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CVE-2025-68339— atm/fore200e: Fix possible data race in fore200e_open()

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fore200e_open中available_cell_rate访问未加锁，可能导致数据竞争。

AI Predicted 4.3 Difficulty: Moderate EPSS 0.19% · P8

Possible ATT&CK Techniques 1 AI

T1055 · Process Injection

Affected Version Matrix 16

VendorProduct Version RangeStatus
Linux Linux 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 1b60f42a639999c37da7f1fbfa1ad29cf4cbdd2d affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< bd1415efbab507b9b995918105eef953013449dd affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< ed34c70d88e2b8b9bc6c3ede88751186d6c6d5d1 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 9917ba597cf95f307778e495f71ff25a5064d167 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 667ac868823224374f819500adc5baa2889c7bc5 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 6610361458e7eb6502dd3182f586f91fcc218039 affected
1da177e4c3f41524e886b7f1b8a0c1fc7321cac2< 82fca3d8a4a34667f01ec2351a607135249c9cff affected
2.6.12 affected
… +8 more rows
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I. Basic Information for CVE-2025-68339

Vulnerability Information
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Vulnerability Title
atm/fore200e: Fix possible data race in fore200e_open()
Source: CVE Program / CVE List V5
Vulnerability Description
In the Linux kernel, the following vulnerability has been resolved: atm/fore200e: Fix possible data race in fore200e_open() Protect access to fore200e->available_cell_rate with rate_mtx lock in the error handling path of fore200e_open() to prevent a data race. The field fore200e->available_cell_rate is a shared resource used to track available bandwidth. It is concurrently accessed by fore200e_open(), fore200e_close(), and fore200e_change_qos(). In fore200e_open(), the lock rate_mtx is correctly held when subtracting vcc->qos.txtp.max_pcr from available_cell_rate to reserve bandwidth. However, if the subsequent call to fore200e_activate_vcin() fails, the function restores the reserved bandwidth by adding back to available_cell_rate without holding the lock. This introduces a race condition because available_cell_rate is a global device resource shared across all VCCs. If the error path in fore200e_open() executes concurrently with operations like fore200e_close() or fore200e_change_qos() on other VCCs, a read-modify-write race occurs. Specifically, the error path reads the rate without the lock. If another CPU acquires the lock and modifies the rate (e.g., releasing bandwidth in fore200e_close()) between this read and the subsequent write, the error path will overwrite the concurrent update with a stale value. This results in incorrect bandwidth accounting.
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fore200e_open中available_cell_rate访问未加锁，可能导致数据竞争。
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 1da177e4c3f41524e886b7f1b8a0c1fc7321cac2 ~ 1b60f42a639999c37da7f1fbfa1ad29cf4cbdd2d -
Linux Linux 2.6.12 -

II. Public POCs for CVE-2025-68339

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III. Intelligence Information for CVE-2025-68339

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Same Patch Batch · Linux · 2025-12-23 · 6 CVEs total

CVE-2025-68341 9.8 CRITICAL veth: reduce XDP no_direct return section to fix race
CVE-2025-68340 7.8 HIGH team: Move team device type change at the end of team_port_add
CVE-2025-68343 can: gs_usb: gs_usb_receive_bulk_callback(): check actual_length before accessing header
CVE-2025-68342 can: gs_usb: gs_usb_receive_bulk_callback(): check actual_length before accessing data
CVE-2025-68338 net: dsa: microchip: Don't free uninitialized ksz_irq

IV. Related Vulnerabilities

Same product: Linux
Same vendor: Linux

V. Comments for CVE-2025-68339

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