deadlock is detected
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Showing top 20 of 706 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

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