CVE-2026-43203

HIGH EPSS 34.9%
Published May 6, 20261mo ago · Modified Jun 17, 20261w ago
7.5 CVSS 3.1
High
Find Similar
Published May 6, 2026 1mo ago
Last Modified Jun 17, 2026 1w ago

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.

CVSS Details

Base Score
7.5
Exploitability
1.6
Impact
5.9
Vector string
CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
Attack Vector Network
Attack Complexity High
Privileges Required None
User Interaction Required
Scope Unchanged
Confidentiality High
Integrity High
Availability High

Threat Intelligence

EPSS Exploit Probability
34.9% percentile
Exploit & Patch Status
No Known Exploit
Patch Available

Weaknesses 1

CWE-416 Use After Free Memory Safety

Affected Products 12

VendorProductVersionRange
linuxlinux_kernel*≥2.6.12.1  –  <5.10.252
linuxlinux_kernel*≥5.11  –  <5.15.202
linuxlinux_kernel*≥5.16  –  <6.1.165
linuxlinux_kernel*≥6.2  –  <6.6.128
linuxlinux_kernel*≥6.7  –  <6.12.75
linuxlinux_kernel*≥6.13  –  <6.18.16
linuxlinux_kernel*≥6.19  –  <6.19.6
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any
linuxlinux_kernel2.6.12any

References 8

  • git.kernel.org https://git.kernel.org/stable/c/5189368f10903956be05062d160b2804bf5e5016
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/73fbc5d1a9ccb626937500bbd67136f077d8237b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8930878101cd40063888a68af73b1b0f8b6c79bc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/91f25749aaf57c47ae1e12478144e6ea8c8562f2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/97900f512252a59f23d6ce4ab215cc88fed66e68
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/aba0b4bc09376dfc3d53c826514fe38fc8337f52
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e075ec9b08f862dade8011481058f7eb5f716c57
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e4ff4e3ffcf9d5aad380cdd1d8cdc008bb34f97d
    Patch

Remediation

  • git.kernel.org https://git.kernel.org/stable/c/5189368f10903956be05062d160b2804bf5e5016
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/73fbc5d1a9ccb626937500bbd67136f077d8237b
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/8930878101cd40063888a68af73b1b0f8b6c79bc
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/91f25749aaf57c47ae1e12478144e6ea8c8562f2
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/97900f512252a59f23d6ce4ab215cc88fed66e68
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/aba0b4bc09376dfc3d53c826514fe38fc8337f52
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e075ec9b08f862dade8011481058f7eb5f716c57
    Patch
  • git.kernel.org https://git.kernel.org/stable/c/e4ff4e3ffcf9d5aad380cdd1d8cdc008bb34f97d
    Patch