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CVE-2025-21704— usb: cdc-acm: Check control transfer buffer size before access

AI Predicted 7.8 Difficulty: Easy EPSS 0.03% · P7

Affected Version Matrix 18

VendorProductVersion RangeStatus
LinuxLinux1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< a4e1ae5c0533964170197e4fb4f33bc8c1db5cd2affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 90dd2f1b7342b9a671a5ea4160f408037b92b118affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 871619c2b78fdfe05afb4e8ba548678687beb812affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 7828e9363ac4d23b02419bf2a45b9f1d9fb35646affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 6abb510251e75f875797d8983a830e6731fa281caffected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< f64079bef6a8a7823358c3f352ea29a617844636affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 383d516a0ebc8641372b521c8cb717f0f1834831affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< e563b01208f4d1f609bcab13333b6c0e24ce6a01affected
… +10 more rows
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I. Basic Information for CVE-2025-21704

Vulnerability Information
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Vulnerability Title
usb: cdc-acm: Check control transfer buffer size before access
Source: NVD (National Vulnerability Database)
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: usb: cdc-acm: Check control transfer buffer size before access If the first fragment is shorter than struct usb_cdc_notification, we can't calculate an expected_size. Log an error and discard the notification instead of reading lengths from memory outside the received data, which can lead to memory corruption when the expected_size decreases between fragments, causing `expected_size - acm->nb_index` to wrap. This issue has been present since the beginning of git history; however, it only leads to memory corruption since commit ea2583529cd1 ("cdc-acm: reassemble fragmented notifications"). A mitigating factor is that acm_ctrl_irq() can only execute after userspace has opened /dev/ttyACM*; but if ModemManager is running, ModemManager will do that automatically depending on the USB device's vendor/product IDs and its other interfaces.
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usb:cdc-acm模块访问前没有检查传输缓冲区大小。
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ a4e1ae5c0533964170197e4fb4f33bc8c1db5cd2 -
LinuxLinux 2.6.12 -

II. Public POCs for CVE-2025-21704

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III. Intelligence Information for CVE-2025-21704

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Patches & Fixes for CVE-2025-21704 (5)

Vendor Advisories for CVE-2025-21704 (1)

Other References for CVE-2025-21704 (3)

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-21704

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