🛡️ CVE-2026-43203 — kernel

🟠 CVSS 7.5 — High ✅ No Known Exploit NVD
7.5
CVSS Score
0 Low4 Medium7 High9 Critical10

Description

atm: fore200e: fix use-after-free in tasklets during device removal

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.

How this vulnerability can be exploited

This issue can be reached over the network, attack complexity is high, an attacker needs no privileges on the target. A user must be tricked into taking some action. The scope is unchanged, so the impact stays within the vulnerable component. Rated impact: confidentiality high, integrity high, availability high.

Affected software

CVE-2026-43203 is recorded against 3 packages.

  • kernel (from 6.19.0 up to 6.19.6)
  • linux-kernel
  • unknown

Timeline and source

Published on 6 May 2026 and last revised on 6 August 2026. No public exploit is currently recorded for this entry. A vendor advisory or fix has been published. Record sourced from NVD.

References

git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
git.kernel.org (Web)
github.com (Advisory)
nvd.nist.gov (Advisory)
git.kernel.org (Package)

CVE-2026-43203 on other distributions

Each distribution ships its own build and its own fixed version. Pick the one you run:

Details

Severity High
CVSS Score 7.5
CVSS Vector CVSS:3.1/AV:N/AC:H/PR:N/UI:R/S:U/C:H/I:H/A:H
CWE N/A
Public Exploit ✅ No
Source NVD
Published 2026-05-06
Updated 2026-08-12
Modified 2026-08-06

Affected Packages

Software From version Fixed in
kernel 6.19.0 6.19.6
linux-kernel — —
unknown — —

References

Similar Threats

Site Security Check

Is kernel part of your stack?

CVE-2026-43203 is rated CVSS 7.5 High. BotEraser scans your installation against known CVE records and tells you whether this vulnerability applies to the versions you actually run.

Scan My Site Free →

No credit card required  ·  Results in minutes

ⓘ Data Notice: The information presented above has been compiled from publicly available internet sources. Boteraser aggregates this data solely for informational purposes and does not independently classify, evaluate, or endorse any findings about the vulnerabilities listed. The accuracy and completeness of this information is the sole responsibility of the original publishers. Boteraser and its operators accept no liability for any decisions made based on this data.