VulnerabilityPublished 19 Jul 2026Updated 6 Nov 2026

CVE-2026-64128: Linux kernel · Bluetooth: ISO: drop ISO_END frames received without prior ISO_START

Affects Linux kernelSource CVE Database V5

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Not known to be exploited · fixed in e3a799881c12d27596232636a607e2e3fa448d63 : 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 e3a799881c12d27596232636a607e2e3fa448d63, 84c24fb151fc1179355296d7ff29129ac7c42129, 61f2410a96dee808029e2ae4d6ef2dd635f3477f +3

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 to a fixed release listed under Affected software.

Affected software

Product	Affected	Fixed in
LinuxLinux	Affected ≥ ccf74f2390d60a2f9a75ef496d2564abb478f46a, < e3a799881c12d27596232636a607e2e3fa448d63	Fixed in e3a799881c12d27596232636a607e2e3fa448d63
LinuxLinux	Affected ≥ ccf74f2390d60a2f9a75ef496d2564abb478f46a, < 84c24fb151fc1179355296d7ff29129ac7c42129	Fixed in 84c24fb151fc1179355296d7ff29129ac7c42129
LinuxLinux	Affected ≥ ccf74f2390d60a2f9a75ef496d2564abb478f46a, < 61f2410a96dee808029e2ae4d6ef2dd635f3477f	Fixed in 61f2410a96dee808029e2ae4d6ef2dd635f3477f
LinuxLinux	Affected ≥ ccf74f2390d60a2f9a75ef496d2564abb478f46a, < 39f4a82e80c8f5ed2d6952d73fbafc895721a728	Fixed in 39f4a82e80c8f5ed2d6952d73fbafc895721a728
LinuxLinux	Affected ≥ ccf74f2390d60a2f9a75ef496d2564abb478f46a, < 3af41ee7ebecb0d5c8a504861f6cfad31345310f	Fixed in 3af41ee7ebecb0d5c8a504861f6cfad31345310f
LinuxLinux	Affected ≥ ccf74f2390d60a2f9a75ef496d2564abb478f46a, < 1c3d1e1696b72579b970e17999c503a14535205b	Fixed in 1c3d1e1696b72579b970e17999c503a14535205b

Description

In the Linux kernel, the following vulnerability has been resolved: Bluetooth: ISO: drop ISO_END frames received without prior ISO_START ISO data PDUs carry a packet-boundary flag indicating START, CONT, END or SINGLE. The ISO_CONT branch of iso_recv() guards against a missing ISO_START by checking conn->rx_len before touching conn->rx_skb, but ISO_END does not. If a peer sends an ISO_END as the first packet on a fresh ISO connection, conn->rx_skb is still NULL and conn->rx_len is zero, so skb_put(conn->rx_skb, ...) dereferences NULL and oopses. For BIS, where receivers sync to a broadcaster without pairing, any broadcaster on the air can trigger this. Mirror the ISO_CONT check at the top of ISO_END so a stray end fragment is logged and dropped instead of crashing the host.

References

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