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National Vulnerability Database

National Vulnerability Database

NVD

National Vulnerability Database
  1. Vulnerabilities

CVE-2026-43203 Detail

Description

In the Linux kernel, the following vulnerability has been resolved: atm: fore200e: fix use-after-free in tasklets during device removal When the PCA-200E or SBA-200E adapter is being detached, the fore200e is deallocated. However, the tx_tasklet or rx_tasklet may still be running or pending, leading to use-after-free bug when the already freed fore200e is accessed again in fore200e_tx_tasklet() or fore200e_rx_tasklet(). One of the race conditions can occur as follows: CPU 0 (cleanup) | CPU 1 (tasklet) fore200e_pca_remove_one() | fore200e_interrupt() fore200e_shutdown() | tasklet_schedule() kfree(fore200e) | fore200e_tx_tasklet() | fore200e-> // UAF Fix this by ensuring tx_tasklet or rx_tasklet is properly canceled before the fore200e is released. Add tasklet_kill() in fore200e_shutdown() to synchronize with any pending or running tasklets. Moreover, since fore200e_reset() could prevent further interrupts or data transfers, the tasklet_kill() should be placed after fore200e_reset() to prevent the tasklet from being rescheduled in fore200e_interrupt(). Finally, it only needs to do tasklet_kill() when the fore200e state is greater than or equal to FORE200E_STATE_IRQ, since tasklets are uninitialized in earlier states. In a word, the tasklet_kill() should be placed in the FORE200E_STATE_IRQ branch within the switch...case structure. This bug was identified through static analysis.


Metrics

 
NVD enrichment efforts reference publicly available information to associate vector strings. CVSS information contributed by other sources is also displayed.
CVSS 4.0 Severity and Vector Strings:

NIST CVSS score
NIST: NVD
N/A
NVD assessment not yet provided.

References to Advisories, Solutions, and Tools

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URL Source(s) Tag(s)
https://git.kernel.org/stable/c/5189368f10903956be05062d160b2804bf5e5016 kernel.org Patch 
https://git.kernel.org/stable/c/73fbc5d1a9ccb626937500bbd67136f077d8237b kernel.org Patch 
https://git.kernel.org/stable/c/8930878101cd40063888a68af73b1b0f8b6c79bc kernel.org Patch 
https://git.kernel.org/stable/c/91f25749aaf57c47ae1e12478144e6ea8c8562f2 kernel.org Patch 
https://git.kernel.org/stable/c/97900f512252a59f23d6ce4ab215cc88fed66e68 kernel.org Patch 
https://git.kernel.org/stable/c/aba0b4bc09376dfc3d53c826514fe38fc8337f52 kernel.org Patch 
https://git.kernel.org/stable/c/e075ec9b08f862dade8011481058f7eb5f716c57 kernel.org Patch 
https://git.kernel.org/stable/c/e4ff4e3ffcf9d5aad380cdd1d8cdc008bb34f97d kernel.org Patch 

Weakness Enumeration

CWE-ID CWE Name Source
CWE-416 Use After Free cwe source acceptance level NIST  

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Change History

3 change records found show changes

Quick Info

CVE Dictionary Entry:
CVE-2026-43203
NVD Published Date:
05/06/2026
NVD Last Modified:
05/11/2026
Source:
kernel.org