VulnerabilityPublished 19 Jul 2026Updated 6 Nov 2026

CVE-2026-64054: Linux kernel · net: shaper: reject duplicate leaves in GROUP request

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in a9a2fa1da619f276580b0d4c5d12efac89e8642b : update Linux kernel when convenient.

Data as of 6 Nov 2026, 16:49 UTC

Severity

Unrated

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

Thin evidence

One scorer or none

Exploitation: No evidence of active exploitation and no public proof of concept
Automatable: Attackers cannot reliably automate steps 1–4 of the kill chain
Technical impact: Limited control over the software or limited information exposure

CISA SSVC assessment, 2026-11-06.

Patch

Available – fixed in a9a2fa1da619f276580b0d4c5d12efac89e8642b, 31767bf852b59f05125b58a17007e4cd1ea9eb2e, 5098b223f0f0c5c18a3884a8b0ea5bd4a0c7bd75

Exploitation evidence

Disclosed: evidence found.
CVE published 19 Jul 2026
Detectable: no evidence on record.
No public nuclei template indexed
Weaponized: 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 6 Nov 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.
Weaponized: A Metasploit exploit module or Exploit-DB entry exists (Metasploit scanner modules do not count), 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 Linux kernel to a9a2fa1da619f276580b0d4c5d12efac89e8642b, 31767bf852b59f05125b58a17007e4cd1ea9eb2e or 5098b223f0f0c5c18a3884a8b0ea5bd4a0c7bd75.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ 5d5d4700e75d861e83bf18eb6bf66ff90f85fe4e, < a9a2fa1da619f276580b0d4c5d12efac89e8642b	Fixed in a9a2fa1da619f276580b0d4c5d12efac89e8642b
LinuxLinux	Affected ≥ 5d5d4700e75d861e83bf18eb6bf66ff90f85fe4e, < 31767bf852b59f05125b58a17007e4cd1ea9eb2e	Fixed in 31767bf852b59f05125b58a17007e4cd1ea9eb2e
LinuxLinux	Affected ≥ 5d5d4700e75d861e83bf18eb6bf66ff90f85fe4e, < 5098b223f0f0c5c18a3884a8b0ea5bd4a0c7bd75	Fixed in 5098b223f0f0c5c18a3884a8b0ea5bd4a0c7bd75
LinuxLinux	Affected =6.13	Fixed in–

Description

In the Linux kernel, the following vulnerability has been resolved: net: shaper: reject duplicate leaves in GROUP request net_shaper_nl_group_doit() does not deduplicate NET_SHAPER_A_LEAVES entries. When userspace supplies the same leaf handle twice, the same old-parent pointer lands twice in old_nodes[]. The cleanup loop double frees the parent. Of course the same parent may still be in old_nodes[] twice if we are moving multiple of its leaves. Note that this patch also implicitly fixes the fact that the i >= leaves_count path forgets to set ret.

References

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