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CVE-2025-39928— i2c: rtl9300: ensure data length is within supported range

EPSS 0.02% · P6

Affected Version Matrix 6

VendorProductVersion RangeStatus
LinuxLinuxc366be720235301fdadf67e6f1ea6ff32669c074< c91382328fc89f73144d5582f2d8f1dd3e41c8f7affected
c366be720235301fdadf67e6f1ea6ff32669c074< 06418cb5a1a542a003fdb4ad8e76ea542d57cfbaaffected
6.13affected
< 6.13unaffected
6.16.8≤ 6.16.*unaffected
6.17≤ *unaffected
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I. Basic Information for CVE-2025-39928

Vulnerability Information
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Vulnerability Title
i2c: rtl9300: ensure data length is within supported range
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: i2c: rtl9300: ensure data length is within supported range Add an explicit check for the xfer length to 'rtl9300_i2c_config_xfer' to ensure the data length isn't within the supported range. In particular a data length of 0 is not supported by the hardware and causes unintended or destructive behaviour. This limitation becomes obvious when looking at the register documentation [1]. 4 bits are reserved for DATA_WIDTH and the value of these 4 bits is used as N + 1, allowing a data length range of 1 <= len <= 16. Affected by this is the SMBus Quick Operation which works with a data length of 0. Passing 0 as the length causes an underflow of the value due to: (len - 1) & 0xf and effectively specifying a transfer length of 16 via the registers. This causes a 16-byte write operation instead of a Quick Write. For example, on SFP modules without write-protected EEPROM this soft-bricks them by overwriting some initial bytes. For completeness, also add a quirk for the zero length. [1] https://svanheule.net/realtek/longan/register/i2c_mst1_ctrl2
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，该漏洞源于未检查数据长度是否在支持范围内，可能导致整数下溢和意外行为。
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 c366be720235301fdadf67e6f1ea6ff32669c074 ~ c91382328fc89f73144d5582f2d8f1dd3e41c8f7 -
LinuxLinux 6.13 -

II. Public POCs for CVE-2025-39928

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III. Intelligence Information for CVE-2025-39928

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Same Patch Batch · Linux · 2025-10-01 · 169 CVEs total

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CVE-2022-50469staging: rtl8723bs: fix potential memory leak in rtw_init_drv_sw()
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Showing top 20 of 169 CVEs. View all on vendor page &rarr; →

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-39928

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