CVE-2026-43203: In the Linux kernel, the following vulnerability has been resolved: atm: fore200e: fix use-after-free in task

Q: How do I fix CVE-2026-43203?

linux kernel: upgrade to 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.16, 6.19.6. Exact commands for each OS are on this page.

Q: Is CVE-2026-43203 being exploited?

CVE-2026-43203 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

Q: What does CVE-2026-43203 affect?

CVE-2026-43203 affects linux kernel. Severity is high (CVSS 7.5). 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_

Q: How urgent is CVE-2026-43203?

Priority 40/100. High severity; On your watchlist

This month

HIGH 7.5WATCHLISTUPGRADE

CVE-2026-43203 is a high-severity flaw (CVSS 7.5) affecting linux kernel. Below: why it ranks where it does, which versions are affected, what to do, and the exact commands.

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 conditi

Why this priority

High severity
On your watchlist

A fixed release or distro patch exists.

Risk facts

CVSS score	7.5 (High)
Attack vector	Network (remote)
Attack complexity	High
Privileges needed	None
User interaction	Required
EPSS exploit chance	0.4% (top 66%)
CISA exploited list	No
Weakness	CWE-416
Published	2026-05-06
Last modified	2026-06-17

Publisher (CNA): kernel.org · Vendor: linux

Last updated 2026-06-17 · Sources: CVE Program, NVD, CISA KEV, EPSS and vendor advisories · How we score

Am I affected?

Timeline

2026-05-06 12:16 UTCPublished CVE record published
2026-06-17 10:49 UTCUpdated Record last modified

linux linux kernel UPGRADE

Affected: >= 2.6.12.1 and < 5.10.252 · >= 5.11 and < 5.15.202 · >= 5.16 and < 6.1.165 · >= 6.2 and < 6.6.128 · >= 6.7 and < 6.12.75 · >= 6.13 and < 6.18.16 · >= 6.19 and < 6.19.6 · 2.6.12

Fixed in: 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.16, 6.19.6

Safe to downgrade to: no unaffected older release

Check your OS release

cat /etc/os-release; uname -r

Debian / Ubuntu

sudo apt update && sudo apt full-upgrade

RHEL / Amazon Linux / Fedora

sudo dnf upgrade --refresh

Windows

Install the latest cumulative update from Windows Update

If no patch exists yet

OS downgrades are not safe. Apply the vendor mitigation from the advisory and restrict exposure.

Verify at the official source NVD · CVE Program · Report a problem with this page
Scores and fixes here are computed automatically from those and other public sources. Confirm with the vendor advisory before changing production systems.

Quick answers

How do I fix CVE-2026-43203?

linux kernel: upgrade to 5.10.252, 5.15.202, 6.1.165, 6.6.128, 6.12.75, 6.18.16, 6.19.6. Exact commands for each OS are on this page.

Is CVE-2026-43203 being exploited?

CVE-2026-43203 is not on the CISA Known Exploited Vulnerabilities list at the time of the last update. Check again, as this can change.

What does CVE-2026-43203 affect?

CVE-2026-43203 affects linux kernel. Severity is high (CVSS 7.5). 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_

How urgent is CVE-2026-43203?

Priority 40/100. High severity; On your watchlist

Software pages

Linux kernel vulnerabilities

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References

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