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CVE-2025-40106— comedi: fix divide-by-zero in comedi_buf_munge()

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，该漏洞源于未检查chanlist_len是否为零，可能导致除零错误。

AI Predicted 5.5 Difficulty: Moderate EPSS 0.21% · P11

Affected Version Matrix 18

VendorProduct Version RangeStatus
Linux Linux ed9eccbe8970f6eedc1b978c157caf1251a896d4< 4ffea48c69cb2b96a281cb7e5e42d706996631db affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< 8f3e4cd9be4b47246ea73ce5e3e0fa2f57f0d10c affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< 2670932f2465793fea1ef073e40883e8390fa4d9 affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< 6db19822512396be1a3e1e20c16c97270285ba1a affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< d4854eff25efb06d0d84c13e7129bbdba4125f8c affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< a4bb5d1bc2f238461bcbe5303eb500466690bb2c affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< 55520f65fd447e04099a2c44185453c18ea73b7e affected
ed9eccbe8970f6eedc1b978c157caf1251a896d4< 87b318ba81dda2ee7b603f4f6c55e78ec3e95974 affected
… +10 more rows
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I. Basic Information for CVE-2025-40106

Vulnerability Information
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Vulnerability Title
comedi: fix divide-by-zero in comedi_buf_munge()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: comedi: fix divide-by-zero in comedi_buf_munge() The comedi_buf_munge() function performs a modulo operation `async->munge_chan %= async->cmd.chanlist_len` without first checking if chanlist_len is zero. If a user program submits a command with chanlist_len set to zero, this causes a divide-by-zero error when the device processes data in the interrupt handler path. Add a check for zero chanlist_len at the beginning of the function, similar to the existing checks for !map and CMDF_RAWDATA flag. When chanlist_len is zero, update munge_count and return early, indicating the data was handled without munging. This prevents potential kernel panics from malformed user commands.
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，该漏洞源于未检查chanlist_len是否为零，可能导致除零错误。
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 ed9eccbe8970f6eedc1b978c157caf1251a896d4 ~ 4ffea48c69cb2b96a281cb7e5e42d706996631db -
Linux Linux 2.6.29 -

II. Public POCs for CVE-2025-40106

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III. Intelligence Information for CVE-2025-40106

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IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-40106

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