VulnerabilityPublished 20 Jul 2026Updated 7 Sep 2026

CVE-2026-63982: Linux kernel · net/sched: Fix ethx:ingress -> ethy:egress -> ethx:ingress mirred loop

Affects Linux kernelSource GCVE Database

Not known to be exploited · fixed in 7.0.0-28.28~24.04.1 : update Linux kernel when convenient.

Data as of 26 Oct 2026, 13:47 UTC

Severity

Medium

Rated by Threat Radar · No CVSS score from NVD or the CNA

EPSS: 0.2% chance of exploitation in 30 days – higher than 10% of CVEsExploit Prediction Scoring System: the likelihood attackers will use this flaw soon.
Patch: Available – fixed in 7.0.0-28.28~24.04.1, 7.0.0-28.28, 7.0.0-1008.8 +3

Exploitation evidence

Disclosed: evidence found.
CVE published 20 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponised: no evidence on record.
No public exploit code indexed in Metasploit or Exploit-DB
Exploited in the wildExploited: no evidence on record.
Not in CISA KEV and no source reports exploitation
Observed by OffSeq MirageSeen by Mirage: no evidence on record.
No attack traffic recorded by OffSeq Mirage sensors

A missing step is not evidence of safety. Sources: cve.org (opens in a new tab), the Metasploit, Exploit-DB and nuclei-templates index as of 26 Oct 2026.

Disclosed: The CVE record is public on cve.org. Its publication is t = 0.
Detectable: A public nuclei template can find exposed instances, for defenders and attackers alike.
Weaponised: Public exploit code exists in Metasploit or Exploit-DB, or CISA SSVC or the CVSS exploit maturity reports a public proof of concept.
Exploited in the wild: CISA KEV lists it, CISA SSVC rates exploitation active, or a source reports attacks.
Observed by OffSeq Mirage: OffSeq Mirage honeypot sensors recorded attack traffic for this CVE, or found exposed hosts without attack traffic.

Moments are spaced evenly, not to scale; a dashed line marks a gap of six months or more. Deltas count from t = 0. Sources that give only a date (CISA KEV, Exploit-DB, or a time of exactly 00:00Z) read “same day” rather than hours. Metasploit modules carry the flaw’s disclosure date, not their release date, and nuclei templates carry no date, so both appear above but not on the timeline.

What to do

Upgrade to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
Ubuntu 26.04 LTSlinux`pkg:deb/ubuntu/linux@7.0.0-28.28?arch=source&distro=resolute`Other threats	Affected <7.0.0-28.28	Fixed in 7.0.0-28.28
Ubuntu 26.04 LTSlinux-aws`pkg:deb/ubuntu/linux-aws@7.0.0-1009.9?arch=source&distro=resolute`Other threats	Affected 6.17.0-1002.2 – 7.0.0-1009.9 10 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-azure`pkg:deb/ubuntu/linux-azure@7.0.0-1009.9?arch=source&distro=resolute`Other threats	Affected 6.17.0-1003.3 – 7.0.0-1009.9 10 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-azure-fde`pkg:deb/ubuntu/linux-azure-fde@7.0.0-1008.8?arch=source&distro=resolute`Other threats	Affected 7.0.0-1003.3 – 7.0.0-1008.8 4 affected builds	Fixed in–
Ubuntu 26.04 LTSlinux-gcp`pkg:deb/ubuntu/linux-gcp@7.0.0-1008.8?arch=source&distro=resolute`Other threats	Affected <7.0.0-1008.8	Fixed in 7.0.0-1008.8
Ubuntu 26.04 LTSlinux-gke`pkg:deb/ubuntu/linux-gke@7.0.0-1003.4?arch=source&distro=resolute`Other threats	Affected <7.0.0-1003.4	Fixed in 7.0.0-1003.4

Check your own hosts for these packages with threat-finder (opens in a new tab), our free open-source scanner.

AI-suggested

A patch is available and should be applied to affected Linux kernel versions. The vendor advisory from Ubuntu confirms that this and other kernel vulnerabilities have been fixed. Users should update their Linux kernel to a fixed version to remediate this issue.

Description

A vulnerability in the Linux kernel's network scheduler (net/sched) involving mirred redirect loops has been resolved. The issue occurs when mirred redirects to ingress from either ingress or egress, causing the loop state to be lost due to packet deferral and clearing of the sched_mirred_dev array. This flaw could prevent detection of loops in certain network configurations. The vulnerability affects multiple Linux kernel versions and has been fixed in updated releases.

Impact

This vulnerability could cause the network scheduler to fail to detect mirred redirect loops, potentially leading to network misbehavior or degraded performance in affected systems. There is no indication of direct privilege escalation or remote code execution. No known exploits are reported in the wild.

Summary

The Linux kernel vulnerability CVE-2026-63982 concerns the net/sched subsystem where a mirred redirect loop from ethx ingress to ethy egress back to ethx ingress causes the loop state to be lost. This happens because the packet is deferred into the backlog and the sched_mirred_dev array is cleared, preventing detection of the loop. A test case involves configuring mirred filters to redirect packets between interfaces in a loop and attempting a ping. The issue has been addressed in kernel updates.

References

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Exploitation evidence

What to do

Affected software

Description

AI analysisMachine-generated, updated 25 Oct 2026, 13:00 UTC

Technical details

References

Community reviews

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